EP4617449A1

EP4617449A1 - Roof window with a vacuum insulated glass unit comprising a projecting glass sheet portion at roof window bottom

Info

Publication number: EP4617449A1
Application number: EP24163501.0A
Authority: EP
Inventors: Asbjørn Skyum BLICHFELDT; David Damm MØNSTED; Carsten Thomsen; Martin Schwartz WIIG; Jens Troels Plesner Kristensen; Rasmus Ringsholt Nielsen; Peter Hartwell; Jimmy Skjold Jensen; Claus Hansesgaard; Lars Erdmann; Victor SILBERMANN
Original assignee: VKR Holding AS
Current assignee: VKR Holding AS
Priority date: 2024-03-14
Filing date: 2024-03-14
Publication date: 2025-09-17

Abstract

The present disclosure relates to a roof window for installation in a building roof structure (50). The roof window comprises a frame (2, 2a, 2b), and a vacuum insulated glass unit (3) supported by the frame (2). The vacuum insulated glass unit (3) comprises an exterior glass sheet (EGS, 3a, 3d) comprising an exterior major surface (3a2, 3d2) configured to face towards the exterior (EXT) of the building. The exterior glass sheet (3a, 3d, EGS) comprises a projecting glass sheet portion (3p1) which projects beyond a bottom edge (3b_be) of the second glass sheet (3b) with a projecting distance (DIS1). The projecting glass sheet portion (3p1) overlaps one or more structural bottom profiles (2a_bo, 2b_bo) of the frame (2, 2a, 2b). The vacuum insulated glass unit (3) comprises a lamination layer (6, 3c).

Description

The present disclosure relates to a roof window.

Background

Building roof windows provides several advantages related to e.g. inflow of sunlight to the interior of the building. Also it may provide ventilation advantages. It is however desired that the roof window provides good heat insulation in order to e.g. reduce energy waste. Various roof window solutions have this been developed to obtain this. For example, it is know to provide insulation in the roof window frame in order to increase heat insulation performance. Also, an insulating glass unit comprising multiple gas insulated gaps may be used in order to increase heat insulation performance.
Some patent documents also discloses using vacuum insulated glass (VIG) units in a roof window. For example, patent document EP4242396 A1 disclosing an exterior VIG unit and a smaller interior glass sheet. Patent document EP1835120 A1 discloses a roof window with an adjustable rabbet and a VIG unit. Patent document WO2020147909 A1 discloses a solution where a VIG unit comprises an overlapping part so that an evacuated gap overlaps an elongated, structural bottom member of a sash.
The present disclosure may provide a solution which obtains advantages in relation to e.g. reducing carbon footprint, providing an aesthetically appealing solution, and/or providing a more mechanically simple and/or robust roof window. It may also provide advantages in relation to adaptability.

Summary

The present disclosure relates to a roof window for installation in a roof structure of a building. The roof window comprises a frame and a vacuum insulated glass unit. The vacuum insulated glass unit is supported by the frame. The vacuum insulated glass unit comprises a first glass sheet and a second, glass sheet. An insulating, evacuated gap is placed between the first glass sheet and the second glass sheet. a plurality of support structures are distributed in the evacuated gap so as to maintain a distance between a first major surface of the first glass sheet facing towards the evacuated gap and a first major surface of the second glass sheet facing towards the evacuated gap. An edge seal encloses the evacuated gap. The first glass sheet is configured to be placed closer to the exterior of the building than the second glass sheet when the roof window is installed in a building roof structure. The vacuum insulated glass unit comprises an exterior glass sheet comprising an exterior major surface configured to face towards the exterior of the building.
The exterior glass sheet comprises a first projecting glass sheet portion which projects beyond a bottom edge of the second glass sheet with a first projecting distance. The first projecting glass sheet portion may overlap one or more structural bottom profiles of the frame.
The vacuum insulated glass unit may comprise a lamination layer.
The present disclosure provides a solution that enables providing a roof window with good heat insulation performance and enabling providing appealing aesthetic. The first projecting glass sheet portion enables an increased overlap at the bottom of the frame which enables providing a larger, visible exterior glass sheet surface.
The present disclosure may additionally enable providing a reduced carbon foot print and/or water tightening advantages.
A VIG unit differs from a regular insulated glass unit (IGU) due to the atmospheric pressure of 10 tons/m2 affecting the VIG unit. Further a VIG hermetic edge seal does not have the flexible toughness of regular IGU seals. These among other factors require different design considerations to make a reliable roof window.
The lamination layer provides strength and stiffness to the vacuum insulated glass unit which may be exposed to the atmospheric pressure of 10 tons/m2 and undergoes lateral gravity pull since it is a roof window. Even more so when it snows and a snow load rests on the glass.. The atmospheric pressure of 10 tons/m2 makes the two VIG unit glass panes transfer forces between each other so the lamination layer provides stiffness to both the inner VIG glass pane and to the outer VIG glass pane. Further, the lamination layer can reduce the number of falling parts in case of glass unit breakage and/or extend the time (e.g. during fire) before the unit fails.
In one or more embodiments of the present disclosure, the frame may comprise a movable frame and a fixation frame. The movable frame is configured to move, such as pivot, relative to the fixation frame by means of one or more hinges. The vacuum insulated glass unit is attached to the movable frame and is configured to move together with the movable frame.
In one or more embodiments of the present disclosure, the hinges may provide a rotation axis for the movable frame that is arranged between the top and bottom profiles and is substantially parallel to the longitudinal direction of the top and bottom profiles.
The rotation axis RAX may be substantially horizontal after roof window installation.
This may e.g. provide enhanced ventilation options since the movable frame can be opened from a closed position to an open position. It may moreover provide emergency escape possibilities.
In one or more embodiments of the present disclosure, the roof window may be a roof window of the centre hung type.
Roof windows of the centre hung type may e.g. provide the advantage of enabling rotation of the movable frame so that the exterior surface of the glass unit at least partly faces the building interior during window wash and thereby is more easy to clean from the inside of the building.
In one or more embodiments of the present disclosure, the movable frame may comprise a first structural bottom profile, and the fixation frame may comprise a further structural bottom profile. In some embodiments, the exterior glass sheet, such as comprising at least a part of the projecting glass sheet portion, may partly or fully overlap the full width of the first structural bottom profile.
In some further embodiments of the present disclosure, the first projecting glass sheet portion partly or fully overlaps the width of the further structural bottom profile.
This may e.g. help to provide water tightening advantages and/or enable providing an aesthetical appealing solution.
In one or more embodiments of the present disclosure, the lamination layer may comprise a lamination interlayer and a lamination glass sheet.
This may e.g. provide a strong, stiffening and/or wear resistant solution.
In some embodiments of the present disclosure, the lamination interlayer may comprise or consist of one or more of the following:

ethylene vinyl acetate (EVA),
polyisobutylene (PIB),
polyacetals such as polyvinyl butyral (PVB),
transparent polyurethane (PU),
thermoplastic polyurethane (TPU),
polyvinyl chloride (PVC),
polyesters,
cyclo olefin polymers (COP),
ionomers and/or an ultraviolet activated adhesives.

