BE1020482A3 - ROOF COVER SYSTEM AND METHOD FOR HORIZONTALLY MULTI-LAYER TRANSPARENT PANEL ON FLAT ROOF. - Google Patents

Description

ROOF COVER SYSTEM AND METHOD FOR HORIZONTALLY MULTI-LAYER TRANSPARENT PANEL ON FLAT ROOF

DOMAIN OF THE INVENTION

The invention relates to a roofing system for a flat roof with a substantially horizontally placed multilayer transparent panel and a method for applying a transparent multilayer panel substantially horizontally to a flat roof.

STATE OF THE ART

There are various possibilities for light entry into flat roofs, such as, for example, saddle-shaped roof coverings, whereby light-transmitting plates are usually placed at an angle to the flat roof. However, such systems are expensive because of the complexity and because more transparent flat plates are needed.

DE4208741 describes a roofing system with a multi-layered transparent panel. However, a disadvantage of this system is that it is not sufficiently watertight.

DISCLOSURE OF THE INVENTION

It is an object of the present invention to provide a roofing system with a substantially horizontally placed multi-layer light-transmitting panel for a flat roof that is watertight.

This object is achieved with a roofing system with the technical features of the first claim.

To that end, a roofing system according to the invention comprises a multi-layer light-transmitting, for example transparent, panel with a lower and an upper plate which are connected to each other, wherein the multi-layer panel is arranged substantially horizontally on the flat roof, and wherein the lower plate rests near its perimeter on a third seal to prevent water from infiltrating below the lower plate, wherein: the upper plate has an overlapping portion that overlaps the lower plate, and has an overhanging portion that extends beyond an edge of the lower plate for draining off rain water falling on the top plate; - wherein a first seal is provided on an upper side of the upper plate to prevent rainwater from infiltrating to the lower plate via an edge of the upper plate; - and wherein a second seal is provided on a lower side of the overhanging portion of the upper plate to prevent the rain water that has flowed over the edge of the overhanging portion from reaching the lower plate. The roofing system is preferably watertight in use.

By applying the first seal, it is prevented that the rainwater that falls on the upper plate can drain off along the side of the multi-layer panel. The rainwater will therefore only be able to leave the upper plate via the overhanging section. When the rainwater reaches the edge of the upper plate, most of the water will fall down, and therefore not reach the lower plate. The small portion that nevertheless moves along the bottom of the upper plate in the direction of the lower plate is then retained by the second seal. Should some rainwater still infiltrate through the first and the second seal, this is stopped by the third seal that is located under the bottom plate. In this way the roofing system is completely watertight. It will thus be clear that, in use, a waterproof roofing system in use can be achieved thanks to the provision of at least the third seal, more preferably thanks to the provision of both the first seal, the second seal, and the third seal.

Because the multi-layer panel is placed almost horizontally on the flat roof instead of at an angle (for example 30 ° -45 ° to the roof), a multi-layer panel with smaller dimensions can suffice to cover a certain roof opening, which means a considerable cost saving (for example 20-30% of the cost of the multi-layer panel).

An additional saving can be achieved because the profiles of the supporting structure do not have to be cut at an angle (of for example 45 °), but can be cut straight, which means less material loss and faster assembly.

Thanks to the seals at the bottom of the bottom plate and at the top of the top plate, which are usually made of a soft material, the multi-layer panel can be attached to the flat roof without scratches or other damage, and tolerance differences can be absorbed. Furthermore, the seals allow a difference in thermal expansion between different materials of the roofing system.

According to the invention, the first seal is provided with a soft plastic that comprises a multiple seal. Experiments carried out by the inventors have shown that with a multiple seal a relatively good seal against rain water can be obtained.

According to the invention, the multiple seal comprises at least two seal elements, preferably at least three seal elements, wherein at least one of the seal elements has a shape that differs from at least one of the other seal elements. The at least one of the sealing elements is preferably a closed sealing element. The at least one of the remaining sealing elements is preferably an open sealing element. The sealing elements are preferably positioned such that rainwater, upon infiltration, must first pass through the at least one closed sealing element before the rainwater reaches the at least one open sealing element, although it can also be reversed. The sealing elements are preferably provided with at least one deformation zone. Experiments carried out by the inventors have shown that an improved seal against rain water can be obtained with such sealing elements.

The first seal is preferably arranged so that, in use, the rainwater can only leave the upper plate via the overhanging portion.

In one embodiment, at least over a portion of the circumference, the third seal comprises a first soft portion, e.g., top, and a second soft portion, e.g., bottom. Preferably, the lower plate rests near its circumference on the first soft portion of the third seal to prevent water from infiltrating below the lower plate.

In one embodiment, the third seal is provided, at least over a portion of the circumference, with a bottom portion, a first wall portion extending upwardly from the bottom portion, and a second wall portion extending away from the first wall portion from the bottom portion extends upwardly so that the third seal between the bottom portion and the wall portions forms a channel for draining infiltrated rainwater. In one embodiment, the bottom portion and the first wall portion are formed by the first soft portion and the second wall portion is formed by the second soft portion. In one embodiment, the lower plate rests near its circumference on the second wall portion of the third seal to prevent water from infiltrating below the lower plate. In this way, the third seal can optionally provide both a seal and drainage of water through the channel.