In some embodiments, PVB, EVA or TPU may be used for the lamination interlayer.
This may e.g. provide enhanced safety. The lamination layer, such as the lamination interlayer and/or the lamination glass sheet, may overlap the movable frame. This may help to carry glass sheet fractions if a glass sheet is broken. The lamination glass sheet may be a lamination glass sheet that may e.g. provide mechanical protection.
In one or more embodiments of the present disclosure, the lamination layer may comprise a lamination interlayer. The lamination interlayer may have a thickness above 0.5 mm, such as above 0.7 mm, such as above 1 mm or above 1.4 mm.
The inventors have found that a thicker lamination layer having a thickness above 0.5 mm, such as above 0.7 mm, such as above 1 mm or above 1.4 mm may provide a stronger glass unit than provided by e.g. a 0.38 mm or 0.4 mm lamination interlayer.
This lamination interlayer thickness may additionally or alternatively be advantageous if it is used for adhering to a thermally tempered glass sheet, due to e.g. surface unevenness, such as so called roller waves, of the thermally tempered glass sheet
The lamination interlayer with such a thickness may e.g. also help to reduce rain noise which may be especially relevant in roof windows. Moreover, VIG units have shown signs of being rather loud/ less noise damping within certain frequencies detectable by humans when subjected to rain, such as heavy rain. The lamination interlayer thickness may help to reduce such noise.
In some embodiments, the lamination interlayer has a thickness between 0.5 mm and 4 mm, such as between 0.6 mm and 3 mm, such as between 0.7 mm and 2 mm..
In one or more embodiments of the present disclosure, said first glass sheet is configured to be said exterior glass sheet. In one or more embodiments of the present disclosure, said first major surface of the first glass sheet may be configured to face towards the interior of the building when the roof window is installed in a building roof structure.
This may provide good heat insulation since the evacuated gap is hence proximate, such as abutting, the first glass sheet.
In one or more embodiments of the present disclosure, the first glass sheet is configured to be the exterior/outermost glass sheet of the vacuum insulation glass unit, and a second major surface of the first glass sheet is configured to face away from the evacuated gap and towards the exterior of the building when the roof window is installed in the building. In some further embodiments hereof, the second major surface of the first glass sheet may be configured to abut the exterior of the building.
In one or more embodiments of the present disclosure, the first projecting glass sheet portion may project with the first projecting distance beyond a bottom edge of a glass sheet of the vacuum insulated glass unit which is adjacent to the exterior glass sheet of the vacuum insulated glass unit.
This may e.g. provide a solution providing reduced carbon footprint while enabling providing a larger visible surface at the roof window bottom part.
In one or more embodiments of the present disclosure, one or more glass sheets arranged between the exterior glass sheet and the lamination layer comprises a second projecting glass sheet portion. The second projecting glass sheet portion projects beyond an edge of the lamination layer.
This may e.g. help to provide reduced carbon footprint, improve cost efficiency. Additionally or alternatively, it may provide more space for e.g. sealing gaskets, heat insulation, a deflection space for handling thermal expansion of the glass unit and/or the like.
The second projecting glass sheet portion projects beyond an edge of the lamination layer at one or more of the sides, top and/or bottom, of the roof window.
In one or more embodiments of the present disclosure, the second projecting glass sheet portion projects beyond a bottom edge of the lamination interlayer at the bottom (BO) of the roof window.
In one or more embodiments of the present disclosure, the second projecting glass sheet portion projects beyond the lamination glass sheet, such as projects beyond a bottom edge of the lamination glass sheet, at e.g. the bottom of the roof window.
It is generally understood that the lamination interlayer and/or the lamination glass sheet may overlap a bottom frame profile of the frame.
In one or more embodiments of the present disclosure, the vacuum insulated glass unit may comprise a protection sealing. The protection sealing may cover the edge seal, such as a solder edge seal, such as a glass solder edge seal or metal solder edge seal, enclosing the evacuated gap.
The first glass sheet may overlap the protection sealing.
In some embodiments, the protection sealing may be a resilient, water tightening sealing.
The protection sealing may help to protect the edge seal, such as a solder edge seal, such as a glass solder edge seal or metal solder edge seal that enclosed the evacuated gap. The edge seal provides hermetic seal of the evacuated gap. However, the edge seal may be rigid and may not be sufficiently able to withstand the environmental conditions subjected at a roof window over the window lifetime. For example water may cause increased wear of the edge seal. For example, phase transition of water, e.g. between solid state and liquid state, may cause increased wear. Providing a protection sealing, such as e.g. an adhesive protection sealing and/or a water tight protection sealing, and providing further protection of this protection sealing by means of the overlapping first glass sheet, may help to provide more weather resistant and/or longer lasting solution.
The protection sealing may in some embodiments extend around the outer boundary of the edge seal of the entire glass sheet and provide protection thereof.
In some embodiments of the present disclosure, the first major surface of the first glass sheet and the first major surface of the second glass sheet may cover the full width of the edge seal. This may provide a stronger and/or more cost efficient solution.
In one or more embodiments of the present disclosure, the vacuum insulated glass unit comprises an enamel layer. The enamel layer covers, such as is applied to, a surface of the first projecting glass sheet portion. In some embodiments, said covered surface is part of the major surface of the exterior glass sheet configured to face towards the interior of the building when the roof window is installed in a building roof structure.
This may provide an aesthetically advantageous solution. The enamel layer may be visible through the first glass sheet from the outside/exterior of the roof window.
The enamel layer may or may not be substantially opaque to at least visible light. The enamel layer may be partly or fully opaque to at least visible light.
In one or more embodiments of the present disclosure, the enamel layer may extend into the evacuated gap. This may help to provide a larger hiding surface provided by the enamel that may hide the edge seal, hide one or more parts of the roof window that is overlapped by the vacuum insulated glass unit, and/or the like.
In one or more embodiments of the present disclosure, the enamel layer extends in between the first glass sheet and the edge seal. In one or more embodiments of the present disclosure, the edge seal may be placed between the enamel layer and the second glass sheet.
In one or more embodiments of the present disclosure, the edge seal, such as the edge seal material, may abut the enamel layer.
It is generally understood that the edge seal that encloses the evacuated gap may comprise a rigid edge seal such as a solder edge seal, such as a glass solder edge seal or a metal solder edge seal.
Experiments have shown that a solder edge seal material such as a solder glass edge seal material may adhere/attach to the enamel and provide a sufficiently strong VIG unit that may withstand thermal expansion of the first and/or second glass sheet.
In one or more embodiments of the present disclosure, the enamel layer covers a major surface of the first projecting glass sheet portion so as to hide one or more parts of the roof widow.
In one or more embodiments of the present disclosure, the enamel layer covers substantially an entire major surface of the first projecting glass sheet portion.
In one or more embodiments of the present disclosure, one or more low-e coatings is/are arranged at said adjacent glass sheet at a major surface of the adjacent glass sheet facing towards the evacuated insulating gap.
This may e.g. provide a solution that may provide enhanced heat management, such as heat insulation, features.
In one or more embodiments of the present disclosure, the roof window comprises one or more step supports configured to support the first projecting glass sheet portion.
Experiments have shown that a linger projecting glass sheet portion may tend to be fragile to exterior forces, such as e.g. hails. Also even if it is a thermally tempered glass sheet comprising the projection. The support may help to support and take up forces, such as impact forces. The support may be configured to transfer impact forces to the frame. Hence, e.g. a more resistant solution may be obtained.
This transfer of forces may be provided directly from the first projecting glass sheet portion and to the frame, through the step support.
The step support may act as a reinforcement/protection of the first projecting glass sheet portion.
In one or more embodiments of the present disclosure, the one or more step supports may be attached to the frame, such as by means of a connection member such as a bracket.
In one or more embodiments of the present disclosure, one or more of the one or more step supports is/are attached to a bottom profile of the movable frame.
This may e.g. provide a stronger and/or more safe solution. Here, the movable frame may provide the supporting of the first projecting glass sheet portion, and forces, such as impact forces from for example hails or other objects, acting on the first projecting glass sheet portion may be transferred to the frame, such as the bottom profile of the movable frame, directly and not through other parts of the glass unit.
In one or more embodiments of the present disclosure, one or more of the one or more step supports comprises a body part which extends to, and/or is placed opposite to, a position opposite a surface of a bottom profile of the fixation frame facing the first projecting glass sheet portion.
This may e.g. provide a more safe solution.
A member, such as a profile member, comprising the step support may e.g., in embodiments of the present disclosure, comprise one or more bends in order to provide a desired cross sectional shape of the member.
A member, such as a profile member, comprising the step support may e.g., in embodiments of the present disclosure, be shaped by roller shaping, extrusion and/or pultrusion.
A member, such as a profile member, comprising the step support may e.g., in embodiments of the present disclosure comprise a sheet, such as a metal sheet. This may e.g. provide a cost efficient and/or space saving solution.
The sheet comprising the step support 15 may in some embodiments have a thickness between 0.2 mm and 1.5 mm, such as between 0.2 mm and 1.2 mm, such as between 0.3 mm and 0.9 mm. This may enable sufficient support of the portion and/e.g. provide a cost efficient and/or space saving solution.
In one or more embodiments of the present disclosure, one or more of the one or more step supports is placed between the first projecting glass sheet portion and a surface of one or more bottom profiles facing the first projecting glass sheet portion.
In one or more embodiments of the present disclosure, wherein the one or more step supports is/are configured to support the first projecting glass sheet portion at one or more locations arranged with a distance of at least 10%, such as at least 40%, such as at least 60% of the first projecting distance from the bottom edge of the second glass sheet.
In one or more embodiments of the present disclosure, one or more of the one or more step supports may be configured to support the first projecting glass sheet portion at least when the movable frame is in a closed position.
In one or more embodiments of the present disclosure, one or more of the one or more step supports may be attached to the first projecting glass sheet portion, such as by means of one or more an adhesives. In one or more embodiments of the present disclosure, said adhesive may comprise an adhesive tape and/or a glue.
This may e.g. provide a safe solution as the support may hence both support the glass sheet so as to reduce the risk of breakage of the first projecting glass sheet portion, and moreover may retain the broken parts of the first projecting glass sheet portion in case it breaks.
Using an adhesive may provide a safe solution. Providing a combination of using a tape and a glue may provide advantageous manufacturing options as a glue having a longer curing time may be used as the tape provides initial sufficient attachment.
In one or more embodiments of the present disclosure, one or more of the one or more step supports may comprise one or more resilient support elevations, such as wherein said one or more resilient support elevations comprises discretely arranged support elevations and/or one or more adhesives.
This may reduce the risk of breakage of the first projecting glass sheet portion. In some embodiments, the resilient support elevation(s) may be provided by means of a glue and/or tape. The one or more resilient support elevations may be arranged between a profile part/wall of the step support and the projecting glass sheet portion.
In one or more embodiments of the present disclosure, the first projecting distance may be no more than 60 mm, such as no more than 30 mm, such as no more than 25 mm.
Tests have indicated that the first projecting glass sheet portion (with a 4 mm thermally tempered, exterior glass sheet and the exterior glass sheet being the first glass sheet) may become more fragile if it projects more than 25 mm or more than 30 mm.
Experiments have shown that without force transferring solution that take up/transfer impact forces, and if the projecting distance of the first projecting glass sheet portion is longer/larger than 30 mm, there may be an increased risk of breakage if subjected to e.g. hails. This was tested in a hail testing machine simulating hails. The hails was simulated by shooting solid steel balls towards the projecting glass sheet portion.
Assuring that the projecting distance of the first projecting glass sheet portion is no more than 30 mm, such as no more than 25 mm may provide a stronger solution where the risk of breakage is reduced without the need of providing a step support or other resilient measures for countering damages from impacts. If however a step support and/or other force transferring measures, such as a resilient force transferring protection member, is provided, the first projecting distance may be increased/longer than 40 mm, such as 45 mm or above.
In one or more embodiments of the present disclosure, a member, such as a wall member, providing the step support may comprise a part of a cladding. In some embodiments hereof, said part of the cladding comprises a covering part which is configured to provide water tightening at the bottom part of the roof window.
In one or more embodiments of the present disclosure, an extension may be arranged in continuation of the bottom of the exterior glass sheet. The extension extends with an extension distance.
This may provide a more resistant solution while enabling providing an aesthetically appealing solution. The extension may allow for providing a shorter first projecting glass sheet portion thereby e.g. reducing the risk of damage on the first projecting glass sheet portion doe to e.g. exterior forces, while enabling providing an aesthetically desirable solution.
In one or more embodiments of the present disclosure, the extension may be arranged opposite to the bottom edge, such as opposite a bottom edge surface, of the exterior glass sheet.
This may provide a good mechanical protection and/or a holding feature for holding the exterior glass sheet in extreme situation. It may moreover enable providing an aesthetically appealing solution.
In one or more embodiments of the present disclosure, the extension may comprise an exterior surface which is configured to be visible from the exterior of the building.
In some embodiments, the exterior surface of the extension may be a surface of an extension body.
In one or more embodiments of the present disclosure, said exterior surface of the extension may be substantially flush with the exterior major surface of the exterior glass sheet which is configured to face away from the interior of the building.
In one or more embodiments of the present disclosure, the exterior surface of the extension vary with no more than ±5 mm, such as no more than ±3 mm, such as no more than ± 1 mm, from the plane comprising the exterior surface of the exterior glass sheet. This variation may be provided over a distance of at least 1 cm, such as at least 3 cm or at least 5 cm, from the exterior glass sheet bottom edge.
This may provide a resistant and aesthetically appealing solution that is less prone to breakage of the first projecting glass sheet portion.
In one or more embodiments of the present disclosure, the extension may comprise one or more of a glass sheet, a metal sheet and/or a polymer sheet.
In one or more embodiments of the present disclosure, the extension comprises an extension body which is supported by, such as carried by, an extension body support. In some further embodiments hereof, the extension body may be attached to the extension body support, w herein the extension body comprises an exterior, visible surface configured to face the exterior of the building.
This may e.g. provide an aesthetically appealing and strong solution. It may additionally provide a solution where the extension, such as the extension body, may be exchanged.
In other embodiments of the present disclosure, the extension may comprise an extension member provided by a plate/sheet, such as a polymer sheet/plate and/or a metal sheet/plate, e.g. comprising one or more of aluminium, iron or steel. The extension member may here be arranged in continuation of the external glass sheet bottom edge and provides the visible extension surface facing away from the building interior and which is subjected to weather such as rain and sunlight. This surface may or may not be applied with a coating, such as a paint or an enamel. In this embodiment, an extension body, such as a replaceable body, may be omitted.
In one or more embodiments of the present disclosure, the extension 18 comprises an elongated, structural profile, such as a metal profile, providing the structural integrity of the extension. In one or more embodiments of the present disclosure, the elongated, structural profile of the extension comprises a metal sheet having a thickness between 0.5 mm and 2 mm, such as between 0.5 mm and 1.3 mm, such as between 0.7 mm and 1.0 mm.
In one or more embodiments of the present disclosure, the extension body comprises one or more functional parts. In one or more embodiments of the present disclosure, the functional part is configured to provide an output such as an electric output, such as a power supply output.
In one or more embodiments of the present disclosure, the extension body may comprise one or more electric circuitries and/or electric components.
In one or more embodiments of the present disclosure, the extension body may comprise a photovoltaic module.
In one or more embodiments of the present disclosure, the extension body may comprise a sensor, for example one or more of a rain sensor, a light sensor, a temperature sensor or a humidity sensor.
The functional part may e.g. provide advantages in relation to e.g. obtaining recharging a battery of an actuator or the like of the roof window, providing sensor information, such as weather information, such as e.g. temperature information rain information, air humidity information, air pressure information and/or the like.
In one or more embodiments of the present disclosure, the extension body may be supported by, such as carried by, a member providing a cladding of the roof window.
This may e.g. provide a mechanically simple and/or space saving solution while obtaining enhanced water tightness at the roof window bottom. The cladding member may comprise a covering part ensuring increased water tightness at the roof window bottom.
In one or more embodiments of the present disclosure, an exterior surface of the extension may be substantially identical and/or substantially visually identical to the exterior surface of the exterior surface of the first projecting glass sheet portion. This may e.g. enable providing an aesthetically pleasing solution.
In one or more embodiments of the present disclosure, the extension body may comprise a glass sheet and/or an exterior glass sheet surface. This may e.g. enable providing an aesthetically pleasing solution.
In one or more embodiments of the present disclosure, the extension may be supported by the movable frame, such as carried by the movable frame.
In one or more embodiments of the present disclosure, the extension may be attached to a profile of the movable frame by means of one or more mechanical fasteners. In one or more embodiments of the present disclosure, the extension may be attached to a profile of the movable frame by means of attaching an attachment part, such as a bracket, to the frame profile.
This may provide a stronger and/or more safe solution where the risk of breakage or damage of the first projecting glass sheet portion is reduced.
In some embodiments, the extension may be attached to the profile of the movable frame at a surface of the profile that faces a profile of the fixation frame when the movable frame is in a closed position.
In one or more embodiments of the present disclosure, the extension may be supported by, such as mainly carried by, the vacuum insulated glass unit.
This may e.g. provide a solution that may be easy to install and/or space saving.
In one or more embodiments of the present disclosure, the extension may be supported by the first projecting glass sheet portion. In one or more embodiments of the present disclosure, the extension may be mainly carried by the first projecting glass sheet portion.
This may e.g. provide a solution that may be space saving. It may allow for a solution where the extension may be allowed to deflect in case of more extreme external forces such as hails, and this may reduce the risk of transferring damaging forces to the first projecting glass sheet portion.
In one or more embodiments of the present disclosure, the extension may be substantially unsupported by the exterior glass sheet. In one or more embodiments of the present disclosure, the extension may be substantially unsupported by the vacuum insulated glass unit.
This may e.g. reduce the risk of transferring damaging forces to the vacuum insulated glass unit and/or to the first projecting glass sheet portion.
In one or more embodiments of the present disclosure, the roof window comprises a cladding member. The cladding member may comprise a covering part which is configured to provide water tightening at the bottom part of the roof window.
In one or more embodiments of the present disclosure, the extension comprises a cladding member of the roof window, The cladding member may comprise a covering part which is configured to provide water tightening at the bottom part of the roof window.
In one or more embodiments of the present disclosure, the covering part may extend in a direction away from a plane defined by a major exterior surface of a glass sheet of the vacuum insulated glass unit to a position opposite the exterior of the frame.
In one or more embodiments of the present disclosure, the cladding member such as the covering part, may be integrated in a member, such as a metal or polymer plate member, comprising said extension.
Roof windows may need more advanced water tightening due to the way it is subjected to rain, snow and/or hails. This may also dependent of the roof window type. The cladding helps to provide an enhanced water tightening at the roof window bottom.
In one or more embodiments of the present disclosure, the extension, such as the extension body, may overlap the further structural bottom profile of the fixation frame.
This may e.g. enable providing a strong and aesthetically pleasing solution.
In one or more embodiments of the present disclosure, an enamel layer, such as an enamel layer which is substantially opaque to at least visible light, covers, such as is applied to, a surface of the extension body. In some embodiments, the enamel layer may be placed between the extension body and an extension body support.
This may e.g. help to provide a desirable aesthetical impression.
In one or more embodiments of the present disclosure, the thickness of the extension body may be lower/smaller than the thickness of the exterior glass sheet. For example, in some embodiments of the present disclosure, the extension body may have a thickness that is at least 10% lower, such as at least 25% lower or at least 40% lower than the thickness of the exterior glass sheet.
This may e.g. help to provide a more adaptable solution providing a desirable aesthetical impression. Additionally or alternatively it may help to reduce carbon foot print while providing an aesthetically desirable solution, for example if the extension body comprises or substantially consist of, a glass body (which in some embodiments also may comprise an opaque enamel layer).
In other embodiments, the extension body may have a thickness that is identical to the thickness of the exterior glass sheet or larger than the thickness of the exterior glass sheet.
In one or more embodiments of the present disclosure, the extension body may be attached to the extension body support by means of one or more fasteners, such as mechanical fasteners, such as comprising one or more mechanical, releasable fasteners. In one or more embodiments of the present disclosure, the extension body may additionally or alternatively be attached to the extension body support by means of one or more adhesives.
In one or more embodiments of the present disclosure, the extension body may be replaceably attached at the extension body support additionally or alternatively the extension may be replaceably attached to the frame. In some further embodiments, said replacement may be provided by manipulating one or more mechanical fasteners.
This may e.g. provide advantages to the end window owner, It may provide adaptability advantages during manufacturing and/or the like.
In one or more embodiments of the present disclosure, the extension body may comprises or is a dummy extension body, such as an extension body configured to resemble the exterior glass sheet and/or the surface characteristics, such as the glossiness, of the exterior surface of the exterior glass sheet.
This may e.g. provide a cost efficient, aesthetically pleasing solution.
This may e.g. provide that the roof window initially is delivered with a "dummy" extension body. This may later, in some embodiments, be replaced/retrofitted by a functional extension body such as comprising a photovoltaic module and/or a rain sensor.
The extension body, such as the dummy extension body, may e.g. comprise a glass sheet.
In one or more embodiments of the present disclosure, the extension, such as a profile comprises a mechanical holding member which is configured to secure the exterior glass sheet at the bottom thereof. In some embodiments hereof, the mechanical holding member may comprise a holding wall.
This may provide mechanical protection and/or a holding feature for mechanically holding the exterior glass sheet in extreme or unexpected situations.
In some embodiments, said mechanical holding member may comprise a wall placed opposite to, such as next to, the bottom edge of the exterior glass sheet.
In some embodiments, said mechanical holding member may comprise a hook part extending to a position opposite to the exterior major surface of the exterior glass sheet, wherein the hook part is configured to secure the exterior glass sheet at the frame.
The hook part may e.g. provide securing in situation where wind or other forces provided a dragging in the vacuum insulated glass unit in a direction away from the exterior surface of the vacuum insulated glass unit which faces the exterior of the building.
In one or more embodiments of the present disclosure, the bottom edge of the exterior glass sheet may be placed at a first side of a holding wall of the mechanical holding member, and the extension body may be placed at the opposite side of the holding wall.
This may e.g. provide an aesthetically appealing and/or more resistant solution.
In one or more embodiments of the present disclosure, the first projecting distance may be no more than 55 mm, such as no more than 45 mm, such as no more than 30 mm. This may provide a stronger solution as the extension may then instead provide a further overlap of the frame.
In one or more embodiments of the present disclosure, the extension distance may be at least 10 mm, such as at least 20 mm, such as at least 50 mm.
In one or more embodiments of the present disclosure, the sum of the extension distance and the first projecting distance may be at least 40 mm, such as at least 60 mm.
This may e.g. help to provide improved aesthetics and a more resistant solution.
In one or more embodiments of the present disclosure, the exterior glass sheet may comprise one or more projecting glass sheet portions which projects beyond a side edge of the adjacent glass sheet with a second projecting distance. The one or more projecting glass sheet portions which projects beyond a side edge of the adjacent glass sheet with the second projecting distance may also be referred to in the present document as third projecting glass sheet portion in order to improve clarity and/or readability.
This may e.g. help to provide improved aesthetics and/or improved water thigtening. It may additionally or alternatively enable providing a reduced carbon footprint.
In one or more embodiments of the present disclosure, the exterior glass sheet may comprise said one or more third projecting glass sheet portions which projects beyond a side edge of the adjacent glass sheet with a second projecting distance, and may moreover comprise said first projecting glass sheet portion which projects beyond a bottom edge of the second glass sheet with a first projecting distance.
The second projecting distance may or may not be smaller than the first projecting distance. In some embodiments of the present disclosure, the second projecting distance is no more than 30 mm, such as no more than 25 mm.
In one or more embodiments of the present disclosure, the second projecting distance may be smaller than the first projecting distance.
In one or more embodiments of the present disclosure, a wall member providing a step support as e.g. mentioned above may project beyond the bottom edge of the exterior glass sheet so as to provide a part of the extension. This may e.g. provide a mechanically simple and/or a cost efficient and/or a space saving solution.
In one or more embodiments of the present disclosure, the roof window may comprise elongated side water covers. The elongated side water covers may overlap the exterior glass sheet surface of the vacuum insulated glass unit.
Water tightening of e.g. roof windows of the centre hung type may need to be rather extensive. Such side water covers may provide improved water tightening.
In some embodiments of the present disclosure, the elongated side water covers may comprise first side water covers, such as lower side water covers, attached to the movable frame and/or insulating glass unit, and second side water covers, such as upper side water covers, attached to a fixation frame of the roof window.
The first and second side water covers may in some embodiments be arranged in continuation of each other when the movable frame is in a closed position.
In some embodiments of the present disclosure, the elongated side water covers may overlaps a side frame profile of the fixation frame.
In some embodiments of the present disclosure, the elongated side water covers may overlaps a side frame profile of the movable frame.
In one or more embodiments of the present disclosure, the glass sheet which is adjacent to the exterior glass sheet may comprise a projecting glass sheet portion which projects beyond the edge of the exterior glass sheet at the top of the roof window. This projecting portion may also be referred to in the present document as fourth projecting glass sheet portion.
This may e.g. reduce carbon footprint and/or enable providing a more space saving solution with sufficient water tightening.
In one or more embodiments of the present disclosure, a top cover of the roof window may overlap the exterior major surface of the exterior glass sheet at the top of the roof window.
In one or more embodiments of the present disclosure, the exterior surface of the vacuum insulated glass unit may be configured to substantially coincide with or be arranged below an exterior plane defined by a flashing of the roof window. Additionally or alternatively, the exterior surface of the vacuum insulated glass unit may be configured to substantially coincide with or be arranged below an exterior plane defined by a roofing when the roof window is installed in a roof structure of the building.
This may e.g. provide a more aesthetically desirable solution.
In one or more embodiments of the present disclosure, the exterior major surface of the vacuum insulated glass unit is comprised in a first plane, wherein the first plane is configured to substantially coincide with or be arranged below a second, exterior plane defined by a flashing and/or is defined by a part of the roof structure, when the roof window is installed in a roof structure of the building.
This may e.g. provide a more aesthetically desirable solution.
In one or more embodiments of the present disclosure, the first plane and the second plane may be configured to be substantially parallel, such as at least when a movable frame of the roof window is in a closed position.
In one or more embodiments of the present disclosure, the vacuum insulated glass unit comprises a further insulating gap, This provides improved heat insulation.
In one or more embodiments of the present disclosure, the vacuum insulated glass unit may comprise a third glass sheet, wherein a further insulating gap is placed between a first major surface of the third glass sheet facing the further insulating gap and a major surface of a glass sheet of the vacuum insulated glass unit which faces the further insulating gap.
This may e.g. provide a vacuum insulated glass unit with improved heat insulation performance when compared to a vacuum insulating glass unit comprising just one insulating gap being the evacuated gap. It may additionally provide a vacuum insulating glass unit with improve heat insulation near the glass unit edges.
In one or more embodiments of the present disclosure, said major surface of the glass sheet of the vacuum insulated glass unit which faces the further insulating gap may be a second major surface of the second glass sheet which faces away from the evacuated gap The second glass sheet is hence placed between the evacuated gap and the further insulating gap. Major, oppositely directed surfaces of the second glass sheet may thus abut the further insulating gap and the evacuated gap, respectively.
In one or more embodiments of the present disclosure, said further insulating gap may be placed between the lamination layer and the evacuated gap. Hence, the evacuated gap may be the outermost insulating gap of the vacuum insulated glass unit that is configured to be the insulating gap arranged proximate the exterior of the building.
In one or more embodiments of the present disclosure, the further insulating gap may be the insulating gap of the insulating gaps of the vacuum insulated which is configured to be placed proximate the exterior (EXT) of the building.
In one or more embodiments of the present disclosure, the evacuated gap is placed between the further insulating gap and the lamination layer. Hence, the further insulating gap may be the outermost insulating gap of the vacuum insulated glass unit that is configured to be the insulating gap arranged proximate the exterior of the building.
In one or more embodiments of the present disclosure, the further insulating gap may be a gas filled gap (7), such as a gap (7) comprising argon gas. This may e.g. provide insulating advantages and/or other advantages provided by each of these insulating gap types, i.e. the gas filled insulating gap type and the evacuated gap type. Additionally or alternatively, it may reduce drawbacks caused by e.g. the edge seal, such as a solder material edge seal, enclosing the evacuated gap.
The edge seal enclosing the evacuated gap may be rigid and hence provide stress conditions when the vacuum insulated glass unit is subjected to thermal expansion due to temperature differences between the exterior surfaces of the vacuum insulating glass unit. Additionally or alternatively, the solder edge seal may provide a thermal bridge. The gas filled insulating gap and/or an edge seal enclosing the further insulating gap, may reduce drawbacks caused by e.g. the edge seal, such as a solder material edge seal, enclosing the evacuated gap.
In one or more embodiments of the present disclosure, the third glass sheet may be arranged between the second glass sheet and a lamination interlayer of the lamination layer.
In one or more embodiments of the present disclosure, a lamination layer may be attached to a major surface of the third glass sheet.
In one or more embodiments of the present disclosure, one or more low-e coatings (16b) may be arranged at the first major surface of the third glass sheet.This may provide enhanced insulation performance.
In one or more embodiments of the present disclosure, the first projecting glass sheet portion may projects beyond a bottom edge of the third glass sheet. This may provide a space saving solution, an aesthetically advantageous solution and/or may help to provide reduced carbon footprint.
In one or more embodiments of the present disclosure, the third glass sheet may be the exterior glass sheet.
In one or more embodiments of the present disclosure, the further insulating gap may overlap, such as partly or fully overlaps, the edge seal which encloses the evacuated gap. This may e.g. reduce drawbacks caused by hight heat conduction of the edge seal material which encloses the evacuated gap.
In one or more embodiments of the present disclosure, the edge seal which encloses the evacuated gap partly or fully overlaps an edge seal which encloses the further insulating gap. This may e.g. provide a space saving solution, may provide advantages in relation to reducing a cold bridge caused by hight heat conduction of the edge seal material which encloses the evacuated gap and/or the like.
In one or more embodiments of the present disclosure, the evacuated gap may overlap, such as partly or fully overlap, an edge seal which encloses the further insulating gap. This may e.g. provide a space saving solution, may provide advantages in relation to reducing a cold bridge caused by hight heat conduction of the edge seal material which encloses the evacuated gap and/or the like.
In one or more embodiments of the present disclosure, an enamel layer may cover a part of the evacuated gap and/or the further insulating gap.
In one or more embodiments of the present disclosure, the roof window may comprise a cladding member, wherein the cladding member comprises a covering part configured to provide water tightening at the bottom part of the roof window.
The cladding member and the covering part of the cladding member may provide increased water tightness at the roof window bottom.
In one or more embodiments of the present disclosure, the covering part of the cladding member may cover a bottom part of the roof window. The covering part may extend to a position opposite a bottom part of the fixation frame. In some embodiments, the covering part extends in a direction away from a plane comprising a major surface of a glass sheet of the vacuum insulated glass unit, to a position opposite the exterior of the frame, such as the exterior of a fixation frame. This may provide improved water tightening.
In one or more embodiments of the present disclosure, the cladding member comprises a shield and/or a connection part, which overlaps the exterior major surface of the first projecting glass sheet portion configured to face away from the building interior.
The shield may e.g. protect the first projecting glass sheet portion at the bottom of thereof window and reduce risk of the first projecting glass sheet portion breaking when subjected to e.g. hails or other exterior forces.
In one or more embodiments of the present disclosure, the shield, such as the connection part, is supported by, such as attached to, the exterior major surface of the first projecting glass sheet portion configured to face away from the building interior.
This may provide improved water tightening and/or a robust solution.
In one or more embodiments of the present disclosure, the shield, such as the connection part may be unitary with the covering part.
In one or more embodiments of the present disclosure, a part of the shield may be unattached to the exterior major surface. In one or more embodiments of the present disclosure, a part of the shield may be attached to the exterior major surface.
In one or more embodiments of the present disclosure, a part of the shield may extend over the exterior major surface of the first projecting glass sheet portion with a distance to the exterior major surface.
This may provide improved protection and/or spare adhesive material.
In one or more embodiments of the present disclosure, the cladding member, such as the shield, such as the connection part, may provide mechanical shielding of the first projecting glass sheet portion.
This may help to reduce the risk of the first projecting glass sheet portion breaking due to forces, such as external forces, such as external forces caused by weather conditions.
In one or more embodiments of the present disclosure, the cladding member, such as the connection part and/or covering part, may comprise or consist of a sheet material, such as a metal sheet material, such as a metal sheet material comprising one or more bends.
In one or more embodiments of the present disclosure, the covering part and/or the connection part may be visible from the outside of the window when the movable frame is in a closed position.
In one or more embodiments of the present disclosure, the cladding member comprises a connection part which extends in between the first projecting glass sheet portion and a bottom frame profile of the fixation frame.
In one or more embodiments of the present disclosure, the exterior glass sheet may comprise a projecting glass sheet portion at the top of the roof window, which projecting glass sheet portion projects beyond a top edge of the adjacent glass sheet.
This may e.g. enable design of a roof window that is more cost efficient and/or less mechanically complex at the top of the roof window. For example due to that the projecting glass sheet portion of the exterior glass sheet at the roof window top provides advantages in relation to water tightening.
In one or more embodiments of the present disclosure, a gasket of the roof window comprises one or more parts, such as one or more gasket lips, which support on said projecting glass sheet portion.
In one or more embodiments of the present disclosure, one or more gasket parts may supports directly on the exterior surface of the exterior glass sheet at the projecting glass sheet portion that projects beyond a top edge of the adjacent glass sheet (3b, 3a).
This may e.g. provide a more mechanically simple solution and/or a water tightening solution, and/or a more space saving solution.
In one or more embodiments of the present disclosure, the vacuum insulated glass unit comprises just one insulating gap which is the evacuated gap. This may provide a cost efficient solution and/or a solution providing good heat insulation due to the evacuated gap, while enabling a solution with lower carbon foot print (compared to solution having multiple insulating gaps and/or solutions comprising multiple projecting glass sheets). It also enables desirable aesthetics and/or water tightening due to the one or more projecting glass sheet portions such as the first projecting glass sheet portion of the exterior glass sheet.
In one or more embodiments of the present disclosure, one or more low-e coatings may be arranged at the major surface of the second glass sheet facing towards the insulating gap and towards the exterior glass sheet.
In one or more embodiments of the present disclosure, a gripping member of one or more mechanical fastening parts may extend in between glass sheets of the vacuum insulated glass unit so as to provide a fixation of the vacuum insulated glass unit to the frame.
In one or more embodiments of the present disclosure, the gripping member extends in between the exterior glass sheet and the third glass sheet of the vacuum insulated glass unit.
In one or more embodiments of the present disclosure, the first and second glass sheets may be tempered glass sheets, such as thermally tempered glass sheets.
In one or more embodiments of the present disclosure, the first projecting glass sheet portion may project beyond a bottom edge of all other glass sheets of the vacuum insulated glass unit.
In one or more embodiments of the present disclosure, the roof window is of the type configured to be installed in a roof structure having a roof pitch above 17°, such as above 30° relative to horizontal.
In one or more embodiments of the present disclosure, the vacuum insulated glass unit, including the first projecting glass sheet portion, may extend over the entire width of the bottom profile (of the movable frame, and over at least 20%, such as over at least 50%, such as over at least 90% of the width of the bottom profile of the fixation frame.
In one or more embodiments of the present disclosure, the first glass sheet and/or second glass sheet has a thickness of between 2.5 mm and 5 mm, such as between 3 mm and 4.5 mm, such as 3 mm or 4 mm.
In one or more embodiments of the present disclosure, at least one insulating gap of the vacuum insulated glass unit is arranged between a major surface of the exterior glass sheet and a major surface of a glass sheet of the vacuum insulated glass unit which is adjacent to the exterior glass sheet of the vacuum insulated glass unit. This may provide good heat insulation. In one or more further embodiments of the present disclosure, said insulating gap may be said evacuated gap, and said second glass sheet may be said adjacent glass sheet. This may provide good heat insulation since the evacuated gap is hence proximate, such as abutting, the first glass sheet.
In one or more embodiments of the present disclosure, the total surface area of a major surface of the exterior glass sheet may be larger than the total surface area of the adjacent glass sheet.
In one or more embodiments of the present disclosure, the roof window is configured to be installed in a roof structure having a roof pitch above 17°, such as above 30°, relative to horizontal.
In one or more embodiments of the present disclosure, the frame, such as the movable frame and/or the fixation frame, may comprise a top frame profile at the top of the roof window, a bottom frame profile at the bottom of the roof window, and side frame profiles extending between the top profile and bottom profile.
In one or more embodiments of the present disclosure, the frame comprises a fixation frame comprising a top frame profile at the top of the roof window, a bottom frame profile at the bottom of the roof window, and side frame profiles extending between the top frame profile and bottom frame profile of the fixation frame, wherein said profiles encloses a frame opening.
In one or more embodiments of the present disclosure, the frame comprises a movable frame comprising a top frame profile at the top of the roof window, a bottom frame profile at the bottom of the roof window, and side frame profiles extending between the top profile and bottom profile of the movable frame, wherein said profiles encloses a frame opening, wherein the vacuum insulated glass unit (3) is attached to the movable frame.
In some embodiments, the fixation frame may be larger than the movable frame. In one or more embodiments of the present disclosure, the fixation frame may enclose the outer boundary of the movable frame. In one or more embodiments of the present disclosure, the movable frame may be arranged in the frame opening of the fixation frame.
In one or more embodiments of the present disclosure, the roof window is of the centre hung type.
In one or more embodiments of the present disclosure, the roof window is of the top hung type. In some embodiments hereof, the roof window is of the non-centre hung type. In other embodiments, the roof window may comprise a movable frame that is both top hung and centre hung.
In one or more embodiments of the present disclosure, one or more of the edge(s) of the vacuum insulated glass unit which is/are arranged along the top, bottom and/or side(s) of the roof window may be insulated by means of edge heat insulation that is arranged opposite to the edge region of the VIG unit. The edge heat insulation may be configured so as to reduce heat transfer at the area of the edge seal enclosing the evacuated gap when compared to a scenario where the edge heat insulation is omitted. The edge seral enclosing the evacuated gap may have poor heat insulation performance. The edge heat insulation may help to reduce issues caused by this poor heat insulation performance.
The present disclosure moreover relates to building comprising one or more roof windows according to one or more of the embodiments described above, wherein said one or more roof windows is/are installed in a roof structure of the building.

Description of the drawings

The present disclosure will in the following be described in greater detail with reference to the accompanying drawings:

Fig. 1: illustrates schematically a roof window comprising a first projecting glass sheet portion, according to one or more embodiments of the present disclosure
Figs. 2a-2b: illustrates schematically a roof window in a closed state and an open state, respectively, according to one or more embodiments of the present disclosure,
Fig. 3: illustrates schematically a roof window installed in a building roof structure according to one or more embodiments of the present disclosure,
Fig. 4: illustrates schematically an embodiment of the present disclosure where a glass sheet projects beyond a lamination layer, according to one or more embodiments of the present disclosure,
Fig. 5: illustrates schematically a roof window comprising a gripping member, according to one or more embodiments of the present disclosure,
Fig. 6: illustrates schematically a protection sealing that covers an edge seal, according to one or more embodiments of the present disclosure,
Fig. 7: illustrates schematically an enamel covering a projecting glass sheet, according to one or more embodiments of the present disclosure,
Fig. 8: illustrates schematically a vacuum insulated glass unit comprising a low-e coating, according to one or more embodiments of the present disclosure,
Figs. 9-12: illustrates schematically various embodiments of a roof window comprising one or more supports configured to support a projecting glass sheet portion, according various embodiments of the present disclosure,
Figs. 13-17: illustrates schematically various embodiments of a roof window comprising an extension, according to various embodiments of the present disclosure,
Fig. 18: illustrates schematically an exterior glass sheet comprising projecting portions at a side of the roof window, according to one or more embodiments of the present disclosure,
Fig. 19: illustrates schematically a projecting glass sheet portion which projects beyond an edge of an exterior glass sheet at the top of a roof window, according to one or more embodiments of the present disclosure,
Fig. 20: illustrates schematically a protection sealing (between surfaces of glass sheets, according to one or more embodiments of the present disclosure,
Fig. 21: illustrates schematically an exterior surface of a vacuum insulated glass unit which is arranged below an exterior flashing plane, according to one or more embodiments of the present disclosure,
Fig. 22: illustrates schematically a vacuum insulated glass unit comprising a further insulating gap, such as a gas filled gap, according to one or more embodiments of the present disclosure,
Figs. 23-23a: illustrates schematically a cladding member comprising a connection part and a covering part, and providing shielding, according to various embodiments of the present disclosure,
Fig. 24: illustrates schematically an extension comprising a mechanical holding member configured to secure an exterior glass sheet, according to one or more embodiments of the present disclosure,
Fig. 25: illustrates schematically an exterior glass sheet comprising a projecting glass sheet portion at the top of a roof window, according to one or more embodiments of the present disclosure,
Fig. 26: illustrates schematically that an evacuated gap overlaps an edge seal enclosing a further insulating gap, according to one or more embodiments of the present disclosure,
Fig. 27: illustrates schematically a vacuum insulated glass unit where a further insulating gap overlaps an edge seal enclosing an evacuated gap , according to one or more embodiments of the present disclosure,
Fig. 28: illustrates schematically a gripping member extending in between glass sheets, according to one or more embodiments of the present disclosure,
Fig. 29: illustrates schematically a roof window comprising a vacuum insulated glass unit that comprises a further insulating gap, where a gripping member extends in between an exterior glass sheet and a major surface of a glass sheet facing away from an evacuated gap, according to one or more embodiments of the present disclosure,
Fig. 30: illustrates schematically a vacuum insulated glass unit comprising a larger, further insulating gap, according to one or more embodiments of the present disclosure,
Fig. 31: illustrates schematically a roof window comprising a vacuum insulated glass unit that comprises a further insulating gap, and an extension,
Fig. 32: illustrates schematically a roof window where a vacuum insulated glass unit comprises a further insulating gap and an exterior glass sheet which is displaced relative to the adjacent glass sheet towards a roof window bottom,
Fig. 33: illustrates schematically a roof window installed in a building roof structure and comprising an extension,
Fig. 34: illustrates schematically a roof window installed in a building roof structure and comprising an extension,
Fig. 35: illustrates schematically a vacuum insulated glass unit for a roof window, according to embodiments of the present disclosure,
Fig. 36: illustrates schematically an embodiment of the present disclosure, wherein a step support comprises a mechanical holding member,
Fig. 37: illustrates schematically a centre hung roof window according to embodiments of the present disclosure,
Fig. 38: illustrates schematically a roof window wherein a step support is attached to a projecting glass sheet portion, according to embodiments of the present disclosure,
Fig. 39: illustrates schematically an embodiment of the present disclosure, wherein a distance with which an exterior glass sheet projects beyond a bottom edge of a second glass sheet is larger than a distance with which another glass sheet projects beyond the bottom edge of the second glass sheet.

Detailed description

Fig. 1 illustrates schematically a cross section of a roof window 1 for installation in a roof structure of a building (not illustrated in fig 1). The roof window comprises a frame 2 and a vacuum insulated glass unit 3.
The frame 2 comprises a movable frame 2a (also called movable unit in the present document) and a fixation frame 2a. The movable frame 2a is configured to move, such as pivot, relative to the fixation frame 2b by means of one or more hinges (not illustrated in fig. 1) between an open position and a closed position. Hence, the window 1 can open and close.
The vacuum insulated glass unit 3 (may also be referred to as glass unit 3 in the below) is attached to the movable frame 2a and is configured to move together with the movable frame 2a. The movable frame 2a comprises a first frame opening FO1 that is enclosed by structural frame profiles 2a_to, 2a_bo, at the top TO and bottom BO of the roof window respectively. The movable frame 2a moreover comprises two structural side frame profiles 2a_si (one is visible in fig. 1) extending between the top profile 2a_to and bottom profile 2a-bo. The frame profiles of the movable frame 2a together encloses the first frame opening FO1, which may be a rectangular frame opening, through which sunlight can pass from the vacuum insulated glass unit.
The roof window 1 in fig. 1 is a roof window of the centre hung type. The movable frame 2a is enclosed by a fixation frame 2b which provides a second frame opening FO2. Hence, a bottom profile surface 2a_bos1 (See figs 2A-2B) of the movable frame 2a faces the first frame opening FO1 whereas an oppositely directed surface 2a_bos2 (See figs 2A-2B) of that bottom profile 2a_bo faces the fixation frame 2b. The fixation frame 2b encloses the second frame opening FO2. The second frame opening FO is arranged between structural top 2b_to and bottom 2b_bo profiles, as well as between structural side profiles 2b_si (one is visible in fig. 1) of the fixation frame 2b. The movable frame 2a is thereby arranged in the second frame opening FO2. The fixation frame 2b is configured to be fixed to, such as build into, a building roof structure. The roof window 1 comprises water tightening covers comprising a top cover 24 and a cladding member 13. The roof window 1 may also comprise side water covers 21a, 21b (not illustrated in fig. 1). These covers are described in more details further below.
The frame profiles 2a_bo, 2a_to, 2a_si of the movable frame 2a and/or the frame profiles 2b_bo, 2b_to, 2b_si of the fixation frame 2b may be substantially solid, e.g. made partly or fully from a wood material or a combination of materials.
In some embodiments of the present disclosure, one, more than one, or all, of the frame profiles 2a_bo, 2a_to, 2a_si, 2b_bo, 2b_to, 2b_si may comprise an outer shell provided by exterior profile walls providing the outer profile boundary. The exterior walls may be structural. The exterior walls may in some embodiments comprise or consist of a polymer wall such as comprising a Polyvinyl Chloride (PVC) walls such as Chlorinated Polyvinyl Chloride (CPVC). In some embodiments, the polymer wall material of the exterior walls may be reinforced by means of reinforcements, such as fibres, such as glass fibres or carbon fibres, intermixed with the polymer wall material. In some embodiments, the polymer wall material may comprise between 15% and 35% fibre reinforcement by WT profile wall material, such as between 20% and 30% fibre reinforcement by weight profile wall material. In other embodiments, the exterior profile walls may not comprise fibre reinforcement. In some embodiments, the fibre reinforcement content by WT profile wall material may be less than 3%, such as less than 1 % or less than 0.5% by weight.
The exterior walls of the frame profiles may enclose a frame profile interior comprising one or more interior chambers. This/these chambers may provide heat insulation. In some embodiments, one or more of the one or more interior chambers may be filled with an insulation material such as comprising an expanded foam, mineral wool, glass wool, natural fibre based insulation and/or the like. In further embodiments, one or more reinforcements such as metal reinforcements, such as aluminium, iron or steel reinforcements, may be arranged in or at the frame profiles 2a_bo, 2a_to, 2a_si, 2b_bo, 2b_to, 2b_si to increase the structural strength.
It is noted that the frame profiles 2a_bo, 2a_to, 2a_si, 2b_bo, 2b_to, 2b_si are elongated, and in fig. 1, a schematic cross section of profiles 2a_bo, 2a_to, 2b_bo, 2b_to is illustrated where the cross section plane is substantially perpendicular to the longitudinal direction of these profiles 2a_bo, 2a_to, 2b_bo, 2b_to. The cross section plane is substantially parallel with the longitudinal direction of the side profiles.
The movable frame 2a may or may not comprise a handle 27 for manually operating the movable frame between a closed and open position/state. The handle may be directly or indirectly connected to a locking mechanism (not illustrated) that enables locking the movable frame 2a relative to the fixation frame 2b in at least the closed position of the movable unit.
The vacuum insulated glass unit 3 comprises a first glass sheet 3a comprising a first major surface 3a1, and a second glass sheet 3b comprising a second major surface 3b1. These major glass sheet surfaces 3a1, 3b1 faces each other and an evacuated gap 4 paced between the major surfaces 3a1, 3b1. The glass sheet surfaces 3a1, 3b1 are substantially parallel. The glass sheets also comprises oppositely directed, major surface 3a2. 3b2 facing away from the evacuated gap 4.
A plurality of support structures 5 are arranged between the glass sheet surfaces 3a1, 3b1 with a mutual distance to the neighbouring support structures. These support structures 5 are distributed inside the evacuated gap 4 according to a predetermined pattern, e.g. in rows and columns. The support structures 5 maintains the gap 4 between the major glass sheet surfaces 3a1, 3b1 of the vacuum insulated glass (VIG) unit when the gap 4 has been evacuated and sealed.
The glass sheets 3a, 3b are sealed together at the periphery of the glass sheets 3a, 3b with the plurality of support structures 5 arranged between the major surfaces 3a1, 3b1 in the evacuated gap 4. The sealing together of the first and second glass sheets 3a, 3b may comprise use of an edge seal 9 material such as a solder glass edge seal material or a solder metal edge seal material. In some embodiments, the edge seal 9 material may comprise solder material such as a glass solder material, for example a glass solder frit material, such as a low melting point glass solder frit material.
The vacuum insulated glass unit 3 may in some embodiments comprise more than 300 support structures 5, such as more than 1000 or more than 2000 support structures 5arranged in the evacuated gap 4. The vacuum insulated glass unit 3 may in some embodiments comprise between 500 and 10000 support structures 5 , such as between 1000 and 600 support structures in the evacuated gap 4.
In some embodiments of the present disclosure, the low melting point glass solder frit material may have a rated melting temperature Tm below 500 °C, such as below 450 °C, such as below 410 °C. In some embodiments of the present disclosure, the low melting point glass solder frit material may have a rated melting temperature Tm above 300 °C, such as above 340 °C.
The sealing together of the glass sheet 3a, 3b at the edges by the edge seal 9 may provide a fused, rigid edge seal. The edge seal encloses the evacuated gap around the periphery/outer boundary of the evacuated gap 4.
Both major surfaces 3a1, 3b1 of the first and second glass sheet 3a, 3b which face the evacuated gap 4 may, in embodiments of the present disclosure, extend so as to cover the full, maximum width of the edge seal 9. This may be the case for the full extent of the edge seal 9 around the evacuated gap 4. Hence, the edge seal 9 may be arranged so as to substantially not extend beyond the glass sheet edges of the first 3a and second 3b glass sheets arranged proximate the edge seal 9.
In some embodiments, one or both glass sheets 3a, 3b may extend beyond the side 9a of the edge seal 9 facing away from the evacuated gap.
In some embodiments, the side 9a of the edge seal 9 facing away from the evacuated gap may be arranged between the major surfaces 3a1, 3b1 of the glass sheets 3a, 3b.
One or both glass sheets 3a, 3b may have a thickness between 1 mm and 6 mm, such as between 2 mm and 4 mm, for example between 2.5 mm and 3.5 mm including both end points. The glass sheets 3a, 3b may be of the same or different thickness.
In some embodiments, one or both glass sheets 3a, 3b has a thickness of between 2.5 mm and 5 mm, such as between 3 mm and 4.5 mm, such as 3 mm or 4 mm.
The glass sheets 3a 3b may be annealed glass sheets or tempered glass sheets, such as thermally tempered glass sheets. Thermally tempered glass sheets 3a, 3b may e.g. allow providing a VIG unit with larger mutual distance between adjacent support structures 5 and/or may allow use of thinner glass sheets 3a, 3b than if using annealed glass sheets.
The distance between neighbouring support structures 5 in the gap 4 may in embodiments of the present disclosure be between 20 mm and 70 mm, such as between 25 mm and 65 mm, such as between 35 mm and 45 mm.
If the glass sheets 3a and/or 3b are thermally tempered glass sheets, the major surfaces 3a1, 3a2, 3b1, 3b2 of these may be uneven due to e.g. a plurality of so-called roller waves, bending and/or due to global edge kink. These characteristics may originate from the manufacturing process of the thermally tempered glass sheets. The evacuated gap 4 has been evacuated to a reduced pressure (e.g. provided at an evacuation and sealing station. In embodiments of the present disclosure, the pressure in the evacuated gap 4 may be below 0.05 mbar, such as below 0.005 mbar, such as 0.003 or 0.001 mbar or below. This may be obtained by means of an evacuation pump before sealing the gap 4.
For this evacuation of the gap 4, a pump (not illustrated) may have been connected directly or indirectly to an evacuation hole of the VIG unit assembly, and after the evacuation, the evacuation hole is sealed by a gap sealing, such as at least partly by means of a solder material and/or another sealing solution, such as a permanent sealing solution. In some embodiments, the evacuation hole sealing solution may comprise a solder material and/or a glass pipe to be sealed by heating when the gap 4 has been finally evacuated to provide a VIG unit. In some embodiments, the evacuation of the gap 4 may be provided by means of a suction cup (not illustrated) arranged to cover an evacuation hole. In other embodiments, the evacuation may be provided inside an evacuation chamber.
The support structures 5 maintain a distance between the glass sheet surfaces 3a1, 3b1 across the evacuated gap when the gap 4 has been evacuated and sealed to provide the final VIG unit.
The distance between the major glass sheet surfaces 3a1, 3b1 facing the gap may in embodiments of the present disclosure be 0.5 mm or below, such as 0.3 mm or below, for example 0.2 mm or below. The distance between the major glass sheet surfaces 3a1, 3b1 facing the evacuated gap 4 may in embodiments of the present disclosure be between 0.05 mm and 0.6 mm, such as between 0.1 mm and 0.4 mm, such as between 0.15 and 0.25 mm. It is understood that the support structures 5 may have a height substantially matching such a gap height / distance between the glass sheet surfaces 3a1, 3b1.
It is generally to be understood that the final VIG unit 3 may e.g. be transparent to at least visible light, i.e. light in the spectrum that is visible to the human eye.
The vacuum insulated glass unit may also, in embodiments of the present disclosure, comprise a lamination layer 3c, 6. For example a multi-layer lamination layer, as illustrated.
The lamination layer 6, 3 in fig. 1 comprises a lamination interlayer 6. The lamination interlayer 6 may in embodiments comprise or consist of one or more of the following: ethylene vinyl acetate (EVA),

polyisobutylene (PIB),
polyacetals such as polyvinyl butyral (PVB),
transparent polyurethane (PU),
thermoplastic polyurethane (TPU),
polyvinyl chloride (PVC),
polyesters,
cyclo olefin polymers (COP),
ionomers and/or an ultraviolet activated adhesives.