In one embodiment, the third seal is provided with at least one weakening zone at a transition from the first soft portion to the second soft portion. In one embodiment, the third seal is provided with at least one weakening zone at a transition from the bottom portion to the first wall portion.

The roof covering system according to the invention preferably further comprises a first resp. second profile that cooperates with the first resp. second seal for forming a first resp. second ventilation duct for allowing air circulation in addition to a first resp. second side of the multi-layer panel. The first profile preferably has an upright portion which is placed at a distance from the first side. The second profile is preferably placed at a distance from the second side. Preferably, the second profile has a lying portion that is mounted against the second seal under the overhanging portion of the upper plate.

The first profile can be understood to mean both a formed profile (for example L-profile, U-profile or an extruded profile of any shape), as well as a folded flat plate.

By allowing air circulation next to the sides of the multi-layer panel, condensation is prevented therein. This is an important advantage, since many manufacturers of multilayer glass panels only guarantee against condensation inside the multilayer panel if ventilation air can flow along all sides of the multilayer panel.

The first and second profiles furthermore provide an aesthetic finish to the whole, and allow invisible air circulation and drainage.

The roofing system preferably further comprises an insulating block and an insulating layer respectively attached to the first resp. second profile for forming a first resp. second thermal break between the environment and the first resp. second side of the multi-layer panel.

By using such a first profile with the insulating block on the one hand, and the second profile with the insulating bearing on the other hand, the lower plate, which is in direct contact with the inside temperature (for example in the veranda), can be shielded from the outside temperature . In this way the lower plate is exposed to fewer thermal stresses, which improves the service life of the multi-layer panel.

The second profile is preferably placed at an angle β of 1-6 °, preferably substantially 5 ° with respect to the flat roof, to promote drainage of the rain water that is present on the second profile.

In this way, the rainwater falling over the edge of the overhanging portion of the upper plate will flow away from the multi-layer panel, thereby greatly reducing the chance of infiltrating water beyond the second seal further.

Preferably, the roofing system further comprises a first base profile placed on a bottom of the first ventilation channel between the insulating block and the first side of the multi-layer panel for collecting and draining infiltrated rainwater and condensed water from the first ventilation channel.

Due to the appropriate shape and placement of the first basic profile, rainwater that has nevertheless been infiltrated on the first side can still be drained past the first seal, so that moisture problems such as rot or rust are avoided.

Preferably, the third seal covers the first base profile so that contact of rainwater with the first base profile is substantially prevented.

The insulating layer preferably has at least one drainage channel for collecting and draining infiltrated rainwater and condensed water from the second ventilation channel.

By providing such a shelf with at least one drainage channel, air circulation can also be provided along the second side of the multi-layer panel, and the water that has nevertheless been infiltrated beyond the second seal can still be discharged.

In one embodiment, the ambient air only has contact with the lower plate via the drainage channel of the insulating layer.

In one embodiment the shelf is mounted at a distance from the panel so that an opening is provided over substantially the entire length of the shelf, which is in contact with the outside air via the discharge channel, for providing ventilation on a side of the panel. A relatively good ventilation can be achieved in this way.

The first and the second plate are preferably substantially rectangular.

Preferably, the upper plate has a first and a second overhanging portion on two opposite sides thereof for draining rain water onto the upper plate on either side of the upper plate.

By providing two overhanging sections located opposite to each other, the rainwater on the upper plate can be drained even easier and faster, even with wind from any direction.

Preferably, the multi-layer panel in a position between the two overhanging portions has an elevation for forming a slope to the edge of the overhanging portions for promoting drainage of the rainwater located on the upper plate.

This slope can be achieved, for example, by placing the multi-layer panel on a frame (or frame) with the desired curvature, and tensioning the multi-layer panel against it with the aid of the first profile. The first and third seals prevent any damage.

In one embodiment, the roofing system according to the invention comprises at least a first and a second light-transmitting, e.g. transparent, multi-layer panel, placed side by side and spaced apart to form a third ventilation channel therebetween; - wherein each multi-layer panel comprises an upper and a lower plate; and wherein a third profile is placed between and above the upper plates with first seals connecting to the upper plates, to prevent rainwater from infiltrating into the third ventilation channel; - and wherein each lower plate rests on third seals to prevent rainwater from infiltrating below the lower plates; - and wherein a second base profile is placed on a bottom of the third ventilation channel between the two multi-layer plates for collecting and draining infiltrated rainwater and condensed water from the third ventilation channel.

Because the roof covering system is provided for placing one or more plates on the opening of a flat roof, openings of widely varying dimensions can be covered. The same advantages as described above for a roofing system with one multi-layer panel also apply to the system with several sheets. For example, here too a thermal interruption is obtained between the external and internal temperature by using a (thermally) insulating third profile, and the third ventilation channel can also be used here both for air circulation and for draining off possibly infiltrated water and condensed water .