In some embodiments, PVB, EVA or TPU may be preferred for the lamination interlayer.
In one or more embodiments, the lamination interlayer 6, may have a thickness (extending between the adjacent glass sheet surfaces) above 0.5 mm, such as above 0.7 mm, such as above 1 mm or above 1.4 mm.
In some embodiments, the lamination interlayer 6 has a thickness between 0.5 mm and 4 mm, such as between 0.6 mm and 3 mm, such as between 0.7 mm and 2 mm or between 1 mm and 3 mm.
The lamination layer also, in fig. 1, comprises a further glass sheet 3c attached to said lamination interlayer 6. The further glass sheet 3c may be tempered, such as thermally tempered, or annealed. The further glass sheet 3c, also called a lamination glass sheet 3c in this document, may have the same thickness, a lower thickness or a larger thickness, than the glass sheet thickness of the first and second glass sheets 3a, 3b. The lamination layer 3c, 6 provides safety and may e.g. carry broken parts of the glass unit 3 in case of breakage thereof, thereby reducing the number of falling parts.
The roof window is configured to be installed in a building roof structure so that the first glass sheet 3a of the vacuum insulated glass unit 3 is configured to be placed closer to the exterior EXT of the building than the second glass sheet 3b.
As can be seen in fig 1 and several other figures described in more details further below according to various embodiments of the present disclosure, the vacuum insulated glass unit 3 comprises an exterior glass sheet EGS. In fig. 1, the exterior glass sheet is the first glass sheet 3a. The exterior glass sheet is configured to be the outermost glass sheet arranged proximate the building exterior and which may act as a weather shield when the movable frame is in a closed position as e.g. illustrated in fig. 1. The exterior glass sheet EGS comprises the outer major surface of the glass unit 3 that faces towards the building exterior EXT and may abut the building exterior.
The exterior glass sheet EGS comprises a first projecting glass sheet portion 3p1. This first projecting glass sheet portion 3p1 projects beyond a bottom edge 3b_be of the second glass sheet 3b with a first projecting distance DIS1, The bottom edge of the second glass sheet 3b is configured to be the bottom edge of the glass sheet 3b that is arranged at the roof window bottom BO when the roof window is installed in the roof structure.
In fig. 1, the evacuated gap 4 of the glass unit 3 is arranged between the major surface 3a1 of the exterior glass sheet 3a and the major surface 3b1 of the second glass sheet, where the second glass sheet 3b is adjacent to the exterior glass sheet EGS, 3a of the vacuum insulated glass unit 3. Hence, the first projecting glass sheet portion 3p1 projects with the first projecting distance DIS1 beyond the bottom edge 3b_be of the glass sheet 3b of the vacuum insulated glass unit 3 which is adjacent to the exterior glass sheet 3a, 3d EGS of the vacuum insulated glass unit 3.
The roof window is configured to be installed so that the window top TO is arranged at a higher vertical level than the window bottom BO. As the roof window 1 in fig. 1 is of the centre hung type, the top part of the movable frame 2a is configured to move into the building, see dashed arrow AR1 whereas the bottom part of the movable frame 2a is configured to move towards the exterior of the building, see dashed arrow AR2. The rotation point for the movable frame 2a may be arranged between the top and bottom profiles 2a_bo, 2a_to, for example around the centre portion of the side profiles 2a_si. Roof windows of the centre hung type may e.g. allow rotation of the movable frame so that the exterior surface 3su1 of the glass unit may at least partly face the building interior INT during window cleaning/wash.
The roof window 1 may be of the type configured to be installed in a roof structure having a roof pitch above 17°, such as above 30° relative to horizontal.
As can be seen, the first projecting glass sheet portion 3p1 overlaps one or more structural bottom profiles 2a_bo, 2b_bo of the frame 2, 2a, 2b. In fig. 1, the first projecting glass sheet portion 3p1 with the first projecting distance DIS1 so as to both overlap the bottom profile 2a_bo of the movable frame and the bottom profile 2b_bo of the fixation frame.
In fig. 1, the second glass sheet 3b and a part of the evacuated gap 4 also overlaps a part of the bottom frame 3a_bo. This may help to move the edge seal further away from the first frame opening FO1, which may be advantageous as the edge seal 9 material may act as a cold bridge.
The first projecting distance DIS1 may in embodiments of the present disclosure be at least 6 mm such as 10 mm, such as at least 25 mm, such as at least 40 mm.
The first projecting distance DIS1 may in embodiments of the present disclosure be at least 40 mm, such as at least 50 mm, such as at least 80 mm, such as at least 100 mm.
In some embodiments of the present disclosure, the first projecting distance DIS1 may be no more than 30 mm, such as no more than 25 mm.
In some embodiments of the present disclosure, the first projecting distance DIS1 may be no more than 100 mm, such as no more than 80 mm, such as no more than 60 mm.
In some embodiments of the present disclosure, the first projecting distance DIS1 may be between 10 mm and 120 mm, such as between 25 mm and 80 mm, such as between 40 mm and 60 mm.
In some embodiments of the present disclosure, the first projecting distance DIS1 may be larger than the glass unit 3 thickness, such as wherein said glass unit 3 thickness substantially corresponds to the distance between the exterior major surfaces 3su1, 3su2 of glass unit in a direction perpendicular to a major surface of the exterior glass sheet EGS.
The major exterior surface 3su2 of the glass unit 3 is configured to abut the interior INT of the building. The oppositely directed exterior major surface 3su2 is configured to abut the building exterior EXT.
In fig. 1, the exterior glass sheet EGS, 3a overlaps the full width W1 of the structural bottom profile 2a_bo of the movable frame. This is obtained by a part of the exterior glass sheet EGS placed opposite to the evacuated gap 4, and a further part of the glass sheet that is part of the first projecting glass sheet portion 3p1. In other embodiments, the exterior glass sheet EGS may not overlap the full width W1 of the structural bottom profile 2a_bo of the movable frame, but may instead only partly overlap the full width W1 of the structural bottom profile 2a_bo (see e.g. fig. 34).
In fig 1, the bottom edge of the second glass sheet 3b, and the bottom edge of the lamination layer, are terminated at a location above a surface 2a_S3 of the bottom frame profile 2a_bo that faces the glass unit 3.
The bottom frame profile 2a_bo comprises a profile surface 2a_S1 that faces and abut/borders the first frame opening FO1 and a second surface 2a_S2 that faces away from the first frame opening FO1 and faces towards the bottom profile 2b_b1 of the fixation frame.
The profile surface 2a_S1 comprises an outer extremity 2a_S1e which faces the first frame opening FO1.
A gasket, such as a resilient gasket 26 is placed between the frame profile 2a surface 2a_S3 and the glass unit 3. This gasket may abut the outer major surface 3su2 of the glass unit 3 that faces towards the interior INT of the building, In the example of fig. 1, the further glass sheet 3c comprises this glass sheet surface 3su2.
The frame profile 2a surface 2a_S3 extends between the profile surfaces 2a_S1 and 2a_S2 and may comprise one or more recesses and/or protrusions for receiving e.g. gaskets, for holding members 13, covers, supports 15, 19 and/or the like.
In fig. 1, the first projecting glass sheet portion 3p1 overlaps the width W2 of the further structural bottom profile 2b_bo. The first projecting glass sheet portion 3p1 may partly or fully overlap the further structural bottom profile 2b_bo. In other embodiments, the first projecting glass sheet portion 3p1 may stop/be terminated at a location so that it does not overlap the width W2 of the further structural bottom profile 2b_bo.
As illustrated in fig. 1 and other figures described in more details further below, at least one insulating gap, in fig. 1 the evacuated gap 4, is arranged between a major surface 3a1 of the exterior glass sheet 3a and a major surface 3b1 of a glass sheet 3b of the vacuum insulated glass unit 3 which is adjacent to the exterior glass sheet EGS of the vacuum insulated glass unit 3. The major surface 3a1 faces towards the building interior INT.
The first projecting glass sheet portion 3p1 overlaps the bottom profile 2b_bo of the fixation frame 2b. The roof window may comprise a cladding member 13 for water tightening at the roof window bottom. The cladding member 13 comprises a covering part 13b which is configured to provide water tightening at the bottom BO part of the roof window 1.
The covering part 13b extends in a direction away from a plane PL1 which comprises a major exterior surface 3su1 of a glass sheet of the vacuum insulated glass unit to a position opposite the exterior of the fixation frame so as to overlap a part of the fixation frame 2b.
The cladding member 13 comprises a connection part 13a.
The covering part 13b and in some embodiments also at least a part of the connection part 13a may in some embodiments be visible from the outside of the window when the movable frame 2a is in a closed position.
In fig. 1, the connection part 13a overlaps the first projecting glass sheet portion 3p1. In some embodiments, the connection part 13a may additionally or instead overlap an extension 18 (the extension 18 is not illustrated in fig. 1, see figures described further below).
In fig. 1, the connection part 13a extends in between the fixation frame 2b and the first projecting glass sheet portion 3p1. As described in more details further below, the connection part 13a may be attached to the glass unit 3 and/or the movable frame 2a, e.g. by means of an adhesive and/or by means of one or more mechanical fasteners. The covering part 13b moves together (see figs. 2A-2B) with the movable frame 2a when it is opened.
In some embodiments, the connection part 13a is unitary with the covering part 13b. The cladding member 13, such as the connection part 13a and/or covering part 13b, may comprise or consist of a sheet material, such as a metal sheet material, such as comprising aluminium, iron or steel, or a polymer sheet material. The sheet material may comprise one or more bends, welds, soldering and/or the like to shape the cladding member. The sheet material may be structurally hard so as to not deform if subjected to outer forces such as e.g. wind, rain, snow or the like. The sheet material comprising the cladding member 13 (and/or possibly also other parts 15, 19, 18) may have a thickness between 0.5 mm and 2 mm, such as between 0.5 mm and 1.3 mm, such as between 0.7 mm and 1.0 mm.
The top cover 24 overlaps the movable frame 2a and/or the glass unit. In fig. 1, the top cover overlap both the movable frame 2a and a top part of the exterior major surface 3su1 of the vacuum insulated glass unit 3. The top cover may e.g. comprise a sheet material, such as a metal sheet material, such as comprising aluminium, iron or steel, or a polymer sheet material. The sheet material of the top cover may comprise one or more bends, welding and/or solder provided in order to shape the top cover. The top cover 24 is attached to the fixation frame 2b by means of an adhesive and/or one or more mechanical fasteners such as comprising screws, clamps, pop rivets, soldering or welding and/or the like. The upper part of the movable frame 2a may move away from the top cover 24 (see also fig. 2B) when the movable frame 2a is moved to an open position.
In fig. 1, the roof window comprises a step support 15 configured to support the first projecting glass sheet portion 3p1. The step support 15 is placed between the first projecting glass sheet portion 3p1 and the frame profile 2a. The step support 15 is attached to a bottom profile 2a_bo of the movable frame 2a. This attachment of the step support 15 may be obtained by means of one or more adhesives and/or by means of one or more mechanical fasteners such as pop rivets, clamps, hooks, screws and/or the like (not illustrated in fig. 1).
In fig. 1 and several of the figures described below, one or more supports 15 is/are placed between the first projecting glass sheet portion 3p1 and a surface 2b_boa, 2a_boa of one or both bottom profiles 2a_bo, 2b_bo facing the first projecting glass sheet portion 3p1.
The step support 15 is configured to support the first projecting glass sheet portion 3p1 at least when the movable frame 2a is in a closed position. The step support 15 may be configured to support the first projecting glass sheet portion 3p1 also when the movable frame 2a is in an open position. The step support 15 transfers impacts acting on the first projecting glass sheet portion to the frame and may hence provide a solution that is less likely to break, e.g. in case of hail storms or if other foreign objects strikes the first projecting glass sheet portion 1b.
The step support 15 or supports (more than one support may in some embodiments be present, see e.g. 15a, 15b of fig. 10) may be attached to the first projecting glass sheet portion 3p1, such as by means of one or more an adhesives and/or mechanical fasteners. This attachment may be provided directly between the step support 15 and the glass sheet portion 3p1, or through one or more intermediate members, such as comprising e.g. an extension support (described in more details later on), a connection part 13a of a cladding member 13 and/or the like.
In fig. 1, the connection member 13a and the step support 15 may be different parts. Here, the connection member 13a extends in between the step support 15 and the projecting glass sheet part 3p1. These parts 13a, 15 may be attached to each other.
In some embodiments, as also illustrated in one or more figures described further below, see e.g. fig. 12 and figs. 2A-2B, the cladding member 13 and the support or supports 15 for supporting the projecting glass sheet portion 3p1 may be integrated in the same part. In some embodiments, the cladding member 13 and the step support or supports 15 for supporting the projecting glass sheet portion 3p1 may be a unitary part part.
Fig. 1 also illustrates (see also figs 2A-2B) that the movable frame 2a comprises a water protection gasket member 14 that may extend from a position between the cladding member 13 and the exterior glass sheet EGS, and to a position at the bottom profile 2a_bo of the movable frame 2a. In fig. 1, this gasket 14 extends in between the second outer surface 3su2 of the glass unit 3 and the surface 2a_S3 facing the second outer surface 3su2. Hence the gasket 26 that is placed between the glass unit and the frame profile 2a_bo is integrated with the gasket member 14 between the first projecting glass sheet portion and the fixation frame 2b profile 2b_bo. The gasket 26 may extend over substantially the full width W1 of the movable frame 2a bottom profile 2a_bo and moreover over a part of or the full width W2 of the fixation frame where it provides gasket member 14.
The gasket 26 and the gasket member 14 may also be separate gaskets in other embodiments of the present disclosure.
It is generally understood that the edge (3a_be, 3a_te, 3a_se, 3b_be, 3b_te, 3b_se, 3c_be, 3c_te, 3c_se, 3d_be, 3d_te, 3d_se) surfaces described above and/or below and/or which are illustrated in the various figured described herein may extend between major surfaces 3a1, 3a2, 3b1, 3b2, 3c1, 3c2, 3d1, 3d2 of the respective glass sheet 3a, 3b, 3c, 3d.
Figs. 2A-2B illustrates schematically a cross section of a bottom part BO of a roof window 1, such as a centre hung roof window type or a top hung roof window type, according to embodiments of the present disclosure.
As can be seen in fig. 2A, covering part 13b extends in a direction away from a plane PL1 which comprises a major exterior surface 3su1 of a glass sheet of the vacuum insulated glass unit 3, to a position opposite the exterior of the fixation frame so as to overlap a part of the fixation frame 2b. This is when the movable frame 2a is in a closed position POS1. This provides water tightening at the window bottom BO.
The roof window 1 may comprise a water tightening gasket 28 at the bottom BO, and the covering member 13b may comprise this 28 or engage with it 28 in the closed position POS1. This gasket solution 28 may e.g. be arranged between the covering part of the movable frame/unit 2a, and a fixed cladding member 29 that is attached to the fixation frame 2b. See also fig. 37.
As can be seen in fig. 2A, covering part 13b extends in a direction away from a plane PL1 which comprises a major exterior surface 3su1 of a glass sheet of the vacuum insulated glass unit 3. As the movable frame 2a is here in an open position POS2, the covering part 13b of the cladding member 13 does not longer extend to a position opposite the exterior of the fixation frame 2b.
As can be seen in fig. 2A, the exterior surface 3su1 of the vacuum insulated glass unit 3 may in some embodiments be configured to be arranged above an exterior second plane PL2 defined by a flashing 22 of the roof window 1 and/or defined by the roof structure 50, such as a roofing material 51 (see e.g. fig. 3), when the roof window 1 is installed in a roof structure 50 of the building and the movable frame/unit 2a is in a closed position POS1.
As can be seen in fig. 2A-2B, the angle between the second plane PL2 and the first plane PL1 may change when the movable frame 3a is opened.
In fig.1 and 2A-2B, The gasket member 14 also extends in between the cladding member 13 of the movable frame 2a and the fixed cladding member 29 of the fixation frame 2b.
The water protection gasket member in figs. 1-2B also comprises the resilient gasket 26.
The gasket(s) 14 and/or 26 may be resilient gaskets, such as rubber gaskets, e.g. made from natural and/or synthetic rubber, silicone and/or the like.
Fig. 3 illustrates schematically a roof window according to embodiments of the present disclosure, installed in a building roof structure 50, seen from the outside.
The building roof structure 50 comprises a roofing 51. The roofing 51 may comprise one or more of roof shingles, roof tiles, roofing felt/asphalt roofing, metal plates, fibre plates corrugated plates and/or the like. The roofing/ roofing material 51 acts as the primary, exterior weather shield at the building roof and is subjected to rain, snow, sunlight, hails, wind and/or the like. The roofing material 51 may e.g. be attached to a structural roof structure such as roof battens or the like, see e.g. fig. 21.
The first projecting glass sheet portion 3p1 here overlaps, in this embodiment, both the bottom profile 2a_bo of the movable frame 2a, and the bottom profile 2b_bo of the fixation frame. These bottom profiles 2b_bo, 2a_bo are dashed as they may not be visible from the outside, e.g. due to an enamel (various embodiments hereof are described in more details further below) configured to hide frame components/parts, edge sealings of the glass unit 3 and/or the like so that they are not visible through the glass unit 3 from the outside.
It can also be seen that the roof window 1 has a width direction WD extending between roof window sides SI1, SI2, and a height direction HD, where the height direction extends perpendicular to the width direction WD between window top TO and window bottom BO.
The roof window may comprise water tightening elongated side water covers 21a, 21b which overlap the major exterior glass sheet EGS surface 3su1 of the vacuum insulated glass unit.
The roof window in fig. 3 is of the centre hung type. The side water covers 21a, 21b in this example therefore comprises first side water covers 21b, comprising lower side water covers, attached to the movable frame 2a and/or insulating glass unit 3. When the movable frame is moved towards the open position, the first side water covers 21b moves together with it. The roof window moreover comprises second side water covers 21a, comprising upper side water covers, attached to a fixation frame 2b of the roof window 1. The second side water covers 21a may be fixed to and unmovable relative to, the fixation frame 2b when the movable unit 2a is opened. When the movable frame is in a closed position (see fig. 2A), the first and second side water covers 21a, 21b may be arranged in continuation of each other.
The elongated side water covers 21a, 21b are longitudinal and extends in the height direction HD. The elongated side water covers 21a, 21b may overlap a side frame profile 2b_s of the fixation frame 2b. The elongated side water covers 21a, 21b may also overlap a side frame profile 2a_si of the movable frame 2a.
The elongated side water covers 21a, 21b may e.g. be made from or comprise a metal plate, a polymer plate and/or the like that acts as a water cover and may also be resistant in order to act as a shield against outer forces.
The roof window flashing 22 is arranged to guide e.g. rainwater onto the roofing material 51 of the building roof structure 50.
Fig. 4 illustrates schematically an embodiment of the present disclosure wherein one or more glass sheets 3a, 3b are arranged between the exterior glass sheet EGS and the lamination layer 3c, 6 and comprises a second projecting glass sheet portion 3p2. The second projecting glass sheet portion 3p2 projects beyond the lamination layer 3c, 6. In fig. 4, the second glass sheet 3b comprising the major surface 3b1 facing the evacuated gap and on which support structures 5 support, is the glass sheet comprising the second projecting glass sheet portion 3p2. This is in fig. 4 illustrated at the roof window bottom BO. Here, the second projecting glass sheet portion 3p2 projects beyond a bottom edge 6e of the lamination interlayer 6 at the bottom BO of the roof window. It may also, as illustrated, project beyond a bottom edge 3c_be of the further glass sheet/lamination glass sheet 3c. In further embodiments, this may additionally or alternatively be provided at sides and/or at the top TO of the roof window, so that one or more glass sheets 3a, 3b arranged between the exterior glass sheet EGS and the lamination layer 3c, 6 and comprises a projecting glass sheet portion projecting beyond the lamination layer 3c, 6 at sides and or top TO of the window 1.
The lamination layer interlayer 6 (6a) and/or the lamination glass sheet 3c may though still be configured to at least partly overlap a bottom frame profile 2a of the frame 2 as illustrated. The gasket 26 is placed between the frame profile 2a_bo and the lamination layer 6, 3c.
As illustrated, the edge seal 9 may not be overlapped by the lamination layer 6, 3c. Hence, in fig. the glass unit may comprise a double step solution where the first projecting glass sheet portion 3p1 projects beyond the edge 3b_be of the second glass sheet 3b, and both the exterior glass sheet EGS and the second glass sheet extends beyond the edge 6e, 3c_be of the lamination layer 6, 3c.
It is noted that if the glass unit 3 comprises a third glass sheet 3d and a further insulating gap 7 (not illustrated in fig. 4, various embodiments hereof are described further below), the third glass sheet 3d may or may not project beyond the edge 6e, 3c_be of the lamination layer 6, 3c.
Fig. 5 illustrates schematically an embodiment of the present disclosure, wherein a gripping member 8a of a mechanical fastening part 8 (one or more 8 may be provided) extends in between glass sheets of the vacuum insulated glass unit 3 so as to provide a fixation of the vacuum insulated glass unit 3 to the frame 2, such as to the movable frame 2a. The mechanical fastening part 8 may be made from e.g. metal and/or plastic, and the gripping member 8a may clamp the glass unit 3 to the frame 2a. In fig. 5, the gripping member 8a extends in between the exterior glass sheet EGS and the lamination glass 3c sheet, and holds onto the lamination glass 3c. In some embodiments (not illustrated) it 8a may also hold onto, such as be attached to, the interlayer 6. In fig. 5, the one or more mechanical fastening parts 8 are arranged to hold at the bottom of the glass unit at the window bottom BO. Additionally or alternatively, a similar solution may be provided at sides and/or top TO of the window 1.
As also illustrated in fig. 5, and in figs 1-2B, the roof window 1 may comprise tightening gaskets 31 configured to provide tightening, such as water- and/or air tightening between the movable frame 2a and fixation frame 2b. These 31 may be resilient and be deflected by one or both frames 2a, 2b when the movable frame 2a is closed.
Fig. 6 illustrates schematically an embodiment of the present disclosure, wherein the vacuum insulated glass unit 3 comprises a protection sealing 11, The protection sealing covers the edge seal 9, such as a solder edge seal, such as a glass solder edge seal or metal solder edge seal, enclosing the evacuated gap 4. The first glass sheet 3a, such as the first projecting glass sheet portion 3p1 overlaps the protection sealing 11. The protection sealing 11 may be a resilient, water tightening sealing. For example, the sealing may comprise a butyl sealing, a rubber sealing, a polymer sealing and/or the like. The sealing may or may not adhere to one or more surfaces, such as the major surface 3a1 of the first glass sheet 3a that also faces the evacuated gap 4, a surface, such as the edge 3b_be surface of the second glass sheet 3b, a surface of the edge sealing 9 and/or the like. The protection sealing 11 protects the edge seal 9 from being exposed to water and may in some embodiment provide a substantially hermetic seal to protect the edge seal 9. The first overlapping portion 3p1 may help to provide further protection of the edge seal 9.
In some embodiments, an enamel layer 12 may (not illustrated in fig. 6, see below, see also fig. 20) or may not, be placed between the protection sealing 11 and the glass sheet 3a.
The protection sealing 11 may in some embodiments e.g. comprise a silicone seal, a butyl seal and/or the like.
Fig. 7 illustrates schematically an embodiment of the present disclosure, where an enamel layer 12 provides a hiding feature. Here, the vacuum insulated glass unit 3 comprises an enamel layer 12, such as an enamel layer 12 which is substantially opaque to at least visible light. The enamel layer 12 covers, such as is applied to, a surface 3a1, 3p1s of the exterior glass sheet EGS, which in this embodiment is the first projecting glass sheet 3a. In other embodiments, if another glass sheet than the first glass sheet 3a is the exterior glass sheet, the enamel layer 12 may cover, such as be applied to, this glass sheet instead.
The enamel layer 12 covers a major surface of the first projecting glass sheet portion 3p1. In this embodiment, that covered surface is part of / comprised in the major surface 3a1, 3d1 of the exterior glass sheet EGS configured to face towards the interior INT of the building when the roof window is installed in a building roof structure 50.
The enamel may provide a masking.
The enamel layer 12 may be visible through the exterior glass sheet EGS from the outside/exterior EXT of the roof window 1 but may hide further parts of the roof window as it is opaque. In some embodiments, the enamel 12 may, in combination with the gasket 26, 14 described above, hide the frame and/or other parts of the roof window when looking though the exterior glass sheet from the exterior EXT of the building. The enamel 12 may not cover the full width W1 (see fig. 1) of the frame profile of the movable frame 2, but the part of the frame profile 2a_bo that is not covered by the movable frame may be covered by the gasket 26, e.g. as illustrated in fig. 7 or fig. 1-2B. a part of the gasket 26 may be visible from the exterior EXT through the glass sheet. The enamel 12 and the gasket 26 may have the same colour, e.g. a dark colour such as grey or substantially black.
The edge seal 9 is 9 is in fig. 7 placed between the enamel layer 12 and the second glass sheet 3b. This may in some embodiments provide that the edge seal 9 abuts the enamel layer 12 and may be fixed thereto. This may e.g. be provided during the VIG unit manufacturing where the enamel may be heated together with the edge seal material to a temperature above the melting point of the edge seal material 9, so that the edge seal material attach with a rigid connection to the enamel 12 material. Here, the edge seal 9 material may as previously mentioned comprise solder material providing e.g. a glass solder edge seal or a metal solder edge seal.
The enamel layer 12 covers a major surface 3p1s of the first projecting glass sheet portion 3p1 so as to hide one or more parts 13, 14, 15, 2a, 2b of the roof widow. The enamel layer 12 may cover substantially an entire major surface 3p1s of the first projecting glass sheet portion 3p1.
The enamel layer 12 may in some embodiments, as illustrated, extend into the evacuated gap 4. In fig. 7, the enamel layer 12 extends in between the first glass sheet 3a and the edge seal 9. In some further embodiments, one or more support structures 5 may support on the enamel layer 12. In other embodiments, no support structures 5 may support on the enamel layer 12. The enamel layer 12 may only partly, and not fully, overlap the profile 2a width W1 (see W1 in fig. 1).
In some embodiments, the frame 2a, 2b and/or other parts 13, 15, 19 of the roof window may be hidden by means of a combination of the enamel layer 12 and a sealing gasket 26.
The enamel layer 12 may in some embodiments comprise or be made from or comprise a glass material and/or a metal oxide layer. This may be applied during manufacturing of the glass sheet.
In some embodiments, a low-e coating, if present, may be removed from the glass sheet surface where the enamel layer is to be placed, prior to applying the enamel 12 material. This low-e coating may e.g. be removed by means of laser.
The enamel layer 12 may be attached to the glass sheet surface already during hardening of the glass sheet if the glass sheet is a thermally tempered glass sheet. This enamel layer may be applied to the glass sheet and heated together with the glass sheet to a temperature above 500°C, such as above 600°C, in the hardening process of providing a thermally tempered glass sheet.
The enamel layer 12 may have a thickness below 0.15 mm, such as below 0.1 mm, such as below 0.04 mm. in some embodiments, the thickness of the enamel layer may be between 0.001 mm and 0.1 mm, such as between 0.02 mm and 0.05 mm.
Fig. 8 illustrates schematically an embodiment of the present disclosure, wherein the glass unit 3 comprises one or more low-e coatings 16a. The one or more low-e coatings 16a is illustrated by a bold line assigned ref. 16a.
The one or more low-e coatings 16a is/are arranged at a major surface 3b1 of the second glass sheet 3b facing towards the evacuated insulating gap 4.
The low-e coating(s) 16a may e.g., in some embodiments, comprise one or more silver layers and/or one or more dielectric layers. The low-e coating may be applied to the surface 3b1 that faces towards the exterior EXT of the building, faces the evacuated gap, and faces away from the interior INT of the building when the movable frame 2a (if present) is in a closed position.
In some embodiments, the one or more low-e coatings 16a, such as a low-e coating stack, may as illustrated be terminated before the edge seal 9 so as to not extend in between the edge seal 9 and the glass sheet 3b. The low-e coating 16a extends in between the support structures 5 and the glass surface 3b1.
In some embodiments, the one or more low-e coatings 16a, such as a low-e coating stack, may be terminated before the edge seal 9 so as to not extend in between the edge seal 9 and the glass sheet 3b. The low-e coating 16a extends in between the support structures 5 and the surface 3b1. The low-e coating may cover at least 90%, such as 95% or at least 98% of the surface 3b1 part facing the gap 4.
Fig. 9 illustrates schematically a further embodiment of the present disclosure, relating to a step support 15 for supporting the first projecting glass sheet portion 3p1. Here, a step support 15 comprises a support body part 15p which extends to, and is placed opposite to, a position opposite a surface 2b_boa of the bottom profile 2b_bo of the fixation frame facing the first projecting glass sheet portion. Hence, the step support 15 may provide support over a larger area of the projecting portion 3p1. The gasket 14 may in some embodiments extend between the glass sheet portion 3p1 and the bottom frame profile 2b_bo, such as between the step support 15 and the bottom frame profile 2b_bo.
The step support 15 body is attached to the frame profile 2a_bo of the movable frame 2a and extend therefrom to the placed between the first projecting glass sheet portion 3p1 and a surface of the bottom profile of the fixation frame. 2b_bo facing the first projecting glass sheet portion 3p1.
As also mentioned previously, the step support 15 may be attached to the first projecting glass sheet portion 3p1, such as by means of one or more adhesives 33 and/or mechanical fastener(s) (not illustrated).
Fig. 10 illustrates schematically an embodiment of the present disclosure where two supports 15a, 15b are provided. A first step support 15a is placed between the projecting portion 3p1 and the surface of the profile 2b_bo of the fixation frame 2b facing the projecting portion 3p1. Another step support 15b is placed between the movable frame 2a bottom profile 2a_bo and the projecting portion 3p1.
It is generally understood that in some embodiments, the support(s) 15, 15a, 15b may be attached to the first projecting glass sheet portion 3p1, such as by means of one or more adhesives 33 and/or mechanical fastener(s) (not illustrated). In some embodiments the adhesive(s) 33 may comprise a tape and/or a glue.
Fig. 11 illustrates an embodiment where a step support 15 is placed between the fixation frame and the projecting glass sheet portion 3p1, and which does not extend to a position opposite a surface of the frame profile 2a_bo facing the glass sheet.
Fig. 12 illustrates an embodiment of the present disclosure, wherein one or more of the one or more supports 15, 15a, 15b comprises one or more resilient support elevations 17. The resilient support elevations 17 may or may not comprise discretely arranged support elevations. In some embodiments, the support elevation(s) may be provided by means of an adhesive (see e.g. 33a. 33b of fig. 38) adhering the glass sheet portion 3p1 to a step support 15 body, such as a polymer body or metal body, such as comprising aluminium, iron and/or steel.
In some embodiments, the support elevation(s) 17 may additionally or alternatively be provided by or comprise one or more resilient gaskets attached to the step support 15 body. This/these gaskets may comprise a rubber material, a silicone material, a butyl material and/or the like.
The support elevation 17(s) may e.g. act as a damper for damping harming effects of sudden strikes from foreign objects acting on the projecting glass sheet portion 3p1.
Fig. 12 moreover illustrates an embodiment of the present disclosure where the step support comprises an attachment part 35 which is attached to the bottom profile 2a_bo of the movable frame 2a so that the step support 15 is carried by the profile 2a_bo.
In fig. 12, the step support and the cladding member comprising the covering part 13b are integrated, and the cladding member 13 is thereby also carried by the movable frame 2a.
Figs. 13-17 illustrates schematically various embodiments of the present disclosure, wherein an extension 18 is arranged in continuation of the bottom of the exterior glass sheet 3a EGS and extends with an extension distance DIS2. See moreover e.g. figs. 31 and 34 an extension 18 according to various embodiments of the present disclosure.
The extension 18 is arranged opposite to the bottom edge 3a_be of the exterior glass sheet 3a, EGS, and is arranged in in continuation of the exterior glass sheet. The exterior surface 18a of the extension 18 may help to provide an impression of a continuous, larger exterior surface 3su1 of the exterior glass sheet EGS surface 3su1.
The exterior surface 18a of the extension may be substantially flush with the exterior major surface 3a2, 3su1 of the exterior glass sheet EGS which is configured to face away from the interior INT of the building. This is in fig. 13 illustrated by that the plane PL1 comprises both the exterior surface 18a of the extension (which may be a major surface of the extension 18) and the exterior major surface 3a2 of the exterior glass sheet 3a.
In some embodiments, the extension surface 18a may be flush with the surface 3su1 over at least 1 cm, such as at least 3 cm or at least 5 cm from the exterior glass sheet bottom edge 3a_be.
In some embodiments, the extension surface 18a may vary with on more than ±5 mm, such as no more than ±3 mm, such as no more than ± 1 mm from the plane over at least 1 cm, such as at least 3 cm or at least 5 cm from the exterior glass sheet bottom edge 3a_be surface.
In some embodiments of the present disclosure, the exterior, visible surface 18a of the extension 18 may be arranged with a distance of less than 8 mm, such as less than 5 mm, such as less than 2 mm, from the plane PL1 comprising the exterior major surface 3su1 of the exterior glass sheet EGS of the vacuum insulated glass unit 3.
In some embodiments of the present disclosure, the exterior, visible surface 18a of the extension 18 may be substantially flush with the exterior surface 3su1 of the exterior glass sheet EGS, 3a, 3d, at least proximate a bottom edge 3a_be, 3d_be of the exterior glass sheet EGS. Alternatively, in some embodiments of the present disclosure, the exterior, visible surface 18a of the extension 18 is arranged below the plane PL1 comprising the exterior major surface 3su1 of the exterior glass sheet EGS of the vacuum insulated glass unit 3, at least proximate a bottom edge 3a_be, 3d_be of the exterior glass sheet EGS, 3a, 3d. This may be provided in order to reduce or avoid water to be captured at the transition between the extension 18 and the exterior glass sheet.
In some embodiments, the surface 18a may be substantially parallel with the plane PL1. In some embodiments, the surface 18a may vary within ± 5°, such as within ± 3°, such as within ± 1°, relative to the plane PL1 comprising the exterior surface 3su1 of the exterior glass sheet EGS.
The surface of the extension 18a may be substantially plane. Alternatively, it may comprise a slight, intended curvature, such as a convex curvature in the direction away from the bottom edge of the exterior glass sheet.
In some embodiments, the visible surface 18a of the extension 18 that can be seen from the outside of the building when the movable frame 2a is in a closed position may be provided by a glass sheet, a metal sheet and/or a polymer sheet.
In fig. 13, the extension 18 comprises an extension body 20. The extension body 20 provides and/or comprises the exterior surface 18a of the extension 18. The extension body 20 is supported by, such as carried by, an extension body support 19. The extension body 20 is attached to the extension body support 19.
The extension body 20 may or may not be structural, such as may or may not contribute to the structural integrity of the extension 18.
In some embodiments, an extension body 20 may comprises one or more functional parts. In some embodiments hereof, the one or more functional parts may comprise one or more electric circuitries and/or electric components. In some embodiments, the one or more functional parts may be configured to provide an output such as an electric output, such as measurement and/or sensor output, an electric power supply output and/or the like.
In some embodiments, the extension body 20 may comprise or be a photovoltaic module. The photovoltaic module may be configured to charge a rechargeable battery of an actuator (not illustrated) such as a chain actuator or a piston actuator configured to open and/or close the movable frame. In other embodiments, the actuator may comprise an electric motor for driving a window covering such as a blind or shutter and/or the like.
The rechargeable battery may additionally supply e.g. radio communication circuitry, data processors and/or the like arranged at the roof window, e.g. in relation to control of the actuator by means of radio signals or the like from a hand held remote control device and/or from a central controller.
In some embodiments of the present disclosure, the extension body 20 may comprise one or more sensors such as comprising a rain sensor, a light sensor, a temperature sensor and/or a humidity sensor.
Generally, in various embodiments of the present disclosure, the extension body support 19 may be an integrated part of a cladding member 13 as e.g. previously described. Additionally or alternatively, the extension body support 19 may be an integrated part of a step support 15 as e.g. previously described.
In e.g. fig. 13, the extension 18 comprises the extension body support 19 which provides a structural, mechanical holding part for holding the extension body 20.
In one or more embodiments of the present disclosure, the extension body support 19 may (as e.g. illustrated in various figures which are described in this document) comprise a wall such as a plate. In some embodiments, the extension body support 19 may comprise a polymer sheet wall/plate or a metal sheet wall, for example comprising one or more of aluminium, iron or steel. The extension body support 19 wall may in some embodiments have a thickness between 0.2 mm and 1.5 mm, such as between 0.2 mm and 1.2 mm, such as between 0.3 mm and 0.9 mm.
It is understood that in some embodiments, an enamel layer which is substantially opaque to at least visible light may cover, such as be applied to, a surface of the extension body 20. This is however not illustrated. In some embodiments, the enamel may be substantially identical to the enamel layer 12 as previously described. In some embodiments hereof, the enamel layer 12 may be placed between the extension body 20 and an extension body support 19.
In fig. 13, the extension body 20 is supported by, such as carried by, a cladding member 13 of the roof window 1 which comprises the extension body support. In this embodiment, the extension body support 19 is an integrated part of a member, such as a profile, comprising the cladding member 13 and also an integrated part of a step support 15. It is however understood that in some embodiments, one or both of the cladding member 13 and/or step support 15 may be separate to the extension body support 19.
Fig. 13 moreover illustrates a further embodiment of the present disclosure where the extension body support 19 is attached to the bottom profile 2a_bo of the movable frame 2a so that the extension 18 is supported by the movable frame 2a, such as carried by the movable frame 2a. This is in fig. 13 provided by means of one or more fasteners 34 such as mechanical fasteners.
The extension body support 19 comprises an attachment part 35. This attachment part 35, such as a plate and/or a bracket/mounting, is attached to the frame profile 2a_bo by means of the one or more mechanical fasteners 34. The one or more mechanical fasteners 34 may comprise one or more of screws, nails, clips, clamps and/or pop rivets. The fastener(s) 34 may be releasable so that the extension body support 19 may be detached from and attached to the movable frame 2a one or more times. In some embodiments, the mechanical fasteners(s) 34 may be reused in this process.
One or more holes, recesses and/or protrusions may be provided in, such as integrated in, the attachment part 35 for receiving and/or providing one or more mechanical fasters.
In some embodiments, the extension body support 19 may comprise one or more installation guides 36. The installation guides may enable a user to faster and/or easier install the extension body support 19 precisely at the roof window, such as at the roof window profile. In fig. 13, the installation guide 36 is integrated in the extension body support 19. In fig. 13, the installation guide 36 comprises a protrusion for supporting on the bottom profile 2a_bo surface and thereby assure that the user attach the fastener(s) 34 at the correct location.
Guide 36 may additionally or alternatively be provided in cladding member and/or step support.
The installation guide 36 may in some embodiments also provide support for supporting the glass unit 3a. This is in fig 13 provided as the extension body support 19 also acts as the step support 15 and supports the first projecting glass sheet portion 3p1.
Fig. 13 moreover illustrates a further embodiment wherein a sealing 37, such as a silicone material, a butyl material and/or the like is arranged between the bottom edge 3a_be surface of the exterior glass sheet EGS and the extension body 20. This may e.g. prevent water from entering in between the glass sheet EGS and the body 20. The sealing 37 may or may not comprise an adhesive feature so as to adhere to the glass sheet EGS and/or the body 20. The sealing 37 may or may not abut the body 20 and glass sheet EGS. In fig. 13, the sealing 37 abuts the extension body 20 and the glass sheet EGS
Fig. 14 illustrates an embodiment of the present disclosure wherein the extension 18 is supported by, such as mainly carried by, the vacuum insulated glass unit 3. In fig. 14, the extension 18 is supported by, such as mainly carried by, the first projecting glass sheet portion 3p1. This may e.g. be provided by means of an adhesive which adheres the extension 18, such as the extension body 20 support 19, to the first projecting glass sheet portion 3p1 at the side of the first projecting glass sheet portion 3p1 facing towards the building interior INT. Even though not illustrated in fig. 14, the extension body 20 support 19 may also comprise a cladding member 13, see e.g. 15.
It is generally understood that according to various embodiments of the present disclosure (See e.g. figs. 13 and 16-17), the extension 18 may comprises a cladding member 13. This cladding member 13 is also described in more details above. The cladding member 13 comprises a covering part 13b which is configured to provide water tightening at the bottom BO part of the roof window 1. In some embodiments, the cladding member 13 may comprise the extension, such as the extension body support 20, or vice versa. I.e. the same member of the roof window may provide several features such as one or more of the cladding member 13, the step support 15 and/or a part 18, 19 of the extension 18.
Fig. 15 illustrates an embodiment of the present disclosure wherein the extension body 20 is omitted and the extension 18 comprises an extension member 18b provided by a plate/sheet, such as a metal sheet/plate, e.g. comprising one or more of aluminium, iron or steel, and/or a polymer sheet/plate. The member 18b is arranged in continuation of the external glass sheet EGS bottom 3a_bo and provides the extension surface 18a. This surface 18a may or may not be substantially flush with the exterior glass sheet surface 2su1 This plate/sheet 18b comprises the exterior surface 18a of the extension. In some embodiments, the exterior surface 18a may be provided by a painting layer, an enamel layer and/or the like applied at the plate/sheet.
Fig. 16 illustrates an embodiment of the present disclosure wherein the extension is attached to the exterior glass sheet 3b surface 3su2 of the glass unit 3 that away from the building exterior EXT and facing away from the exterior glass sheet EGS. This surface 3su2 may e.g. be provided by means of the second glass sheet 3b, a lamination glass sheet 3c (not illustrated in fig. 16) or a further glass sheet of the glass unit 3, see e.g. ref. 3d described in more details further below.
In both figs. 15 and 16, the extension member 18b is supported by, such as carried by, the glass unit 3.
The attachment of the extension member 18b to the glass unit 3 may e.g. be provided by means of an adhesive connection.
In some embodiments, a solution as illustrated in one or more of figs. 14-16 may be combined with an extension body 20 as previously described, so that the extension body 20 is supported by the glass unit 3 through the extension member 15b, whereby the extension member 18b provides the extension body support 19.
As illustrated in figs 15-17, the extension member 18b may comprise or provide the cladding member 13 comprising a covering part 13b as e.g. previously described
Fig. 16 moreover illustrates an embodiment of the present disclosure, wherein the extension 18 is substantially unsupported by the exterior glass sheet EGS. Instead another glass sheet of the glass unit 3 supports the extension, in this case glass sheet 3b.
Fig. 17 illustrates an embodiment of the present disclosure, wherein the extension 18 is substantially unsupported by the glass unit 3. The extension 18 comprises an attachment part 35 and the extension member 18b. The extension 18 is attached to the movable frame 2a, e.g. as described above in relation to fig 13 by means of the attachment part 35. Hence, one or more fasteners 34 may attach the attachment part 35, and thereby the extension 18, to the to the movable frame 2a profile 2a_bo.
Fig. 17 illustrates a further embodiment of the present disclosure, wherein the extension member 18b comprises an installation guide 36. The installation guide 36 is configured to extend into an indentation, such as a groove or slit, in the bottom profile 2a_bo. This indentation, such as groove or slit, is in fig. 17 provided in the profile 2a_bo surface 2a_bos2 facing away from the first frame opening FO1. In other embodiments, the indentation may be arranged at another location.
See e.g. figs. 13, 17 24 28 and/or 31.
In some embodiments, the installation guide 36 may be configured to engage with one or more barbs (not illustrated) of e.g. the profile 2a_bo. The one or more barbs may help to hold the member comprising the guide 36 in place while attaching and/or manipulating the one or more fasteners 34.
It is understood that in other embodiments, one or more installation guides such as indentation(s), e.g. comprising groves, slits and/or holes, protrusions and/or the like may be arranged at the frame profile 2a and/or at the attachment part 35. This/these is/are configured to assist the user in attaching the extension member 18b as intended to the frame profile and and/or may provide structural strength.
In figs. 13-17, the extension 18, such as the extension body 20 or extension member 18b, overlaps the further structural bottom profile 2b_bo of the fixation frame 2b. This may help to provide water tightening and/or provide aesthetical advantages, e.g. by causing the impression of a larger, exterior surface 3su1 and/or a more aesthetically well integrated extension.
In some embodiments of the present disclosure, the exterior surface 18a of the extension 18 may be substantially identical and/or substantially visually identical to the exterior surface 3su1 of the first projecting glass sheet portion 3p1. The extension body 20, such as a detachable/replaceable extension body 20, or the extension member 18b comprises the surface 18a.
In some embodiments of the present disclosure, the extension body 20 may comprise a glass sheet and/or an exterior glass sheet surface 18a.
The surface 18a may be a high gloss surface that may be obtained by a glass sheet of the extension body 20, so that the surface 18a reminds of, resembles and/or is substantially similar to, the surface characteristic of the exterior surface 3su1.
In some embodiments, such a high gloss surface 18a may also be obtained by a paint, enamel or the like applied onto the extension member 18b, if the extension body 20 is omitted. In other embodiments, the surface 18a may not remind of the surface characteristic of the exterior surface 3su1 of the exterior glass sheet EGS. However, the exterior extension surface 18a may still be substantially flush with the surface 3su1 of the exterior glass sheet EGS. The exterior extension surface 18a is generally visible from the outside EXT of the window 1.
In some embodiments of the present disclosure, first projecting distance DIS1 may be no more than 100 mm, such as no more than 60 mm, such as no more than 30 mm, such as no more than 25 mm.
The distance DIS 1 may be at least 6 mm such as at least 10 mm, such as at least 45 mm.
In some embodiments, the first projecting distance DIS1 may be no more than 55 mm, such as no more than 45 mm, such as no more than 30 mm.
In some embodiments of the present disclosure, the extension distance DIS2 as e.g. illustrated in figs 13-17 may be at least 6 mm, such as at least 10 mm, such as at least 20 mm or at least 50 mm.
In some embodiments of the present disclosure, the extension distance DIS2 may be no more than 300 mm, such as no more than 200 mm, such as no more than 80 mm or no more than 40 mm.
In some embodiments of the present disclosure, the sum DIS1+DIS2 of the extension distance DIS2 and the first projecting distance DIS1 may be at least 20 mm, such as at least 30 mm, such as at least 60 mm or at least 75 mm.
In some embodiments of the present disclosure, the sum DIS1+DIS2 of the extension distance DIS2 and the first projecting distance DIS1 may be between 35 mm and 400 mm, such as between 45 mm and 250 mm, such as between 55 mm and 120 mm.
The extension distance DIS2 may in some embodiments of the present disclosure be larger than the first projecting distance DIS1. In some further embodiments hereof, the extension distance DIS2 may be at least 20% larger, such as at least 50% larger, such as at least 100% larger than the first projecting distance DIS1. In some embodiments the extension distance DIS2 may be between 20% and 200% larger than the first projecting distance DIS1, such as between 50% and 100% larger than the first projecting distance DIS1.
In other embodiments, the extension distance DIS2 may be smaller than or substantially equal to the first projecting distance DIS1.
It is generally understood that e.g. the distance DIS1 and/or DIS2 as described above and/or below may extend substantially in the height direction HD (see e.g. fig. 3 and 33) of the roof window 1.
It is generally understood that e.g. the distance DIS1 and/or DIS2 as described above may extend substantially parallel to the longitudinal direction (between top and bottom of glass unit) of the side edges 3a_se, 3b_se of the glass sheets of the vacuum insulated glass unit (see e.g. fig. 18 and 33) of the roof window 1.
The extension member 18b illustrated in e.g. figs. 15-17 is provided by a plate/sheet, such as a polymer sheet/plate and/or a metal sheet/plate. The extension member 18b comprises the visible extension surface 18a facing away from the building interior INT and which is subjected to weather such as rain and sunlight when the roof window is installed in the building roof structure 50. The extension member 18b is structural so as to provide or support the structural integrity of the extension 18.
It is generally understood that the extension 18 may comprise an elongated, structural profile 19, 18b, such as a metal profile, providing the structural integrity of the extension 18. In some embodiments hereof, the elongated, structural profile 13, 15, 19, 18b may comprises a metal sheet having a thickness between 0.5 mm and 2 mm, such as between 0.5 mm and 1.3 mm, such as between 0.7 mm and 1.0 mm.
In some embodiments, the part 19, 18b, such as the structural part, of the extension comprising the visible surface 18a of the extension that can be seen from the outside of the building when the movable frame 2a is in a closed position may comprise one or more of a glass sheet, a metal sheet and/or a polymer sheet.
Fig. 18 illustrates an embodiment of the present disclosure wherein the exterior glass sheet EGS, in this case glass sheet 3a, comprises one or more third projecting glass sheet portions 3p3 which projects beyond a side edge 3b_se of the adjacent glass sheet 3b with a second projecting distance DIS3. This in fig. 18 the case at both sides SI1, SI2 of the roof window 1.
The glass unit 3, including a part of the evacuated gap 4, overlaps both side profiles 2a_si of the movable frame 2a placed at opposite sides of the first frame opening FO1. The side edge 3b_se is however terminated before the side edge 3a_se of the exterior glass sheet EGS, 3a is terminated, so that the side of the exterior glass sheet projects with the distance DIS3 beyond the second glass sheet edge 3b_se at the roof window 1 sides SI.
The second projecting distance DIS3 may in embodiments of the present disclosure be at least 5 mm, such as at least 10 mm, such as at least 25 mm, such as at least 40 mm.
In some embodiments of the present disclosure, the second projecting distance DIS3 may be no more than 30 mm, such as no more than 25 mm.
In some embodiments of the present disclosure, the second projecting distance DIS3 is smaller than the first projecting distance DIS1 at the roof window bottom BO.
In other embodiments of the present disclosure, the second projecting distance DIS3 is substantially corresponding to, or larger than, the first projecting distance DIS1 at the roof window bottom BO.
If the roof window 1 is of the centre hung type, the exterior glass sheet EGS may in some embodiments be of a width that is smaller than the minimum frame opening FO2 width of the second frame opening FO2 to allow the glass unit 3 to move through the fixation frame 2b in between the side profiles 2b_si of the fixation frame 2b. If the roof window 1 is of the top hung type, and not centre hung, the exterior glass sheet EGS width may in some embodiments be larger than the second frame opening FO2 width. In that case, one or more glass sheets 2a, 2b, such as at least the exterior glass sheet EGS, may overlap the fixation frame side profiles 2b_si. In some embodiments hereof, only a part of the third projecting glass sheet portions 3p3 may overlap the fixation frame side profile(s) 2b_si, whereas one, more or all of the evacuated gap 4, edge sealing 9 and/or second glass sheet 3b may not overlap the fixation frame 2b side profiles 2b_si.
Fig. 18 moreover illustrates the embodiments of elongated side water covers 21a, 21b as previously described. These 21a, 21b overlap the exterior glass sheet EGS surface 3su1.
The side water covers 21a, 21b, in fig. 18 are configured to guide water into a side water channel 38, In the illustrated embodiment, the side water channel 38 is arranged above the projecting portion 3p3 so as to cover a part of that portion 3p3. The side water channel 38 may be attached to the glass unit 3, such as to the exterior glass sheet. This attachment may be provided by means of an adhesive and/or mechanical fasteners (not illustrated)
A first side edge surface 39a of the water covers 21a extends partly towards and/or into (as e.g. illustrated) the side water channel 38 so as to guide water from the cover 21a into the channel 38.
Side water channels 38 are arranged at each roof window side SI1, SI2. The side water covers 21a, 21b also comprises a further side edge surface 39b that guides the water towards the roof structure and away from the glass unit.
The side water channel(s) 38 may be U-shaped and comprise an elongated recessed portion for guiding water from the side cover(s) 21a, 21b towards the roof window 1 bottom BO. The side water channel(s) 38 may e.g. comprise a metal sheet material such as an aluminium or steel sheet material.
The side water covers 21a, 21b hence overlap the glass unit 3 and the fixation frame side profiles 2b_si in the width direction WD of the roof window 1.
In fig. 18, the projecting portions 3p3 at a side SI of the roof window are present. In other embodiments of the present disclosure, the projecting portions 3p3 may be omitted.
It is generally understood that in some embodiments of the present disclosure, one or more of the edge(s) of the vacuum insulated glass unit 3 arranged along the top TO, bottom BO and/or side(s) SI1, SI2 of the roof window 1 may be insulated by means of edge heat insulation (not illustrated) that is arranged opposite to, such as abuts, the edge region of the VIG unit.
In one or more embodiments of the present disclosure, the edge heat insulation comprises a heat insulating material having a thermal conductivity below $0.1 \frac{W}{mK}$ , such as below $0.05 \frac{W}{mK}$ , such as below $0.02 \frac{W}{mK}$ . In one or more embodiments of the present disclosure, the edge heat insulation comprises a heat insulating material having a thermal conductivity between $0.009 \frac{W}{mK}$ and $0.1 \frac{W}{mK}$ , such as between $0.01 \frac{W}{mK}$ and $0.05 \frac{W}{mK}$ , such as between $0.015 \frac{W}{mK}$ and $0.04 \frac{W}{mK}$ .
In one or more embodiments of the present disclosure, the edge heat insulation may overlap an edge surface of one or more glass sheets if the VIG unit, wherein said edge surface extends between major surfaces of the respective glass sheet.
In one or more embodiments of the present disclosure, the edge heat insulation extends to overlap one or more major exterior glass sheet surfaces to a position opposite the evacuated gap, so that the evacuated gap overlaps the heat insulation. This may help to further reduce cold bridge issues.
In one or more embodiments of the present disclosure, the edge heat insulation extends to a position between a frame profile of the movable frame and the vacuum insulated glass unit.
In one or more embodiments of the present disclosure, the edge heat insulation is configured to reduce heat transfer at the area of the edge seal enclosing the evacuated gap when compared to a scenario where the heat insulation is omitted.
In one or more embodiments of the present disclosure, the edge heat insulation extends from an edge seal, which encloses the further insulating gap, and to a frame profile of the frame. This may provide improved heat insulation.
In some embodiments, the edge heat insulation may enclose and/or encapsulate the edge of the VIG unit.
The edge heat insulation material may in some embodiments of the present disclosure comprise one or more of

a foam insulation, such as a polymer foam insulation, such as comprising polystyrene foam insulation and/or polyurethane foam insulation,
wool insulation, such as mineral wool insulation
an insulation material comprising aerogel,
natural fibre insulation, such as comprising one or more of wood fibres, hemp fibres, cotton fibres and/or flax fibres
an extrudable insulation material such as comprising a thermoplastic insulation material
EPDM (ethylene propylene diene) rubber, such as EPDM (ethylene propylene diene monomer) rubber or an/another thermoplastic material.

The edge heat insulation may be configured so as to reduce heat transfer at the area of the edge seal 9 enclosing the evacuated gap 4 when compared to a scenario where the edge heat insulation is omitted.
Fig. 19 illustrates schematically an embodiment of the present disclosure, wherein the exterior glass sheet EGS is smaller than the adjacent glass sheet at the roof window top TO.
In this embodiment, the glass sheet 3b adjacent to the exterior glass sheet 3a EGS, comprises a fourth projecting glass sheet portion 3p4. This fourth projecting glass sheet portion 3p2 projects beyond the edge 3a_te of the exterior glass sheet 3a, EGS at the top TO of the roof window. This causes a step at the top of the glass sheet. A water channel 43 may in some embodiments be arranged at said step and. In other embodiments, such a water channel 43 may be omitted.
A protection sealing 11 may be arranged to cover the edge seal 9 enclosing the evacuated gap 4, and this 11 may be arranged at the step. In fig. 19, the exterior glass sheet does not overlap the edge sealing protection sealing 11. In other embodiments, the edge sealing protection sealing 11 may be arranged between the glass sheets EGS, 3b enclosing the evacuated gap 4 to protect the edge seal 9, see e.g. fig. 20.
The top cover 24 of the window 1 may overlap the exterior major surface 3su1 and comprise a covering part comprising a covering surface 24a for guiding water towards the exterior glass sheet surface 3su1.This covering part may extend towards the glass sheet surface 3su1.
A top gasket 23, such as a resilient top gasket 23, may provide water tightening at the top TO between the top cover 24 and the glass unit 3. The top gasket 23, such as a rubber or silicone gasket, may be configured to deflect when the movable frame 2a is moved to the closed position (see e.g. fig. 2A). In fig. 19, the movable frame 2a is in the closed position. In fig. 19, the top gasket 23 comprises lips that abuts the water channel 43 walls. In other embodiments, it 23 may comprise one or more lips or parts that abut a glass unit 3 surface such as the exterior surface 3su1. The gasket 23 may e.g. be attached to/fixated to the top cover 24. See also fig. 25.
The top cover 24 may comprise a sheet material, such as a metal or polymer sheet material for providing a hard exterior surface/shell of the roof window 1 for mechanical protection and water protection. The top cover 24 may be attached to or integrated in the top frame profile 2b_to of the fixation frame 2b. In fig. 19, the handle 27 comprises a base part 27a extending between the top profile of the fixation frame 2b_to, and the top profile of the movable frame 2a_to. This 27a may be manipulated by means of the gripping part 27b of the handle 27, such as pivoted (not illustrated), to unlock the movable frame from the fixation frame 2b and/or to open the window.
Fig. 20 illustrates schematically a roof window 1 according to embodiments of the present disclosure, where the glass unit 3 comprises a protection sealing 11. See also fig. 6. The protection sealing 11 covers the edge seal 9 that hermetically encloses the evacuated gap 4. The protection sealing 11 is placed between major surfaces 3a1, 3b1 of the first and second glass sheet 3a, 3b. The protection sealing 11 may e.g. be or comprise a resilient, water tightening sealing, e.g. a butyl sealing 11 , a rubber or silicone sealing 11 and/or the like.
In some embodiments, an enamel layer 12 as previously described may be placed between the protection sealing 11 and the glass sheet 3a. This may e.g. be relevant if the outermost glass sheet 3a that provides a part of the enclosing of the evacuated gap 4 is the exterior glass sheet EGS, which is the case in several embodiments described above, see e.g. figs. 1-2B and other figures described above.
Fig. 21 illustrates schematically an embodiment of the present disclosure, wherein the exterior surface 3su1 of the vacuum insulated glass unit 3 facing the exterior of the building EXT is configured to be arranged below an exterior plane PL2 defined by/comprising a flashing 22 and/or a roof structure when the roof window 1 is installed in a roof structure 50 of the building.
In fig. 21, the second plane PL2 is defined by the defined by the exterior of the roofing material 51 (see e.g. fig. 3) and the roof slope. Flashing at the roof window bottom extends over the exterior of the roofing 51 surface 51a so as to guide rain water from the roof window and to the exterior surface 51a of the roofing 51.
The roofing 51 may be attached to a structural roof structure such as comprising roof battens 52.
In some embodiments, the exterior surface 3su1 may be configured to substantially be arranged in/coincide with the exterior plane PL2.
In fig. 21, a cladding member 13 may extend over a part of the fixation frame 2b through one or both planes PL1, PL2, and may comprise a covering part 13b that covers an outer surface of the fixation frame 2b, so as to guide rain water towards the flashing 22 and/or roofing material 51 (see fig. 3).
It is generally understood that the cladding 13 may help to guide rain water from the exterior glass sheet surface 3su1, over the fixation frame 2b and towards the roof structure.
The cladding member is in fig. 21 attached to the glass sheet surface 3a1 of the exterior glass sheet 3b facing towards the interior INT of the building. A seal 46 may be provided to provide water tightness between the cladding member 13 and the glass unit 3. In other embodiments, the cladding member 13 may be attached in other ways to the movable frame 2a, such as to the glass unit, e.g. to the exterior glass sheet EGS surface 3su1.
In fig. 21, the exterior major surface 3a2, 3su1 of the exterior glass sheet EGS is comprised in a first plane PL1. The first plane PL1 is configured to substantially coincide with or be arranged below (as illustrated) a second, exterior plane PL2 defined by a flashing 22 and/or roof structure (51) of the roof window 1 when the roof window is installed in a roof structure (50) of the building.
The first plane PL1 and the second plane PL2 may be configured to be substantially parallel, such as at least when the movable frame 2a of the roof window is in a closed position. Hence, the planes may be arranged with a mutual angle of less than 5°, such as less than 3° or less than 1°.
The first plane PL1 and the second plane PL2 may in some embodiments substantially coincide or be arranged so that the surface 3su1 and the roofing material 51 appears to be substantially flush or aligned.
In various embodiments of the present disclosure, as illustrated in several of the figures described above and/or below, see e.g. figs. 1-2B and 4-21, the glass unit / vacuum insulated glass unit 3 may comprise just one insulating gap 4 (the evacuated gap) arranged between exterior major surfaces 3su1, 3su2 of the glass unit 3.
Such a vacuum insulated glass unit 3 may have a U_g (U_glazing ) value of below 0.8 W/(m ² K), such as below 0.6 W j(m2K), such as below 0.5 W/(m ² K). The U_g (U_glazing ) value of such a unit 3 may be between 0.35-0.7 W/(m ² K), such as between 0.4-0.6 W/(m ² K). The U_g value may be determined at the centre of the glass unit 3 (excluding projecting glass sheets as described in this document). E.g. the U_g value may be determined at a center portion of the evacuated gap arranged where two diagonally extending lines, which extends between diagonally arranged corner portions of the edge seal
In further embodiments of the present disclosure the vacuum insulated glass unit 3 may comprise a third glass sheet 3d, wherein a a further insulating gap 7 is placed between a first major surface 3d1 of the third glass sheet 3d facing the further insulating gap 7 and a major surface 3b2, 3a2 of a glass sheet 3b, 3a of the vacuum insulated glass unit 3, which major surface faces the further insulating gap 7. Various embodiments of the present disclosure where the glass unit 3 comprises a further heat insulating 7 gap are e.g. illustrated in figs. 22 and 26-32.
Fig. 22 illustrates an embodiments of the present disclosure wherein the vacuum insulated glass unit 3 comprises a third glass sheet 3d and a further insulating gap 7.
The further insulating gap 7 is placed between a first major surface 3d1 of the third glass sheet 3d, where the surface 3d1 faces the further insulating gap 7, and a major surface 3b2 of another glass sheet of the vacuum insulated glass unit 3 which faces the further insulating gap 7. In fig. 22, the major surface 3b2 of the other glass sheet 3b, 3a of the vacuum insulated glass unit 3 which faces the further insulating gap 7 is a second major surface 3b2 of the second glass sheet 3b which faces away from the evacuated gap 4.
In fig. 22, the evacuated gap 4 provides the outermost heat insulating gap of the glass unit that placed nearest to the exterior EXT of the building. The evacuated gap 4 is placed between the exterior glass sheet EGS and the further insulating gap 7. The further insulating gap 7 is the innermost gap placed nearest to the interior INT of the building.
The second glass sheet 3b is placed between the evacuated gap 4 and the further insulating gap 7. Major, oppositely directed surfaces of the second glass sheet 3b may thus face and e.g. abut (including low-e coating if present) the further insulating gap 7 and the evacuated gap 4, respectively.
An edge seal 7a enclosed the further insulating gap 7. The edge seal 7a may comprise a primary seal and a secondary seal (not illustrated). The primary seal may be placed more proximate the gap 7a than the secondary seal. The seal 7a enclosing the further insulating gap 7 may comprise one or more of (not illustrated):

One or more desiccants
One or more spacers,
One or more seals, such as comprised in a primary seal, such as comprising one or more portions for preventing or reducing vapor penetration and/or gas loss, such as reducing argon gas loss
One or more seals, such as one or more secondary seals, that is/are configured to keep the glass sheets 3d, 3b2 together, protect the primary seal and/or prevent vapor penetration,
A silicone edge seal material, such as a silicone material comprising moisture absorbing particles

The edge seal 7a may in embodiments of the present disclosure comprise one or more materials and/or a design providing a thermal conductivity of the edge seal 7a below $0.6 \frac{W}{mK}$ such as below $0.4 \frac{W}{mK}$ .
The edge seal 7a may in embodiments of the present disclosure comprise one or more materials and/or a design providing a thermal conductivity of the edge seal 7a below $0.1 \frac{W}{mK}$ such as below $0.05 \frac{W}{mK}$ such as below $0.02 \frac{W}{mK}$ .
The edge seal 7a may in embodiments of the present disclosure comprise one or more materials and/or a design providing a thermal conductivity of the edge seal 7a between $0,009 \frac{W}{mK}$ and $0.6 \frac{W}{mK}$ , such as between $0.05 \frac{W}{mK}$ and $0.4 \frac{W}{mK}$ .
In fig. 22 and other figures described in more details below, the further insulating gap 7 is placed between the lamination layer 6, 3c and the evacuated gap 4.
The further insulating gap 7 may be a gas filled gap 7, such as a gap 7 comprising argon gas.
The third glass sheet 3d is arranged between the second glass sheet 3b and a lamination layer 6, 3c, such as comprising an interlayer 6, of the lamination layer 6, 3c.
As illustrated in fig. 22, a lamination layer 6, comprising the lamination interlayer, may be attached to a major surface 3d2 of the third glass sheet 3d.
In some embodiments of the present disclosure, one or more low-e coatings 16b is/are arranged at the first major surface 3d1 of the third glass sheet 3d and facing the further gap 7. This low-e 16b coating may (as illustrated) or may not, extend to a position between the edge seal 7a and the glass sheet surface 3d on which it is applied.
It is generally understood that when referring to a glass sheet surface in this document, this surface may also comprise one or more coatings, such as low-e coatings applied thereon, if present.
In some embodiments, one or more further low-e coatings 16a may additionally or alternatively be arranged in the evacuated gap 4, such as at the surface of the second glass sheet 3b facing the evacuated gap 4.
The first projecting glass sheet portion 3p1 may project beyond the bottom edge 3d_be of the third glass sheet 3d with the distance DIS1 .
The glass unit 3 in fig. 22 and some of the figures described below, comprising both an evacuated insulating gap 4 and a further gas filled gap 7 may be referred to as a hybrid VIG unit.
In fig. 22, the bottom edges of the glass sheets 3b, 3d, 3c are substantially aligned so that the firs projecting glass sheet portion extends beyond all three bottom edges, In other embodiments, the bottom edges of the glass sheets 3b, 3d, 3c may be displaced relative to each other so that one or more of the glass sheets 3b, 3d, 3c extends/projects beyond the bottom edge of one or more of the other two glass sheets.
Fig. 23 illustrates an embodiment of the present disclosure, wherein the cladding member 13 comprises a shield 13a, such as comprising a connection part 13a, which overlaps the exterior major surface 3su1 of the first projecting glass sheet portion 3p1 configured to face away from the building interior INT and towards the exterior EXT of the building. The shield 13a, such as the connection part 13a, may be supported by, such as attached 13c to, the exterior major surface 3su1, 3a2 of the first projecting glass sheet portion 3p1 configured to face away from the building interior INT. The connection part 13a may e.g. be attached to the surface 3su1 by means of one or more adhesives 13c. In additional or alternative embodiments, one or more mechanical means may attach the cladding 13 so that the shield 13a overlaps and protects a part of the projecting portion 3p1.
The shield 13a may extend e.g. at least 10 mm, such as at least 20 mm or at least 30 mm over the exterior surface 3su1 of the projecting portion 3p1 from the bottom edge 3a_be of the glass sheet EGS. The shield 13a may (not illustrated) or may not (illustrated in fig. 23) extend over the full extend of the first projecting distance DIS1. In fig. 23, the shield 13a extend over about half of the distance DIS1.
In some embodiments, the shield 13a may extend over at least 10%, such as at least 30% or at least 60% of the distance DIS1 from the bottom edge 3a_be.
It is generally understood that the connection part 13a may be unitary with the covering part 13b.
The cladding member 13, such as the shield 13a, may provide mechanical shielding of the first projecting glass sheet portion 3p1. Hence, when hails or the like strikes the projecting glass sheet portion 3p1, it may protect at least a part of the projecting glass sheet portion 3p1.
Fig. 23a illustrates an embodiment of the present disclosure where not the entire shield 13a is attached to the surface 3su1. The shield 13a extends in over the first projecting glass sheet member 3p1, and a sub part of the shield 13a is attached to the surface 3su1 by means of one or more adhesives 13c, in this case at a position distant to the bottom edge 3a_be of the exterior glass sheet EGS. A part of the shield 13a extending from the location of the adhesive 13c and to the covering part 13b extends over the surface 3su1 with a distance to the surface 3su1. This part of the shield is unattached to the surface 3su1 and an air gap is present between the shield 13a and the surface 3su1.
It is generally understood that the adhesive and/or a seal 13c (these may be the same or separate compositions) may provide water tightening preventing water entering in between the glass sheet EGS and the shield 13a. This water tightening may be provided along substantially the entire length of the shield in a direction parallel to the extent of the bottom edge 3a_be of the exterior glass sheet between glass sheet corners.
Fig. 24 illustrates schematically an embodiment of the present disclosure wherein a mechanical holding member 19a, 19b secures the exterior glass sheet EGS at the bottom BO, according to one or more embodiments of the present disclosure.
In fig. 24, the holding member 19a, 19b is part of an extension body support 19, (see also one or more of figs. 13-17). One or more mechanical holding members 19a, 19b may be provided. This/these 19a, 19b is/are configured to secure the exterior glass sheet (3a, 3d, EGS) at the bottom thereof.
The mechanical holding member 19a, 19b comprises a wall 19a placed opposite to the bottom edge 3a_be of the exterior glass sheet EGS - in the illustrated example glass sheet 3a.
The mechanical holding member may in some further embodiments may comprise a hook part 19b, such as a clamping part, extending from the wall 19a to a position opposite to the exterior major surface 3a2, 3su1 of the exterior glass sheet EGS, 3a at the window bottom BO. The hook part 19b and/or wall 19a is configured to secure the exterior glass sheet 3a, EGS at the frame 2, in this case to the movable frame 2a. The hook part 19 may e.g. provide securing of the glass unit to the frame. In some embodiments the hook part 19b may provide a safer solution in more extreme situations where wind or other forces provides that the vacuum insulated glass unit is pushed or pulled in a direction away from the exterior surface of the vacuum insulated glass unit which faces the exterior of the building, It may provide safety in case of fire and/or the like.
In some embodiments, the holding member 19a, 19b, e.g. comprising the hook part, may also be used for clamping the glass unit towards the frame 2a.
The mechanical holding member 19a, 19b may comprise or be made from metal such as comprising one or more of aluminium, iron or steel. In other embodiments, it may be made from a polymer. The wall 19a and(or holding member may in some embodiments have a thickness between 0.2 mm and 1.5 mm, such as between 0.2 mm and 1.2 mm, such as between 0.3 mm and 0.9 mm.
The bottom edge 3a_be, 3d_be (see e.g. also figs. 28 and 31, respectively) of the exterior glass sheet 3a, 3d, EGS may be placed at a first side of a holding wall 19a of the mechanical holding member, and the extension 18, such as comprising the extension body 20, may be placed at the opposite side of the holding wall 19a.
Fig. 24 illustrates a further embodiment of the present disclosure wherein the thickness of the extension body 20 is lower/smaller than the thickness of the exterior glass sheet. The extension body support 19 may hence extend from a position opposite to the bottom edge 3a_be of the exterior glass sheet EGS. This may be provided since the structural strength of the extension body support 19 may be of less importance and/or since the another material than the exterior glass sheet EGS may be used for the extension body 20.
In some embodiments, the extension body 20 may be or comprise a sheet, such as a glass sheet, having a thickness that is at least 10%, such as at least 25% or at least 40% lower than the thickness of the exterior glass sheet EGS and the first projecting glass sheet portion p1s thereof.
In other embodiments, the extension body 20 may have a thickness, such that is identical to the thickness of the exterior glass sheet EGS or larger than the thickness of the exterior glass sheet. This may be accommodated by means of the extension body support, e.g. in order to enable providing that the exterior extension surface 18a is substantially flush with the plane PL1 of the exterior glass sheet EGS surface 3su1.
Fig. 25 illustrates a further embodiment of the present disclosure, wherein the exterior glass sheet EGS comprises a fifth projecting glass sheet portion 3p5 at the top TO of the roof window 1. The fifth projecting glass sheet portion 3p5 projects beyond a top edge 3b_te of the adjacent glass sheet 3b, 3a. The fifth projecting glass sheet portion 3p5 may project beyond the top edge 3b_te of the adjacent glass sheet, in this case sheet 3b, with a third projecting distance DIS4. This projecting distance DIS4 may in some embodiments be less than 60 mm, such as less than 40 mm, such as less than 30 mm.
The third projecting distance DIS4 may be larger than 10 mm, such as larger than 20 mm, such as less than 30 mm.
The third projecting distance DIS4 may be between 10 mm and 60 mm, such as between 20 mm and 40 mm, such as between 25 mm and 35 mm.
As illustrated in fig. 25, the fifth projecting glass sheet portion 3p5 may in some embodiments project beyond the top edge of all other glass sheets of the glass unit 3.
Fig. 25 illustrates a further embodiment of the present disclosure, wherein a gasket 23 of the roof window comprises one or more parts 23a, 23b, such as one or more gasket lips, which support on the first glass sheet 3a. The one or more gasket parts 23a, 23bmay support directly or indirectly on the on the fourth projecting glass sheet portion 3p5. In fig. 25, the one or more gasket parts 23a, 23b abuts the exterior surface 3a2 of the exterior glass sheet EGS at the fourth projecting glass sheet portion 3p5.
It is generally understood that in some embodiments, the exterior glass sheet EGS may comprise one, more or all of the first projecting glass sheet portion 3p1, the third projecting glass sheet portion 3p3 (see e.g. fig. 18) and/or the fourth projecting glass sheet portion 3p5.
Hence, in some embodiments, the exterior glass sheet EGS may comprise the first projecting glass sheet portion 3p1 and the third projecting glass sheet portion 3p3. Here, the exterior glass sheet may substantially not extend beyond the top edge of the adjacent glass sheet at the top TO.
In other embodiments, the exterior glass sheet EGS may comprise the first projecting glass sheet portion 3p1 at bottom BO and the fifth projecting glass sheet portion 3p5 at top TO. Here the exterior glass sheet EGS may substantially not extend beyond side edges of the adjacent glass sheet at the roof window sides SI1, SI2.
In still further embodiments, the exterior glass sheet EGS may comprise both the first projecting glass sheet portion 3p1 (see e.g. figs 1-2B and/or other figs described above), the third projecting glass sheet portion 3p3 (see fig. 18) at sides SI1, SI2 and the fifth projecting glass sheet portion 3p5 at the top, see e.g. fig. 25. Here the exterior glass sheet projects beyond edges of one or more, such as all, glass sheets, or at least the adjacent glass sheet, of the glass unit 3.
In even further embodiments, the exterior glass sheet EGS may comprise the first projecting glass sheet portion 3p1 whereas the projecting portion(s) 3p3 at sides and at top 3p5 may be substantially omitted.
Fig. 26 illustrates schematically an embodiment of the present disclosure, wherein the evacuated gap 4 overlaps an edge seal 7a which encloses the further insulating gap 7 such as a gas filled/containing gap 7. In fig. 26, the evacuated gap 4 fully overlaps the width of the edge seal 7a enclosing the further insulating gap 7.
In other embodiments of the present disclosure, the evacuated gap 4 may only partly overlap the width of the edge seal 7a enclosing the further insulating gap 7, so that the edge seal 9 enclosing the evacuated gap 4 is arranged opposite to the edge seal 7a enclosing the further insulating gap.
In fig. 26, an enamel 12 is arranged at the surface of the exterior glass sheet EGS that faces towards the interior of the building INT and the evacuated gap 4.
Fig. 27 illustrates schematically an embodiment of the present disclosure, wherein the further insulating gap 7 overlaps the edge seal 9 enclosing the evacuated gap 4.
In fig. 27, the further insulating gap 7 fully overlaps the edge seal 9 whereas the edge seal 7a enclosing the further insulating gap 7 is arranged opposite to a protection sealing 11, such as a protection sealing 11 as previously described for protecting the edge seal 9.
The edge seal 9, such as a solder glass or solder metal edge seal, may act as a cold bridge, and providing that the evacuated gap 4 overlaps the edge seal 7a of the further insulating gap 7, and/or providing that the further insulating gap 7 overlaps the edge seal 9 (see e.g. figs. 26 or 27) may provide reduced heat transfer at the edge region(s) of the of the glass unit 3 thereby reducing negative effects of the cold bride at the seal 9.
Fig. 27 illustrates a further embodiment of the present disclosure, wherein an enamel layer 12 (such as an enamel layer 12 described above) covers a part of the evacuated gap 4 and the further insulating gap 7 at the roof window bottom BO.
Fig. 28 illustrates schematically a further embodiment of the present disclosure, wherein a gripping member 8a extends in between glass sheets of a glass unit comprising both the evacuated gap 4 and a further insulated gap 7 as e.g. previously described. This is provided at the roof window bottom BO.
In fig. 28, the gripping member 8a extends in between the third glass sheet 3d and the second glass sheet 3b. As the third glass sheet in fig. 28 is proximate the building interior INT the gripping member 8a extends to hold on the surface 3d1 of the third glass sheet 3d which face the further insulating gap 7. The part of the edge seal 7a enclosing the further insulating gap 7 is displaced away from the bottom edge 3d_be of the third glass sheet and the bottom edge of the second glass sheet 3b_be so as to provide a space for the gripping member 8a to extend into to grab the glass sheet 3d.
The lamination layer 6 and the glass sheet 3c may provide further structural strength and provide a stronger holding solution as the lamination layer 6 is attached to the glass sheet which the gripping member 8a engages with.
It is generally understood that in some embodiments of the present disclosure, an adhesive and/or a resilient part (not illustrated in fig. 28, see fig. 29) may be paced between the gripping member 8a and the glass sheet with which it 8a engages.
Fig. 28 illustrates a further embodiment of the present disclosure where the same member comprises both the gripping member 8a and a part of an extension 18 as described according to various embodiments above. The member comprising the gripping part 8a may additionally or alternatively comprise the cladding 13 (not illustrated in fig. 28) and moreover even the covering part 13b of the cladding 13, according to e.g. embodiments described above.
As illustrated, the member comprising the gripping part 8a may additionally comprise a mechanical holding member 19a, 19b, such as comprising a holding wall 19a, and/or a hook part 19b, which is configured to secure the exterior glass sheet 3a, 3d, EGS at the bottom thereof. Embodiments of such holding member is described above in relation to e.g. fig. 24.
Fig. 28 moreover illustrates an embodiment of the present disclosure wherein an extension body 20 (such as a body 20 as previously described) is replaceably arranged at an extension body support 19. For example, it 20 may be attached to the extension body support 19 by means of one or more fasteners 25a, 25b, such as mechanical fasteners.
In fig. 28, the fastener comprises one or more adjustable parts 25b, such as a screw,. This adjustable part 25b may be manipulated in order to e.g. enable removal a the extension body 20 in order to e.g. replace this 20 with a another extension body. This replacing of the extension body may e.g. be provided to

change visual impression, such as change colour, glossiness, material and/or the like provided by the extension body 20,
to replace a broken/damaged extension body,
to replace a malfunctioning, functional extension body
to install a functional extension body replacing a dummy extension body, and/or
to upgrade a functional extension body.

The adjustable part 25b may in some embodiments press the extension body 20 towards a wall 25b (in this embodiment the wall 25b is comprised in the member comprising the extension body support 19), and thereby secure it and/or maintain it in place.
In some embodiments, one or more of the one or more fasteners 25a, 25b, such as mechanical fasteners, may comprise one or more of one or more clips, one or more clamps, one or more pop rivets, one or more spring loaded holding members, one or more screws, one or more fixed walls 25a and/or the like.
In some embodiments, the extension body 20 may additionally or alternatively comprise a holding interface (such as comprising e.g. one or more recesses or protrusions) configured to engage with the one or more fasteners 25a, 25b.
The one or more fasteners 25a, 25b may in some embodiments be adjustable in order to enable receiving/holding extension bodies 20 of different thicknesses, design and/or the like, and still provide adjustment features enabling that the extension body 20 surface 18a may be adjusted to be substantially flush with the surface 3su1 after installation.
Fig. 28 illustrates a still further embodiment of the present disclosure, wherein the extension 18 comprises an enamel layer 12. This layer 12 may be attached to or integrated in the extension body 20 or may be attached to the extension body support 19. In some embodiments, the extension body 20 may comprise the enamel layer 12, and the enamel layer may be visible through the surface 18a of the extension body 20 from the exterior EXT. In some embodiments, the enamel 12 of the extension may be similar to an enamel layer 12 covering a part of the first projecting glass sheet portion 3p1 as e.g. previously described.
Figs. 29-31 illustrates schematically various embodiments of the present disclosure, wherein the further insulating gap 7, such as a gas filled gap, is the gap of the vacuum insulated glass unit 3 that is configured to be placed proximate the building exterior EXT. The third glass sheet 3d is the exterior glass sheet EGS and comprises the first projecting glass sheet portion 3p1. The evacuated gap 4 is in figs. 29-31 placed between the further insulating gap 7 and a lamination layer 6, 3c, between glass sheets 3a, 3b. The evacuated gap 4 is in figs. 29-31 the insulating gap of the two insulating gaps 4, 7 of the glass unit 3 that is placed proximate the building interior when the movable frame 2a is in a closed position.
In fig. 29, a gripping member 8a as e.g. described above extends in between the exterior glass sheet EGS, 3d, and the first glass sheet 3a, which is placed adjacent to the exterior glass sheet EGS. The further insulating gap 7 is placed between the exterior glass sheet and the first glass sheet. Hence, the first and second glass sheets 3a, 3b enclosing the evacuated gap 4, (and optionally also the lamination layer 6, 3c), may be placed between the gripping member 8a and the bottom profile 2a_bo of the movable frame 2a.
As illustrated in figs. 28 and 29, the gripping member 8a may be a part, such as an integrated part, of a member 8 that is attached to the movable frame 2a by means of e.g. one or more mechanical fasteners 34, for example as described above in relation to e.g. fig. 13 and/or fig. 17. In some embodiments, the member 8 and/or the profile 2a_bo may also comprise a guide 36 (not illustrated in fig. 29) as e.g. described above, such as in relation to e.g. fig. 13 and/or fig. 17. In some embodiments the guide may be omitted.
Figs. 28-29 moreover illustrates embodiments of the present disclosure wherein the edge seal 9 which encloses the evacuated gap 4 overlaps an edge seal 7a which encloses the further insulating gap 7. In fig. 28 it 9 partly overlaps the edge seal 7a whereas in fig. 29, it 9 fully overlaps the edge seal 7a.
Fig. 30 illustrates schematically an embodiment of the present disclosure, where the roof window 1 comprises a glass unit 3 comprising the evacuated gap 4 and the further insulating gap 7.
In fig. 30, the further gap 7 overlaps the edge seal 9 enclosing the evacuated gap 4. The further gap 7 moreover extends beyond the bottom edge 3b_be of the second glass sheet 3b which comprises the surface 3b1 that faces the evacuated gap 4 and provides a part of the enclosing of the evacuated gap 4. The second glass sheet 3b is placed closer to the building interior INT than the first glass sheet 3a.
The first glass sheet 3a is placed between the exterior glass sheet EGS and the second glass sheet 3b. The second glass sheet 2a is placed between the lamination layer 6, 3a and the evacuated gap 4. The evacuated gap 4 is placed between the first glass sheet 3a and the second glass sheet 3b.
Exterior glass sheet EGS, which in fig. 30 is the third class sheet 3d, comprises the first projecting glass sheet portion 3p1 that projects beyond the bottom edge 3b_be of the second glass sheet 3b.
The first glass sheet 3a also comprises a projecting glass sheet portion that projects beyond the bottom edge 3b_be of the second glass sheet 3b.
As illustrated, in some embodiments of the present disclosure, the first glass sheet 3a may project beyond the bottom edge 3b_be of the second glass sheet 3b with a distance substantially corresponding to the distance DIS1 with which the exterior glass sheet EGS projects beyond the bottom edge 2b_bo of the second glass sheet.
In fig. 30, both the first glass sheet 3a and the exterior glass sheet EGS (third glass sheet) 3d, extends beyond the bottom edge 3b_be of the second glass sheet 3b. In some embodiments (not illustrated in fig. 30, see e.g. fig. 4) the bottom edge of the second glass sheet 3b may project beyond the lamination layer 6, 3c.
In some embodiments, the further insulated (e.g. gas filled) gap 7, may project at least 10 mm, such as at least 20 mm, such as at least 30 mm or at least 40 mm beyond the bottom edge 3b_be of the second glass sheet.
In some embodiments, the further insulated (e.g. gas filled) gap 7, may project between 10 mm and 200 mm, such as between 20 and 100 mm, such as between 25 mm and 50 mm beyond the bottom edge 3b_be of the second glass sheet.
In some embodiments, the further insulated (e.g. gas filled) gap 7 may project no more than 30 mm, such as no more than 25 mm beyond the bottom edge 3b_be of the second glass sheet.
The evacuated gap 4 may as illustrated, in some embodiments overlap the movable frame bottom profile. The evacuated gap 4 may however in some embodiments not overlap the full width (see W1 in fig. 1) of the bottom profile 2a_bo. In other embodiments, the evacuated gap 4 may overlap the full width (see W1 in fig. 1) of the bottom profile 2a_bo, see
In fig. 30, the further gap 7 overlaps the full width (see e.g. W1 of fig. 1) of the bottom frame profile 2a_bo of the movable frame 2a, and projects beyond the surface side of the profile 2a_bo that faces away from the first frame opening FO1.
As can be seen in fig. 30, in some embodiments, the further insulating gap 7 may extend to a position opposite the fixation frame bottom profile 2b_bo. In other embodiments, the gap 7 may not extend to a position opposite the fixation frame bottom profile 2b_bo.
In fig. 30, the first projecting glass sheet portion 3p1 of the exterior glass sheet EGS, which provides a part of the enclosing of the further insulating gap 7, does not project beyond the bottom edge 3a_be of the first glass sheet 3a. The first glass sheet provides both a part of the enclosing of both the evacuated gap 4 and the further insulating gap 7, and is placed between the further insulating gap 7 and the evacuated gap 4. In other embodiments, The first projecting glass sheet portion 3p1 may however project beyond the bottom edge 3a_be of the first glass sheet 3a, see fig. 39.
Fig. 30 moreover illustrates an embodiment of the present disclosure, wherein an enamel layer 12 is arranged at the major surface of the exterior glass sheet EGS which faces the further insulating gap 7.
Fig. 30 moreover illustrates a further embodiment of the present disclosure, wherein a cladding member 13 comprising a covering part 13b is provided. The cladding member 13 may in embodiments be provided as e.g. described above, e.g. in relation to varios embodiments of the present disclosure. The cladding member 13 comprises a connection part 13a, which overlaps the exterior major surface 3su1 of the exterior glass sheet EGS that is configured to face away from the building interior INT and towards the exterior EXT of the building. The connection part 13a may be attached to the glass unit surface 3su1 by means of one or more adhesives 13c, see also description relating to figs. 23-23a.
Fig. 31 illustrates schematically an embodiment of a roof window, wherein the further insulating gap 7 is placed proximate the building exterior EXT. The third glass sheet 3d is the exterior glass sheet EGS and comprises the first projecting glass sheet portion 3p1. The evacuated gap 4 is placed between the further insulating gap 7 and a lamination layer 6, 3c.
In fig. 31, the first projecting glass sheet portion 3p1 extends beyond both the bottom edge 3a_be of the first glass sheet 3a and the bottom edge 3b_be of the second glass sheet 3b. The first glass sheet 3a is placed between the exterior glass sheet EGS and the second glass sheet 3b. The second glass sheet 2a is placed between the lamination layer 6, 3a and the evacuated gap 4. The evacuated gap 4 is placed between the first glass sheet 3a and the second glass sheet 3b.
Fig. 31 illustrates a further embodiment of the present disclosure, wherein an extension 18 provided. In fig. 31, the extension 18 comprises an extension body 20 and an extension body support 19 e.g. as described according to various embodiments.
The extension 18 may generally comprise one or more of the features as described above, for example as described in relation to one or more of figs. 13-17, 24 and/or 28. Hence, in some embodiments, the extension body 20 may be omitted. See e.g. fig. 15, 16 or 17. The extension 18 is arranged in continuation of the exterior glass sheet EGS, 3d. The extension body 20 may e.g. be replaceable as for example described above in relation to fig. 28.
Fig. 32 illustrates schematically an embodiment of the present disclosure wherein the exterior glass sheet EGS is displaced towards the bottom BO of the roof window to provide the first projecting glass sheet portion 3p1. At the roof window top TO, the second glass sheet 3b projects beyond the top edge 3a_te of the exterior glass sheet EGS, e.g. as described in relation to fig. 19. It is understood that in other embodiments, the exterior glass sheet EGS may be longer than the second glass sheet 3b and have a top edge 3a_te that either is substantially flush with the top edge 3b_te of the second glass sheet 3b (indicated in fig. 1) or extends beyond the top edge 3b_te of the second glass sheet, e.g. as described in relation to fig. 25.
Fig. 33 illustrates schematically a roof window according to embodiments of the present disclosure, installed in a building roof structure 50, seen from the outside. See also description above relating to e.g. fig. 3. The roof window comprises an extension 18 at the roof window 1 bottom BO as e.g. described in relation to various embodiments described above. In this embodiment, the extension comprises an extension body 20, but in other embodiments, an extension member 18b as e.g. illustrated in figs 15, 16 or 17 may be provided instead. The hook part 19b and holding wall 19a are visible in fig. 33. See e.g. description relating to one or more of figs. 24, 28 or 31. Also fasteners 25a for holing the extension body 20 are illustrated. The extension body support 19 described above may comprise the hook part 19b and holding wall 19a and/or the fastener 20a. In fig. 33, two hook parts 19b and fasteners 25a are illustrated as being discretely arranged at the holding wall along the width direction WD of the roof window 1. More or less than two hook parts 19b and/or fasteners 25a may be provided in other embodiments. In further embodiments (not illustrated) a single elongated hook part 19b and/or fastener 25a may be provided and extend along at least 80%, at least 90% or substantially along the full width of the glass unit 3, in the width direction.
Dash-dotted line referred to as 2a indicates the surface of the bottom profile 2a_bo of the movable frame that faces and abuts the first frame opening, and dashed line referred to with 3b_be indicates the bottom edge of the second glass sheet 3b beyond which the first projecting glass sheet portion 3p1 projects.
Fig. 34 illustrates schematically an embodiment of the present disclosure wherein the first projecting glass sheet portion 3p1 does not extend beyond the surface 2a_bos2 of the bottom profile 2a_bo of the movable frame 2a that faces the fixation frame 2b. Instead, an extension 18 as e.g. preciously described, in relation to one or more of figs 13-17, 24, 28 and/or 31 provides an overlap of the fixation frame 2b.
Fig. 34 moreover illustrates an embodiment of the present disclosure wherein the extension body support 19 comprises a recessed portion into which the extension body 20 extends. Also at the bottom of the extension body 20, a wall of the extension body support 19 extends to a position opposite a bottom edge of the body 20, which bottom edge is arranged distant to the bottom edge of the exterior glass sheet EGS. The covering part 13b of the cladding 13 extends from a position opposite or proximate the bottom part of the extension body 20.
Fig. 35 illustrates a vacuum insulated glass unit 3 according to embodiments of the present disclosure, seen towards the exterior surface 3su1. The roof window 1 frame is omitted to improve understanding. The first projecting glass sheet portion 3p1 is indicated in fig. 35. The enamel 12 overlaps the edge seal 9 enclosing the evacuated gap 4 (see e.g. fig. 1). However, the enamel 12 may as illustrated be terminated before reaching a support structure 5 so that no support structure supports on the enamel 12. In other embodiments, support structures 5 may support on the enamel 12. The enamel 12 is indicated by dash-dotted hatch lines in fig. 35. The enamel 12 extends from the bottom edge 3a_be of the exterior glass sheet EGS and covers substantially the entire surface of the projecting glass sheet portion 3p1 from the bottom edge 3a_be.
It is generally understood that in various embodiments of the present disclosure, as illustrated in several of the figures described above, see e.g. figs. 1-2B and 4-21, the glass unit / vacuum insulated glass unit 3 may comprise just one insulating gap 4 (the evacuated gap) arranged between exterior major surfaces 3su1, 3su2 of the glass unit 3. Such a singe gap 4 vacuum insulated glass unit 3 may have a U_g (U_glazing ) value of below 0.8 W/(m ² K), such as below 0.6 W j(m2K), such as below 0.5 W/(m ² K). The U_g (U_glazing ) value of such a singe gap 4 unit 3 may be between 0.35-0.7 W/(m ² K), such as between 0.4-0.6 W/(m ² K).
In other embodiments of the present disclosure, as illustrated in several of the figures described above, see e.g. figs. 22-32 1-2B and 4-21, the glass unit / vacuum insulated glass unit 3 may comprise the evacuated gap 4 and a further insulating gap such as a gas filled gap 7, such as a gap 7 containing argon. Such a vacuum insulated glass unit 3 comprising the gaps 7, 4 may have a U_g (U_glazing ) value of below 0.5 W/(m ² K), such as below 0.4 W/(m ² K), such as below 0.3 W/(m ² K). The U_g (U_glazing ) value of such a unit 3 may be between 0.2-0.5 W/(m ² K), such as between 0.25-0.4 W/(m ² K).
The U_g value may be determined at the centre portion CEGU of the glass unit 3, The centre portion CEGU of the glass unit 3 may be the location of the evacuated gap arranged where two diagonally extending lines 49a, 49b, which extends between diagonally arranged corner portions of the edge seal 9, intersect.
Fig. 36 illustrates an embodiment of the present disclosure, wherein the step support 15 comprises a mechanical holding member 19a, 19b. The mechanical holding member comprises a holding wall 19a, 19b, which is configured to secure the exterior glass sheet 3a, EGS at the bottom thereof. The mechanical holding member comprises a wall (19a) placed opposite to, such as next to, the bottom edge 3a_be exterior glass sheet 3a, EGS. The mechanical holding member may moreover comprise a hook part 19b extending to a position opposite to the exterior major surface 3a2, 3su1of the exterior glass sheet EGS, 3a. See e.g. also refs. 19a-19b described above in relation to various embodiments of the present disclosure. In fig. 36, the step support 15 comprises a member that is attached to the movable frame 2a bottom profile, e.g. by means of one or more mechanical fasteners 34 as e.g. described above.
In fig. 36, the step support 15 also comprises the cladding 13 comprising the covering part 13b. The step support and the cladding member 13 are in fig. 36 integrated in the same member.
It is generally understood that in one or more embodiments of the present disclosure, the glass unit 3, including the first projecting glass sheet portion 3p1 as described above and/or below according to various embodiments of the present disclosure, may extend over the entire width W1 (see fig. 1) of the bottom profile 2a_bo, and over at least 20%, such as over at least 50%, such as over at least 80% or over at least 90% of the width W2 (see fig. 1) of the bottom profile 2b_bo of the fixation frame 2b.
Fig. 37 illustrates schematically and in perspective a roof window 1 according to embodiments of the present disclosure. Here, the roof window is of the centre hung type, The movable frame 2a is configured to move, such as pivot, relative to the fixation frame 2b by means of one or more hinges 60, and the vacuum insulated glass unit 3 is attached to the movable frame 2a and is configured to move together with the movable frame 2a.
Fig. 37 moreover illustrates a fixation frame according to embodiments of the present disclosure, comprising a longitudinal, structural top profile 2b_to, a longitudinal, structural bottom profile 2b_bo, and two longitudinal, structural side profiles 2b_si. The longitudinal directions of the top and bottom profiles are parallel. The longitudinal directions of the side profiles are parallel. The longitudinal direction of the side profiles of the fixation frame 2b are substantially perpendicular to the longitudinal directions of the top and bottom profiles of the fixation frame.
Fig. 37 moreover illustrates a movable frame 2a according to embodiments of the present disclosure, comprising a longitudinal, structural top profile 2a_to, a longitudinal, structural bottom profile 2a_bo, and two longitudinal, structural side profiles 2a_si. The longitudinal directions of the top and bottom profiles are parallel. The longitudinal directions of the side profiles are parallel. The longitudinal direction of the side profiles of the movable frame 2a are substantially perpendicular to the longitudinal directions of the top and bottom profiles of the movable frame 2a.. Hinges 60 interconnects the side profiles 2a_bo, 2b_bo and provides a rotation axis RAX that may be substantially horizontal. The rotation axis RAX is arranged between the top and bottom profiles and is substantially parallel to the longitudinal direction of these profiles. The centre hung roof window in fig. 37 may in some embodiments be top hung. In that case, the hinges 60 may comprise, or be connected, to arms extending to a top hinge (not illustrated) arranged at the roof window top TO. In other embodiments, the centre hung roof window in fig. 37 may not be top hung.
Fig. 38 illustrates schematically a bottom BO part of a roof window according to embodiments of the present disclosure. Here, a step support 15 as e.g. described above, is provided. The step support 15 comprises an attachment part 35 as e.g. described previously. This attachment part 35, such as a plate and/or a bracket/mounting, is attached to the frame profile 2a_bo by means of the one or more mechanical fasteners 34. This attachment is provided at the surface 2a_bos2 side of the bottom frame profile 2a_bo of the movable frame 2a that faces the fixation frame bottom profile 2b_bo and faces away from the first frame opening FO1.
Fig. 38 moreover illustrates an embodiment of the present disclosure, wherein the step support in fig. 38 is a plate member 15 that is attached by means of adhesive 33a, 33b to the first projecting glass sheet portion 3p1. This may in some embodiments be provide by means of a first adhesive type 33a and a second adhesive type 33b.
In fig. 38, two adhesives of the second adhesive type 33b is placed between two adhesives of the first adhesive type 34a. It is understood that in other embodiments, more or less than two of the first adhesive type 33a may be used. It is also understood that in some embodiments, more or less than two of the second adhesive type 33b may be used.
In some embodiments, the first adhesive type 33a may be or comprise a glue, and the second adhesive type 33b may be or comprise an adhesive tape. In some embodiments, the second adhesive type 33b may be or comprise a glue, and the first adhesive type 33b may be or comprise a glue. In some embodiments, both adhesives 33a, 33b may comprise a tape or a glue.
The adhesive(s) 33a, 33b may or may not provide support elevations 17 as described above.
In some embodiments, combination of a tape and a glue may be provided as the first and second adhesive typers 33a, 33b. This may e.g. provide manufacturing advantages. The glue may be the primary adhesive, and may be used even though it has a longer curing time. While it cures, the tape may provide initial sufficient (and in some cases secondary) attachment. In fig. 38 and several of the figures described above, no mechanical holding means extend to hold on the exterior glass sheet EGS and/or another glass sheet at the bottom. In other embodiments of the present disclosure, as e.g. illustrated in one or more of figs. 5, 24,28, 29 31, 33-34, 36, mechanical holding 8, 8a, 19a, 19b may additionally or alternatively be provided at the bottom part of the glass unit 3 so as to mechanically fixate the glass unit 3a to the movable frame 2a. Such mechanical holding means may also be integrated in the member 13a, 15.
Fig. 38 illustrates a still further embodiment wherein the covering part 13b of the cladding extends through the second plane PL2 that comprises the exterior of the roofing material 51.
In fig. 38 and several of the figures described above, the step support 15 configured to support the first projecting glass sheet portion 3p1 comprises a plate/sheet, such as a polymer sheet/plate and/or a metal sheet/plate, e.g. an aluminium sheet, at steel sheet or the like. The plate/sheet of the step support 15 may in some embodiments have a thickness between 0.2 mm and 1.5 mm, such as between 0.2 mm and 1.2 mm, such as between 0.3 mm and 0.9 mm. This may provide sufficient support of the portion 3p1.
The member, such as a profile member, comprising the step support 15 may e.g. comprise one or more bends in order to provide a desired cross sectional shape of the member. The one or more bends may e.g. shape the plate/sheet provide one or more of

one or more parts/areas for step 3p1 support,
provide a part 35 for attachment at a frame profile,
provide cladding 13
provide one or more mechanical holding members 19a, 19b (see e.g. fig. 24)
provide part 19, 18b of an extension 18

In some embodiments, the member comprising one or more of the above may e.g. be shaped by roller shaping, by extrusion and/or pultrusion and/or the like.
Fig. 39 illustrates schematically an embodiment of the present disclosure, wherein the glass unit comprises an evacuated gap 4 and a further insulating gap 7, such as a gas filled gap, as e.g. described above. The further gap 7 is a gas filled insulating gap, and is placed closer to the exterior EXT than the evacuated gap 4, when the movable frame is in a closed position. The exterior glass sheet EGS is hence provided by the third glass sheet 3d that comprises the major surface 3d1 facing the further gap, and comprises the surface that provides the major exterior glass unit 3 surface 3su1 that faces the exterior EXT. In fig. 39, the distance DIS1 with which the exterior glass sheet EGS projects beyond the bottom edge 3b_be of the second glass sheet 3b is larger than the distance with which the first glass sheet 3a projects beyond the bottom edge 3b_be of the second glass sheet 3b. Both the first projecting glass sheet portion 3p1 of the third (exterior EGS) glass sheets 3d and the first glass sheet 3a extends beyond the bottom edge 3b_be of the second glass sheet 3b. The first projecting glass sheet portion 3p1 moreover projects beyond the edge seal 7a enclosing the further insulating gap.
In other embodiments, see e.g. fig. 29, the first glass sheet 3a providing a part of the enclosing of the evacuated gap 4 may not project beyond the bottom edge 3b_be of the second glass sheet 3b that provides a part of the enclosing of the evacuated gap 4 and is placed at the other side of the evacuated gap 4.
The further, insulating gap 7 may fully (as illustrated), or partly (not illustrated in fig. 38), overlap the edge seal 9a enclosing the evacuated gap 4.
As illustrated in various figures described above and/or below, see e.g. the various embodiments illustrated in figs. 1-2A, 4-17, 22, 23, the cladding member 13 may comprise a connection part 13a which extends in between the first projecting glass sheet portion 3p1 and a bottom frame profile 2b_bo of the fixation frame 2b. The connection part 13a may here comprise a part, such as a bracket or plate that is fixated to the glass unit. For example, it 13a may be attached to a surface of the first projecting glass sheet portion 3p1 that faces the building interior and/or a profile 2b_bo of the fixation frame, or may be attached to another glass sheet of the glass unit. For example as illustrated in fig. 15 or 16. Additionally or alternatively, the connection part 13a may comprise a part, such as a bracket or plate, that is fixated directly or indirectly to the movable frame 2a (see e.g. fig. 12, 13 or 17 or 34), such as to the bottom frame profile 2a_bo, by means of one or more fasteners, such as one or more mechanical fasteners 34. An installation guide 36 may or may not be provided.
Various embodiments of the cladding member 13, step support (s) 15, 15a, 15 and projection 18 are described above according to various embodiments of the present disclosure.
Generally it is to be understood that the same member, such as an elongated profile, may comprise one, more than one, or all of:

the extension 18, such as comprising an extension body support 19 supporting an extension body 20, or an extension member 18b, as disclosed according to various embodiments of the present disclosure described above and/or illustrated in the figures,
the/a cladding member 13 comprising the covering part 13b as disclosed according to various embodiments of the present disclosure described above and/or illustrated in the figures and/or
one or more or more step support(s) 15, 15a, 15b as disclosed according to various embodiments of the present disclosure described above above and/or illustrated in the figures.

In e.g. figs. 13, 24, 34, the same member comprises both step support 15, extension 18 and cladding. In fig. 17, the same member comprises extension 18 and cladding 13, but not a step support 15.
If the extension 18 is not present, as illustrated in several of the figures described above (see e.g. figs. 1-2B, 4-12, 20-23, 26-27, 29-30, 32, 36, 38, 39), the same member may or may not comprise both the/a cladding member 13 comprising the covering part 13b and one or more or more step support(s) 15, 15a, 15b. The cladding member 13 and the step support 15 may or may not be unitary parts of the same member. For example, the cladding 13 may be attached to the glass unit 3 at an exterior major surface 3su1 or an interior major surface of a glass sheet 3a, 3d, 3b, 3c, see e.g. fig. 5 or 6 or 21-23a, whereas the support(s) 15, 15a, 15b may be attached to a profile 2a_bo of the movable frame, e.g. by means of an attachment part 35 and an adhesive and/or mechanical fastener(s) 34.
If the extension 18 is present, the same member (providing extension body support 19 or extension member 18b) may comprise none of, or one or both of, the cladding member 13, 13b and one or more or more step support(s) 15, 15a, 15b. If the same member comprises the extension 18 and one or both of the covering part 13b of the cladding and the step support(s), one or both of these 13,, 15, 15a, 15b may or may not be unitary parts of the member.
It is however understood that in some embodiments, one or both of the cladding member 13 and/or step support 15 may be separate to the extension body support 19.
It is understood that in several of the figures above, the frame 2 may comprise a movable frame 2a and a fixation frame 2b. However, in further embodiments, , the movable frame 2a may be omitted, and hence, the frame may alone comprise a fixation frame being attached to a building roof structure. In this/these embodiments, the glass unit 3 may be unmovable when installed in the building roof structure.
In some embodiments of the present disclosure, the total surface area of a major surface 3a1, 3a2, 3d1, 3d2 of the exterior glass sheet EGS, 3a, 3d may be larger than the total surface area 3b1, 3b2, 3a1, 3a2, 3d1, 3d2 of one or more other glass sheets 3a, 3b, 3d, such as the adjacent glass sheet 3a, 3b, 3d. This may e.g. be provided due to one or more of the projecting glass sheet portions 3p1, 3p3, 3p5 of the exterior glass sheets as e.g. described above.
The projection distances DIS1, DIS3, DIS4 described above according to various embodiments of the present disclosure may represent a projection length of the respective glass sheet relative to an edge of another glass sheet of the glass unit 3.

DIS1 may represent a projection length with which an exterior glass sheet portion projects beyond a bottom edge of another glass sheet at the roof window bottom BO
DIS3 may represent a projection length of exterior glass sheet portion 3p3 at a roof window side SI1, SI2
DIS4 may represent a projection length of exterior glass sheet portion 3p5 at roof window top TO

The projection distances/lengths described above may be measured/determined in a direction that is parallel to a plane PL1 of a major glass sheet surface, and in a direction that is perpendicular to the longitudinal direction of the edge beyond which the respective projecting glass sheet portion extends. Hence, the distance/length of the projecting glass sheet portion may be determined as e.g. illustrated in one or more figures described above, see e.g. examples in figs. 1, 13-18, 23-25, 28-31, 34, 38-39.
The extension distance DIS2 may in a similar way represent an extension 18 length, see e.g. figs 13-17.
The projection distances DIS1, DIS3, DIS4 may extend to and terminate at the respective glass sheet edge of the projecting glass sheet portion. For example, in fig. 1, the projection distance/length DIS1 terminates at the glass sheet bottom 3a edge 3a_be. In fig. 14, the extension distance/length DIS2 terminates at the edge of the extension body that is distant to the bottom edge of the exterior glass sheet EGS. In fig. 18, the projection distance/length DIS3 terminates at the side edge 3a_se of the exterior glass sheet EGS. In fig. 25, the projection distance/length DIS4 terminates at the top edge 3a_te of the exterior glass sheet EGS.

Items

Various embodiments of the present disclosure are moreover described in the items below.

1. A roof window (1) for installation in a roof structure of a building, wherein the roof window (1) comprises
- a frame (2, 2a, 2b), and
- a vacuum insulated glass unit (3) supported by the frame (2),wherein the vacuum insulated glass unit (3) comprises a first glass sheet (3a) and a second, glass sheet (3b), wherein an insulating, evacuated gap (4) is placed between the first glass sheet (3a) and the second glass sheet (3b), wherein a plurality of support structures (5) are distributed in the evacuated gap (4) so as to maintain a distance between a first major surface (3a1) of the first glass sheet (3a) facing towards the evacuated gap (4) and a first major surface (3b1) of the second glass sheet (3b) facing towards the evacuated gap (4), wherein an edge seal (9) encloses the evacuated gap (4),
- wherein the first glass sheet (3a) is configured to be placed closer to the exterior (EXT) of the building than the second glass sheet (3b) when the roof window (1) is installed in a building roof structure (50),
- wherein the vacuum insulated glass unit (3) comprises an exterior glass sheet (EGS, 3a, 3d) comprising an exterior major surface (3a2, 3d2) configured to face towards the exterior (EXT) of the building,
- wherein the exterior glass sheet (3a, 3d, EGS) comprises a first projecting glass sheet portion (3p1) which projects beyond a bottom edge (3b_be) of the second glass sheet (3b) with a first projecting distance (DIS1),
- wherein the first projecting glass sheet portion (3p1) overlaps one or more structural bottom profiles (2a_bo, 2b_bo) of the frame (2, 2a, 2b),
- wherein the vacuum insulated glass unit (3) comprises a lamination layer (6, 3c).
2. A roof window (1) according to item 1, wherein the frame comprises a movable frame (2a) and a fixation frame (2b), wherein the movable frame (2a) is configured to move, such as pivot, relative to the fixation frame (2b) by means of one or more hinges (60), wherein the vacuum insulated glass unit (3) is attached to the movable frame (2a) and is configured to move together with the movable frame (2a),
such as wherein the roof window (1) is a roof window (1) of the centre hung type.
3. A roof window (1) according to item 2, wherein the movable frame (2a) comprises a first structural bottom profile (2a_bo) and wherein the fixation frame (2b) comprises a further structural bottom profile (2b_bo),
- wherein the exterior glass sheet (EGS, 3a, 3d), such as comprising at least a part of the projecting glass sheet portion (3p1), partly or fully overlaps the full width (W1) of the first structural bottom profile (2a_bo),
- such as wherein the first projecting glass sheet portion (3p1) partly or fully overlaps the width (W2) of the further structural bottom profile (2b_bo).
4. A roof window (1) according to any of the preceding items, wherein the lamination layer (6, 3) comprises a lamination interlayer (6) and a lamination glass sheet (3c), such as wherein the lamination interlayer comprises or consist of one or more of the following:
- ethylene vinyl acetate (EVA),
- polyisobutylene (PIB),
- polyacetals such as polyvinyl butyral (PVB),
- transparent polyurethane (PU),
- thermoplastic polyurethane (TPU),
- polyvinyl chloride (PVC),
- polyesters,
- cyclo olefin polymers (COP),
- ionomers and/or an ultraviolet activated adhesives.
5. A roof window (1) according to any of the preceding items, wherein the lamination layer (6, 3) comprises a lamination interlayer (6), wherein the lamination interlayer has a thickness above 0.5 mm, such as above 0.7 mm, such as above 1 mm or above 1.4 mm.
6. A roof window (1) according to any of the preceding items, wherein said first glass sheet (3a) is configured to be said exterior glass sheet (EGS),
such as wherein said first major surface (3a1) of the first glass sheet (3a) is configured to face towards the interior (INT) of the building when the roof window is installed in a building roof structure (50).
7. A roof window (1) according to any of the preceding items, wherein the first projecting glass sheet portion (3p1) projects with the first projecting distance (DIS1) beyond a bottom edge (3b_be, 3d_be) of a glass sheet (3a, 3b) of the vacuum insulated glass unit (3) which is adjacent to the exterior glass sheet (EGS, 3a, 3d) of the vacuum insulated glass unit.
8. A roof window (1) according to any of the preceding items, wherein one or more glass sheets (3a, 3b) arranged between the exterior glass sheet (3a, 3d EGS) and the lamination layer (3c, 6) comprises a second projecting glass sheet portion (3p2), wherein the second projecting glass sheet portion (3p2) projects beyond an edge, such as a bottom edge (3c_be, 6e), of the lamination layer (3c, 6).
9. A roof window (1) according to item 4 and 8, wherein the second projecting glass sheet portion (3p2) projects beyond a bottom edge (6e) of the lamination interlayer, (6) at the bottom (BO) of the roof window (1),
- and/or wherein the second projecting glass sheet portion (3p2) projects beyond the lamination glass sheet (3c), such as projects beyond a bottom edge (3c_be) of the lamination glass sheet (3c) at the bottom (BO) of the roof window (1),
- such as wherein the lamination layer (6a) and/or the lamination glass sheet (3c) overlap a bottom frame profile (2a) of the frame (2).
10. A roof window (1) according to any of the preceding items, wherein the vacuum insulated glass unit (3) comprises a protection sealing (11), wherein the protection sealing covers the edge seal (9), such as a solder edge seal, such as a glass solder edge seal or metal solder edge seal, enclosing the evacuated gap (4),
- wherein the first glass sheet (3a, 3p1) overlaps the protection sealing (11),
- such as wherein the protection sealing (11) is a resilient, water tightening sealing.
11. A roof window (1) according to any of the preceding items, wherein the vacuum insulated glass unit (3) comprises an enamel layer (12), such as an enamel layer (12) which is substantially opaque to at least visible light,
- wherein the enamel layer (12) covers, such as is applied to, a surface (3a1, 3p1s) of the first projecting glass sheet (3a, 3d, EGS) portion (3p1),
- such as wherein said covered surface (3a1, 3p1s) is part of the major surface (3a1, 3d1) of the exterior glass sheet (3a, 3d, EGS) configured to face towards the interior (INT) of the building when the roof window is installed in a building roof structure (50).
12. A roof window (1) according to claim 11, wherein the enamel layer (12) extends into the evacuated gap (4) and/or wherein the enamel layer (12) extends in between the first glass sheet (3a) and the edge seal (9).
13. A roof window (1) according to item 11 or 12, wherein the enamel layer (12) covers a major surface (3p1s) of the first projecting glass sheet portion (3p1) so as to hide one or more parts (13, 14, 15, 2a, 2b,) of the roof widow.
14. A roof window (1) according to item 11, 12 or 13, wherein the enamel layer (12) covers substantially an entire major surface (3p1s) of the first projecting glass sheet portion (3p1).
15. A roof window (1) according to any of the preceding items, wherein one or more low-e coatings (16a) is/are arranged at said adjacent glass sheet (3a, 3b) at a major surface (3b1, 3a2) of the adjacent glass sheet (3b) facing towards the evacuated insulating gap (4).
16. A roof window (1) according to any of the preceding items, wherein the roof window comprises one or more step supports (15, 15a, 15b) configured to support the first projecting glass sheet portion (3p1).
17. A roof window (1) according to items 2 and 16, wherein one or more of the one or more step supports (15, 15a, 15b) is/are attached to a bottom profile (2a_bo) of the movable frame (2a).
18. A roof window (1) according to item 2 and any of items 16-17, wherein one or more of the one or more step supports (15, 15a, 15b) comprises a body part which extends to, and/or is placed opposite to, a position opposite a surface (2b_boa) of a bottom profile (2b_bo) of the fixation frame (2b) facing the first projecting glass sheet portion (3p1).
19. A roof window (1) according to any of items 16-18, wherein one or more of the one or more supports (15, 15a, 15b) is placed between the first projecting glass sheet portion (3p1) and a surface (2b_boa, 2a_boa) of one or more bottom profiles (2a_bo, 2b_bo) facing the first projecting glass sheet portion (3p1).
20. A roof window (1) according to any of items 16-19, wherein the one or more step supports (15a, 15b, 15) support first projecting glass sheet portion (3p1) at one or more locations arranged with a distance of at least 10%, such as at least 40%, such as at least 60% of the first projecting distance (DIS1) from the bottom edge (3b_be) of the second glass sheet (3b).
21. A roof window (1) according to any of items 16-20, wherein one or more of the one or more step supports (15, 15a, 15b) is attached to the first projecting glass sheet portion (3p1), such as by means of one or more an adhesives (33a, 33b).
22. A roof window (1) according to item 21, wherein said adhesive comprises an adhesive tape and/or a glue.
23. A roof window (1) according to any of items 16-22, wherein one or more of the one or more step supports (15, 15a, 15b) comprises one or more resilient support elevations (17, 33a, 33b), such as wherein said one or more resilient support elevations (17, 33a, 33b) comprises discretely arranged support elevations and/or one or more adhesives.
24. A roof window (1) according to any of the preceding items, wherein the first projecting distance (DIS1) is at least 6 mm, such as at least 25 mm, such as at least 45 mm.
25. A roof window (1) according to any of the preceding items, wherein the first projecting distance (DIS1) is no more than 60 mm, such as no more than 30 mm, such as no more than 25 mm.
26. A roof window (1) according to any of the preceding items, wherein an extension (18) is arranged in continuation of the bottom of the exterior glass sheet (3a, 3d, EGS) and extends with an extension distance (DIS2).
27. A roof window (1) according to item 26, wherein the extension (18) is arranged opposite to the bottom edge (3a_be) of the exterior glass sheet (3a, 3d, EGS).
28. A roof window (1) according to item 26 or 27, wherein the extension (18) comprises an exterior surface (18a), such as a surface of an extension body (20), which is configured to be visible from the exterior (EXT) of the building.
29. A roof window (1) according to item 28, wherein said exterior surface (28a) is substantially flush with the exterior major surface (3a2, 3d2) of the exterior glass sheet (EGS, 3a, 3d) which is configured to face away from the interior (INT) of the building, and/or
wherein the exterior surface (18a) of the extension (18) vary with on more than ±5 mm, such as no more than ±3 mm, such as no more than ± 1 mm from the plane (PL1) comprising the exterior surface (3su1) of the exterior glass sheet (3d, 3a, EGS) over at distance of at least 1 cm, such as at least 3 cm or at least 5 cm from the exterior glass sheet bottom edge (3a_be).
30. A roof window (1) according to any of items 26-29, wherein the extension (18) comprises an extension body (20) which is supported by, such as carried by, an extension body support (13, 15, 19), such as wherein the extension body (20) is attached to the extension body support (15, 19), wherein the extension body (20) comprises an exterior, visible surface (18a) configured to face the exterior (EXT) of the building.
31. A roof window (1) according to item 30, wherein the extension body (20) comprises one or more electric circuitries and/or electric components, and/or wherein the functional part is configured to provide an output such as an electric output, such as a power supply output.
32. A roof window (1) according to item 29, 30 or 31, wherein the extension body (20), comprises a photovoltaic module
and/or
wherein the extension body (20) comprises a sensor, for example one or more of a rain sensor, a light sensor, a temperature sensor or a humidity sensor.
33. A roof window (1) according to any of items 28-32, wherein the extension body (20) is supported (19) by, such as carried by, a member comprising a cladding (13, 13a) of the roof window (1).
34. A roof window (1) according to any of items 26-33 and item 2, wherein the extension (18) is supported (13, 15, 19) by the movable frame (2a), such as carried by the movable frame (2a).
35. A roof window (1) according to item 34, wherein the extension (18b, 19, 20) is attached to a profile (2a_bo) of the movable frame by means of one or more mechanical fasteners (34), such as by means of attaching an attachment part (35), such as a bracket, to the profile (2a_bo).
36. A roof window (1) according to any of items 26-35, wherein the extension (18) is supported by, such as mainly carried by, the vacuum insulated glass unit (3).
37. A roof window (1) according to item 36, wherein the extension (18) is supported by, such as mainly carried by, the first projecting glass sheet portion (3p1).
38. A roof window (1) according to any of items 26-35, wherein the extension (18) is substantially unsupported by the exterior glass sheet (3a, 3d, EGS) and/or substantially unsupported by the vacuum insulated glass unit (3).
39. A roof window (1) according to any of items 26-38, wherein the extension (18) comprises a cladding member (13) of the roof window (1), wherein the cladding member comprises a covering part (13b) which is configured to provide water tightening at the bottom (BO) part of the roof window (1),
such as wherein the covering part (13b) extends in a direction away from a plane defined by a major exterior surface of a glass sheet of the vacuum insulated glass unit to a position opposite the exterior of the frame.
40. A roof window (1) according to item 39, wherein the cladding member (13) such as the covering part (3b), is integrated in a member (19, 18b), such as a metal or polymer plate member, comprising said extension (18).
41. A roof window (1) according to item 3 and according to any of items 26-40, wherein the extension (18), such as the extension body (20), overlaps the further structural bottom profile (2b_bo) of the fixation frame (2b).
42. A roof window (1) according to any of items 28-41, wherein an enamel layer (12), such as an enamel layer (12) which is substantially opaque to at least visible light, covers, such as is applied to, a surface of the extension body (20), such as wherein the enamel layer (12) is placed between the extension body (20) and an extension body support (13, 15, 19).
43. A roof window (1) according to any of items 28-42, wherein the thickness of the extension body (20) is lower/smaller than the thickness of the exterior glass sheet (EGS, 3a, 3d), such as wherein the extension body (20) has a thickness that is at least 10% lower, such as at least 25% lower or at least 40% lower than the thickness of the exterior glass sheet (3a, 3d, EGS).
44. A roof window (1) according to any of items 30-43, wherein the extension body (20) is attached to the extension body support (19) by means of one or more fasteners (25a, 25b), such as mechanical fasteners, such as comprising one or more mechanical, releasable fasteners (25b).
45. A roof window (1) according to any of items 26-44, wherein the extension body (20) is replaceably attached at the extension body support (19), and/or wherein the extension (18) is replaceably attached to the frame (2a_bo), such as wherein said replacement may be provided by manipulating one or more mechanical fasteners (34, 36, 25a, 25b).
46. A roof window (1) according to any of items 26-44, wherein the extension (18), such as a profile (13, 15, 19) comprises a mechanical holding member (19a, 19b), such as comprising a holding wall (19a, 19b), which is configured to secure the exterior glass sheet (3a, 3d, EGS) at the bottom thereof.
47. A roof window (1) according to item 46, wherein the mechanical holding member (19a, 19b) comprises a wall (19a) placed opposite to, such as next to, the bottom edge (3a_be, 3d_be) of the exterior glass sheet (3a, 3d, EGS).
48. A roof window (1) according to item 46 or 47, wherein the mechanical holding member (19a, 19b) comprises a hook part (19b) extending to a position opposite to the exterior major surface (3a2, 3d2) of the exterior glass sheet (EGS, 3a, 3d), wherein the hook part is configured to secure the exterior glass sheet (3a, 3d, EGS) at the frame (2).
49. A roof window (1) according to any of items 46-48 and according to item 30, wherein the bottom edge (3a_be, 3d_be) of the exterior glass sheet (3a, 3d, EGS) is placed at a first side of a holding wall (19a) of the mechanical holding member, and wherein the extension body (20) is placed at the opposite side of the holding wall (19b).
50. A roof window (1) according to any of items 26-49, wherein the first projecting distance (DIS1) is no more than 55 mm, such as no more than 45 mm, such as no more than 30 mm.
51. A roof window (1) according to any of items 26-49, wherein the extension distance (DIS2) is at least 10 mm, such as at least 20 mm, such as at least 50 mm.
52. A roof window (1) according to any of items 26-51, wherein the sum (DIS1+DIS2) of the extension distance (DIS2) and the first projecting distance (DIS1) is at least 40 mm, such as at least 60 mm.
53. A roof window (1) according to any of the preceding items, wherein the exterior glass sheet (3a, 3d, EGS) comprises one or more projecting glass sheet portions (3p3) which projects beyond a side edge (3b_se) of the adjacent glass sheet (3b, 3a) with a second projecting distance (DIS3).
54. A roof window (1) according to item 53, wherein the second projecting distance (DIS3) is smaller than the first projecting distance (DIS1).
55. A roof window (1) according to any of items 16-23 and according to any of items 26-52, wherein a wall member providing the step support (15a, 15b, 15) projects beyond the bottom edge (2d_be, 2a_be) of the exterior glass sheet (EGS, 3a, 3d) so as to provide a part (19, 18b) of the extension.
56. A roof window (1) according to item 55, wherein the wall member providing the step support (15a, 15b, 15) comprises a part (13, 13b, 13a) of a cladding (13), preferably wherein said part of the cladding comprises a covering part (13b) which is configured to provide water tightening at the bottom (BO) part of the roof window (1).
57. A roof window (1) according to any of the preceding items, such as according to items 53 or 54, wherein the roof window (1) comprises elongated side water covers (21a, 2b) which overlap the exterior glass sheet (3a, 3d, EGS) surface (3a2, 3d2 3su1) of the vacuum insulated glass unit (3),
- such as wherein the elongated side water covers (21a, 21b) comprises first side water covers (21b), such as lower side water covers, attached to the movable frame (2a) and/or insulating glass unit (3), and second side water covers (21a), such as upper side water covers, attached to a fixation frame (2b) of the roof window (1),
- such as wherein the first and second side water covers (21a, 21b) are arranged in continuation of each other.
58. A roof window (1) according to item 2 and according to item 57, wherein the elongated side water covers (21a, 21b) overlaps a side frame profile (2b_si) of the fixation frame (2b) and/or wherein the elongated side water covers (21a, 21b) overlaps a side frame profile (2a_si) of the movable frame (2a).
59. A roof window (1) according to any of items 53-56 , wherein the second projecting distance (DIS3) is no more than 30 mm, such as no more than 25 mm.
60. A roof window (1) according to any of the preceding items, wherein the glass sheet (3b, 3a) adjacent to the exterior glass sheet (3a, 3d EGS), comprises a fourth projecting glass sheet portion (3p4) which projects beyond the edge (3a_te) of the exterior glass sheet (3a, 3d, EGS) at the top (TO) of the roof window.
61. A roof window (1) according to any of the preceding items, wherein a top cover (24) of the roof window (1) overlaps the exterior major surface (3a2, 3d2, 3su1) of the exterior glass sheet (3a, 3d) at the top (TO) of the roof window (1).
62. A roof window (1) according to any of the preceding items, wherein the exterior surface (3a2, 3d2, 3su1) of the vacuum insulated glass unit (3) is configured to substantially coincide with or be arranged below an exterior plane (PL2) defined by a flashing (22) of the roof window (1) or a roofing (51) when the roof window (1) is installed in a roof structure (50) of the building.
63. A roof window (1) according to any of the preceding items, wherein the exterior major surface (3a2, 3d2, EGS) of the vacuum insulated glass unit (3) is comprised in a first plane (PL1),
wherein the first plane (PL1) is configured to substantially coincide with or be arranged below a second, exterior plane (PL2) defined by a flashing (22) and/or a part (51) of the roof structure, when the roof window is installed in a roof structure (50) of the building.
64. A roof window (1) according to item 63, wherein the first plane (PL1) and the second plane (PL2) are configured to be substantially parallel, such as at least when a movable frame (2a) of the roof window is in a closed position.
65. A roof window (1) according to any of the preceding items, wherein the vacuum insulated glass unit (3) comprises a third glass sheet (3d),
wherein a further insulating gap (7) is placed between a first major surface (3d1) of the third glass sheet (3d) facing the further insulating gap (7) and a major surface (3b2, 3a2) of a glass sheet (3b, 3a) of the vacuum insulated glass unit (3) which faces the further insulating gap (7).
66. A roof window (1) according to item 65, wherein said major surface (3b2, 3a2) of the glass sheet (3b, 3a) of the vacuum insulated glass unit (3) which faces the further insulating gap (7) is a second major surface (3b2) of the second glass sheet (3b) which faces away from the evacuated gap (4).
67. A roof window (1) according to item 65 or 66, wherein said further insulating gap (7) is placed between the lamination layer (6a, 3c) and the evacuated gap (4).
68. A roof window (1) according to item 65, wherein the further insulating gap (7) is the insulating gap of the insulating gaps (4, 7) of the vacuum insulated (3) which configured to be placed proximate the exterior (EXT) of the building,
and/or
wherein said evacuated gap (4) is placed between the further insulating gap (7) and the lamination layer (6a, 3c),
69. A roof window (1) according to any of items 65-68, wherein the further insulating gap (7) is a gas filled gap (7), such as a gap (7) comprising argon gas.
70. A roof window (1) according to any of items 65-69, wherein the third glass sheet (3d) is arranged between the second glass sheet (3b) and a lamination interlayer (6) of the lamination layer (6a, 3c).
71. A roof window (1) according to any of items 65-70, wherein a lamination layer (6) is attached to a major surface (3d2) of the third glass sheet (3d).
72. A roof window (1) according to any of items 65-71, wherein one or more low-e coatings (16b) is/are arranged at the first major surface (3d1) of the third glass sheet (3d).
73. A roof window (1) according to any of items 65-72, wherein the first projecting glass sheet portion (3p1) projects beyond a bottom edge (3d_be) of the third glass sheet (3d).
74. A roof window (1) according to any of items 65-73, wherein the third glass sheet (7d) is the exterior glass sheet (EGS).
75. A roof window (1) according to any of items 65-74, wherein the further insulating gap (7) overlaps, such as partly or fully overlaps, the edge seal (9) which encloses the evacuated gap (4).
76. A roof window (1) according to any of items 65-74, wherein the edge seal (9) which encloses the evacuated gap (4) partly or fully overlaps an edge seal (7a) which encloses the further insulating gap (7).
77. A roof window (1) according to any of items 65-74, wherein the evacuated gap (4) overlaps, such as partly or fully overlaps, an edge seal (7a) which encloses the further insulating gap (7).
78. A roof window (1) according to any of items 65-77 and/or according to any of items 11-14, wherein an enamel layer (12) covers a part of the evacuated gap (4) and/or the further insulating gap (7)
79. A roof window (1) according to any of the preceding items, wherein the roof window (1) comprises a cladding member (13), wherein the cladding member (13) comprises a covering part (13b) configured to provide water tightening at the bottom (BO) part of the roof window (1).
80. A roof window (1) according to item 79, wherein the covering part (13b) covers a bottom part of the roof window (1) wherein the covering part (13b) extends to a position opposite a bottom part of the fixation frame (2b),
such as wherein the covering part (13b) extends in a direction away from a plane (PL1) comprising a major surface of a glass sheet (3a, 3b, 3c, 3d) of the vacuum insulated glass unit (3), to a position opposite the exterior of the frame (2), such as the exterior of a fixation frame (2b).
81. A roof window (1) according to any of items 79-80, wherein the cladding member (13) comprises a shield (13a) and/or a connection part (13a), which overlaps the exterior major surface (3a2, 3d2, 3su1) of the first projecting glass sheet portion (3p1) configured to face away from the building interior (INT).
82. A roof window (1) according to item 81, wherein the shield, such as the connection part (13a), is supported by, such as attached (13c) to, the exterior major surface (3a2, 3d2, 3su1) of the first projecting glass sheet portion (3p1) configured to face away from the building interior (INT).
83. A roof window (1) according to item 81 or 82, wherein the shield (13a), such as the connection part (13a) is unitary with the covering part (13b) and/or wherein a part of the shield which is unattached to the exterior major surface (3a2, 3d2, 3su1) extends over the exterior major surface (3a2, 3d2, 3su1) of the first projecting glass sheet portion (3p1) with a distance to the exterior major surface (3a2, 3d2, 3su1).
84. A roof window (1) according to any of items 79-83, wherein the cladding member (13), such as the shield (13a), such as the connection part (13a), provides mechanical shielding of the first projecting glass sheet portion (3p1).
85. A roof window (1) according to any of items 79-84, wherein the cladding member (13), such as the connection part (13a) and/or covering part (13b), comprises or consist of a sheet material, such as a metal sheet material, such as a metal sheet material comprising one or more bends.
86. A roof window (1) according to item 2 and according to any of items 79-85, wherein the covering part (13b) and/or the connection part (13a) is/are visible from the outside of the window when the movable frame (2a) is in a closed position.
87. A roof window (1) according to item 2 or 3 and according to any of items 79-86, wherein the cladding member (13) comprises a connection part (13a) which extends in between the first projecting glass sheet portion (3p1) and a bottom frame profile (2b_bo) of the fixation frame (2b).
88. A roof window (1) according to any of the preceding items, wherein the exterior glass sheet (3a, 3d, EGS) comprises a projecting glass sheet portion (3p5) at the top (TO) of the roof window (1), which projecting glass sheet portion (3p5) projects beyond a top edge (3b_te) of the adjacent glass sheet (3b, 3a).
89. A roof window (1) according to item 88, wherein a gasket (23) of the roof window comprises one or more parts (23a, 23b), such as one or more gasket lips, which support on said projecting glass sheet portion (3p5),
such as wherein said one or more gasket parts (23a, 23b) supports directly on the exterior surface (3a2, 3d2, EGS) of the exterior glass sheet (3a, 3d, EGS) at the projecting glass sheet portion (3p5) that projects beyond a top edge (3b_te) of the adjacent glass sheet (3b, 3a)..
90. A roof window (1) according to any of the preceding items, wherein the vacuum insulated glass unit (3) comprises just one insulating gap (4) which is the evacuated gap.
91. A roof window (1) according to any of the preceding items, wherein one or more low-e coatings (16) is/are arranged at the major surface (3b1) of the second glass sheet (3b, 3a) facing towards the insulating gap (4, 7) and towards the exterior glass sheet (3a, 3d, EGS).
92. A roof window (1) according to any of the preceding items,
wherein a gripping member (8a) of one or more mechanical fastening parts (8) extends in between glass sheets (3a, 3b, 3c, 3d) of the vacuum insulated glass unit (3) so as to provide a fixation of the vacuum insulated glass unit (3) to the frame (2, 2a)
93. A roof window (1) according to item 89 and according to any of items 65-78, wherein the gripping member (8a) extends in between the exterior glass sheet (3a, 3d) and the third glass sheet (3d) of the vacuum insulated glass unit (3).
94. A roof window (1) according to any of the preceding items, wherein the first and second glass sheets (3a, 3b) are tempered glass sheets such as thermally tempered glass sheets.
95. A roof window (1) according to any of the preceding items, wherein the first projecting glass sheet portion (3p1) projects beyond a bottom edge (3a_be, 3b_be, 3c_be, 3d_be,) of all other glass sheets (3a, 3b, 3c, 3d) of the vacuum insulated glass unit (3).
96. A roof window (1) according to any of the preceding items, wherein the roof window is of the type configured to be installed in a roof structure having a roof pitch above 17°, such as above 30° relative to horizontal.
97. A roof window (1) according to any of items 2-96, wherein the glass unit (3), including the first projecting glass sheet portion (3p1) extends over the entire width (W1) of the bottom profile (2a_bo) of the movable frame (2a), and over at least 20%, such as over at least 50%, such as over at least 90% of the width (W2) of the bottom profile (2b_bo) of the fixation frame (2b).
98. A roof window (1) according to any of items 2-97, wherein the first glass sheet (3a) and/or second glass sheet (3b) has a thickness of between 2.5 mm and 5 mm, such as between 3 mm and 4.5 mm, such as 3 mm or 4 mm.
99. A roof window (1) according to any of the preceding items, wherein at least one insulating gap (4, 7) of the glass unit (3) is arranged between a major surface (3a1, 3d1) of the exterior glass sheet (3a, 3d) and a major surface (3b1, 3a2) of a glass sheet (3a, 3b) of the vacuum insulated glass unit (3) which is adjacent to the exterior glass sheet (3a, 3d) of the vacuum insulated glass unit.
100. A roof window (1) according to item 99, wherein said insulating gap is said evacuated gap (4), and wherein said second glass sheet (3b) is said adjacent glass sheet (3a).
101. A roof window (1) according to any of the preceding items, wherein the total surface area of a major surface (3a1, 3a2, 3d1, 3d2) of the exterior glass sheet (EGS, 3a, 3d) is larger than the total surface area (3b1, 3b2, 3a1, 3a2, 3d1, 3d2) of the adjacent glass sheet (3a, 3b, 3d).
102. A roof window (1) according to any of the preceding items, wherein the roof window (1 ) is configured to be installed in a roof structure (50) having a roof pitch above 17°, such as above 30°, relative to horizontal.
103. A roof window (1) according to any of the preceding items, wherein the frame comprises a fixation frame (2b) comprising a top frame profile (2b_to) at the top (TO) of the roof window, a bottom frame profile (2b_bo) at the bottom (BO) of the roof window, and side frame profiles (2b_si) extending between the top profile (2b_to) and bottom profile (2b_bo) of the fixation frame (2b), wherein said profiles encloses a frame opening (FO2).
104. A roof window (1) according to any of the preceding items, wherein the frame comprises a movable frame (2a) comprising a top frame profile (2a_to) at the top (TO) of the roof window, a bottom frame profile (2a_bo) at the bottom (BO) of the roof window, and side frame profiles (2a_si) extending between the top profile (2a_to) and bottom profile (2a_bo) of the movable frame (2a), wherein said profiles encloses a frame opening (FO1) wherein the vacuum insulated glass unit (3) is attached to the movable frame (2a).
105. A roof window (1) according to any of the preceding items, wherein the roof window is of the centre hung type.
106. A roof window (1) according to any of the preceding items, wherein the roof window (1) is of the top hung type.
107. A roof window (1) according to item 106, wherein the roof window is of the non-centre hung type.
108. A roof window (1) according to any of the preceding items, wherein one or more of the edge(s) of the vacuum insulated glass unit (3) which is/are arranged along the top (TO), bottom (BO) and/or side(s) (SI1, SI2) of the roof window (1) are insulated by means of edge heat insulation (not illustrated) that is arranged opposite to the edge region of the VIG unit,
such as wherein the edge heat insulation is configured so as to reduce heat transfer at the area of the edge seal (9) enclosing the evacuated gap (4) when compared to a scenario where the edge heat insulation is omitted.
109. A building comprising one or more roof windows (1) according to any of the preceding items installed in a roof structure (50) of the building.

List (non-exhaustive)

1: : Roof window
2: : frame
2a: : movable frame
2a_bo: : bottom profile of movable frame
2a_to: : top profile of movable frame
2a_si: : side profile of movable frame
2b: : fixation frame
2b_bo: : bottom profile of fixation frame
2b_to: : top profile of fixation frame
2b_si: : side profile of fixation frame
3: : vacuum insulated glass unit
3a: : First glass sheet (may or may not be exterior glass sheet EGS)
3a_te: : top edge of first glass sheet
3a_be: : bottom edge of first glass sheet
3a_se: : side edge of first glass sheet
3b: : second glass sheet
3b_te: : top edge of second glass sheet
3b_be: : bottom edge of second glass sheet
3bp: : portion of second glass sheet which projects beyond edge seal 9
3c: : lamination glass sheet
3c_be: : bottom edge of lamination glass sheet.
3d: : third glass sheet
3p1: : projecting glass sheet portion at roof window bottom
3p2: : projecting glass sheet portion which projects beyond lamination layer
3p3: : projecting glass sheet portion which projects beyond a side edge of adjacent glass sheet
3p4: : projecting glass sheet portion which projects beyond edge of exterior glass sheet at roof window top
3p5: : projecting glass sheet portion which projects beyond top edge of the adjacent glass sheet
3su1: : exterior major surface of glass unit facing towards exterior of building
3su2: : exterior major surface of glass unit facing towards interior of building
4: : evacuated gap
5: : support structure
6: : lamination interlayer
6e: : edge of lamination interlayer
7: : further insulating gap
7a: : edge seal enclosing further insulating gap
8: : mechanical fastening part 8 comprising gripping member
8a: : gripping member of mechanical fastening part
9: : edge seal enclosing evacuated gap
11: : protection sealing
12: : enamel providing masking
13: : cladding member
13a: : connection part of cladding
13b: : covering part of cladding
14: : gasket member
15: : step support providing support of first projecting glass sheet portion
16a, 16b: : Low-e coating(s)
17: : support elevation, such as resilient support elevation
18: : extension
18a: : exterior extension surface
18b: : extension member
19: : extension body support
19a: : holding wall is configured to secure the exterior glass sheet at bottom
19b: : hook part configured to secure the exterior glass sheet at bottom
20: : extension body
21a, 21b: : side water cover
22: : flashing
23, 23a, 23b: : top gasket
24: : top cover
24a: : covering surface of top cover
25a, 25b: : fastener for fastening extension body at extension body support
26: : gasket between glass unit and profile of movable frame
27: : handle
27a: : handle base part
28: : gasket engaging with and/or comprised in cladding bottom part
31: : tightening gasket configured to provide tightening between movable frame and fixation frame.
33, 33a, 33b: : adhesive such as adhesive tape or glue
34: : mechanical fastener
35: : attachment part, such as a plate and/or a bracket/mounting, for attaching member to profile of movable frame
36: : installation guide
37: : sealing
38: : side water channel
39a, 39b: : side edge surface of water cover
40: : resilient protection
50: : building roof structure
51: : roofing
52: : roof batten
60: : hinge
DIS1: : distance with which exterior glass sheet portion projects beyond a bottom edge of second glass sheet 3b
DIS2: : extension distance
DIS3: : Projection distance of exterior glass sheet portion 3p3 at roof window side
DIS4: : Projection distance of exterior glass sheet portion 3p5 at roof window top
EXT: : Exterior of building
INT: : Interior of building
FO1: : Frame opening provided between profiles of movable frame
FO2: : Frame opening provided between profiles of fixation frame
SI1, SI2: : Sides of roof window
TO: : roof window top
BO: : roof window bottom
EGS: : Exterior glass sheet
HD: : height direction of roof window
WD: : width direction of roof window
CEGU: : centre of glass unit
RAX: : Rotation axis
PL1: : Plane comprising exterior glass sheet surface 3su1
PL2: : Plane comprising exterior of roofing or exterior of flashing.

Claims

A roof window (1) for installation in a roof structure (50) of a building, wherein the roof window (1) comprises
- a frame (2, 2a, 2b), and

- a vacuum insulated glass unit (3) supported by the frame (2),wherein the vacuum insulated glass unit (3) comprises a first glass sheet (3a) and a second glass sheet (3b), wherein an insulating, evacuated gap (4) is placed between the first glass sheet (3a) and the second glass sheet (3b), wherein a plurality of support structures (5) are distributed in the evacuated gap (4) so as to maintain a distance between a first major surface (3a1) of the first glass sheet (3a) facing towards the evacuated gap (4) and a first major surface (3b1) of the second glass sheet (3b) facing towards the evacuated gap (4), wherein an edge seal (9) encloses the evacuated gap (4),

wherein the first glass sheet (3a) is configured to be placed closer to the exterior (EXT) of the building than the second glass sheet (3b) when the roof window (1) is installed in a building roof structure (50),

wherein the vacuum insulated glass unit (3) comprises an exterior glass sheet (EGS, 3a, 3d) comprising an exterior major surface (3a2, 3d2) configured to face towards the exterior (EXT) of the building,

wherein the exterior glass sheet (3a, 3d, EGS) comprises a first projecting glass sheet portion (3p1) which projects beyond a bottom edge (3b_be) of the second glass sheet (3b) with a first projecting distance (DIS1),

wherein the first projecting glass sheet portion (3p1) overlaps one or more structural bottom profiles (2a_bo, 2b_bo) of the frame (2, 2a, 2b),

wherein the vacuum insulated glass unit (3) comprises a lamination layer (6, 3c).
A roof window (1) according to claim 1, wherein the frame comprises a movable frame (2a) and a fixation frame (2b), wherein the movable frame (2a) is configured to move, such as pivot, relative to the fixation frame (2b) by means of one or more hinges (60), wherein the vacuum insulated glass unit (3) is attached to the movable frame (2a) and is configured to move together with the movable frame (2a),
such as wherein the roof window (1) is a roof window (1) of the centre hung type.
A roof window (1) according to any of the preceding claims, wherein the lamination layer (6, 3) comprises a lamination interlayer (6) and a lamination glass sheet (3c).
A roof window (1) according to any of the preceding claims, wherein the lamination layer (6, 3) comprises a lamination interlayer (6), wherein the lamination interlayer has a thickness above 0.5 mm, such as above 0.7 mm, such as above 1 mm or above 1.4 mm.
A roof window (1) according to any of the preceding claims, wherein said first glass sheet (3a) is configured to be said exterior glass sheet (EGS),
A roof window (1) according to any of the preceding claims, wherein the first projecting distance (DIS1) is at least 6 mm, such as at least 25 mm, such as at least 45 mm, and/or
A roof window (1) according to any of the preceding claims, wherein the first projecting distance (DIS1) is no more than 60 mm, such as no more than 30 mm, such as no more than 25 mm.
A roof window (1) according to any of the preceding claims, wherein one or more glass sheets (3a, 3b) arranged between the exterior glass sheet (3a, 3d EGS) and the lamination layer (3c, 6) comprises a second projecting glass sheet portion (3p2), wherein the second projecting glass sheet portion (3p2) projects beyond an edge, such as a bottom edge (3c_be, 6e), of the lamination layer (3c, 6).
A roof window (1) according to any of the preceding claims, wherein the vacuum insulated glass unit (3) comprises a protection sealing (11), wherein the protection sealing covers the edge seal (9), such as a solder edge seal, such as a glass solder edge seal or metal solder edge seal, enclosing the evacuated gap (4),
wherein the first glass sheet (3a, 3p1) overlaps the protection sealing (11),

such as wherein the protection sealing (11) is a resilient, water tightening sealing.
A roof window (1) according to any of the preceding claims, wherein the vacuum insulated glass unit (3) comprises an enamel layer (12), such as an enamel layer (12) which is substantially opaque to at least visible light,
wherein the enamel layer (12) covers, such as is applied to, a surface (3a1, 3p1s) of the first projecting glass sheet (3a, 3d, EGS) portion (3p1),
A roof window (1) according to any of the preceding claims, wherein the enamel layer (12) extends into the evacuated gap (4) and/or wherein the enamel layer (12) extends in between the first glass sheet (3a) and the edge seal (9).
A roof window (1) according to any of the preceding claims, wherein the roof window (1) comprises one or more step supports (15, 15a, 15b) configured to support the first projecting glass sheet portion (3p1),
such as wherein a sheet, such as a metal sheet, comprises said step support (15).
A roof window (1) according to claim 12, wherein one or more of the one or more step supports (15, 15a, 15b) is/are attached to a profile (2a_bo) of the frame (2),
such as wherein the step support(s) (15, 15a, 15b) is/are attached to a bottom profile (2a_bo) of a movable frame (2a) of the frame (2).
A roof window (1) according to any of claims 12-13, wherein one or more of the one or more step supports (15, 15a, 15b) is attached to the first projecting glass sheet portion (3p1),
such as by means of one or more an adhesives (33, 33a, 33b), such as by means of an adhesive tape and/or a glue.
A roof window (1) according to any of claims 12-14, wherein one or more of the one or more step supports (15, 15a, 15b) comprises one or more resilient support elevations (17, 33, 33a, 33b),
such as wherein said one or more resilient support elevations comprises discretely arranged support elevations, such as wherein said one or more resilient support elevations comprises one or more adhesives (33a, 33b).
A roof window (1) according to any of claims 12-15, wherein a member providing the step support (15a, 15b, 15) comprises a part (13, 13b, 13a) of a cladding (13) configured to provide water tightening at the bottom (BO) part of the roof window (1) , such as wherein said part of the cladding (13) comprises a covering part (13b) which extends in a direction away from a plane (PL) comprising a major exterior surface (EGS) of a glass sheet of the vacuum insulated glass unit, to a position opposite the exterior of the frame (2, 2b).