To this end, in an embodiment the third ventilation channel is open along at least one of its ends, for draining infiltrated rainwater and condensed water from the third ventilation channel, preferably similar to the discharge from the first ventilation channel.

Alternatively, or additionally, the third ventilation channel flows out onto the insulating shelf for draining infiltrated rainwater and condensed water from the third ventilation channel along the at least one drainage channel of the layer, preferably similar to the drainage from the second ventilation channel.

In one embodiment, the third seal covers the second base profile so that contact of rainwater with the second base profile is substantially prevented. As a result, corrosion of the second basic profile can be reduced, or possibly substantially prevented.

In one embodiment the second basic profile has a provision on either side for mounting a third seal.

As a result, contact of rainwater with the second basic profile is substantially prevented on both sides of the second basic profile.

In one embodiment at least one of the first seals connects to one of the upper plates to prevent rainwater infiltration into the third ventilation channel, is provided with a soft plastic part in contact with one of the upper glass plates for clamping thereof, wherein the soft plastic comprises the multiple seal.

In one embodiment, the multi-layer transparent panel is a multi-layer glass panel. In one embodiment, the multilayer glass panel is a three-layer or four-layer glass plate, with a lower plate in contact with a middle plate, and with an upper plate separated from the middle plate by an air cavity closed by an edge seal.

The roofing system is preferably built on a support structure mounted on top of the flat roof. Preferably, profiles of the support structure are straight cut.

In this way, the roofing system does not have to be connected watertight to an existing wall or facade, and the dimensions of the multi-layer panel can be chosen freely, so that cutting losses can be avoided.

Preferably, the multi-layer panel is arranged substantially horizontally on the flat roof.

The invention also provides a method for applying a light-transmitting, e.g., transparent, multi-layered panel, substantially horizontally, to a flat roof, according to claim 32.

BRIEF DESCRIPTION OF THE FIGURES

The invention is further elucidated on the basis of the description below and the accompanying figures. Note that the figures are not necessarily drawn to scale. The figures serve to describe the principles of the invention. The same elements are numbered equally across the various drawings. The person skilled in the art can combine different characteristics from the different figures.

Figure 1 shows an example of a veranda with a flat roof on which a roof covering system according to the invention is mounted. This roofing system comprises four transparent panels.

Figure 2 is a principle drawing in perspective view. It shows a roofing system according to the invention, one fourth of which has been cut away for illustrative reasons.

Figure 3A shows in top view an example of an upper plate with two overhangs, and a possible position of the first and second seal relative to the lower and the upper plate.

Figure 3B shows in side view a multi-layer panel with two overhanging sections, which shows a curvature in the middle.

Figure 3C shows in top view an example of an upper plate with only one overhanging part, and a possible position of the first and second seal relative to the lower and the upper plate.

Figures 4-12 show a specific example of a roofing system according to the invention with two multi-layer panels.

Figure 4 shows a preferred embodiment of the roofing system according to the invention, mounted on a flat roof in perspective view. The position of various sections shown in the following figures are indicated on it.

Figure 5 shows an exploded view with the main components of the roofing system of Figure 4.

Figure 6 shows a cross section of the roof covering system of Figure 4 according to the cut A-A. On the right in Figure 6, a rotated cut is shown according to section D-D.

Figure 7 shows an enlargement of a detail of Figure 6.

Figure 8 shows a cross-section of the roofing system of Figure 4 according to the cut B-B. On the right in Figure 8, a rotated cut is shown according to section D-D.

Figure 9 shows a cross-section of the roofing system of Figure 4 according to the cut C-C.

Figure 10 shows in detail a section of the roofing system of Figure 4 according to the cut D-D.

Figure 10A shows an example of a third seal. Figure 10B shows an example of a first seal.

Figure 11 shows in detail an example of an insulating layer with two drainage channels, as can be used in the roofing system of Figure 4.

Figure 12 shows a frame in detail, as can be used in the roofing system of Figure 4.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

REFERENCES: 1 roofing system 2 flat roof 21 roof beam 22 framework 23 support structure 24 veranda 25 milling 3 multi-layer transparent panel 31 bottom plate 32 middle plate 33 air cavity 34 top plate 35 edge seal 361 first side of multi-layer panel 362 second side of multi-layer panel 37 overlapping section ( of upper plate) 38 edge of upper plate 39 overhanging part (of upper plate) 41 first seal 42 second seal 421 soft part (of second seal) 422 hard part (of second seal) 43 seal 431 first soft part of seal 43 432 second soft part of seal 43 44 seal strip 45 seal profile 451 hard part (of seal profile) 452 soft part (of seal profile) 453 multiple seal 51 first profile 514 insulating block 52 second profile 521 seal ring 522 V-groove 523 first screw 53 insulating bearing 54 drain channel 55 spacer 56 third profile 57 central profile 58 first basic profile 59 t second base profile 61 first water channel / ventilation channel 62 second water channel / ventilation channel 63 third water channel / ventilation channel 70 optional interior finish 71 plastic head plate 73 second screw (top of the third profile) 74 roundel or distributor plate 75 third screw (bottom of the central profile) 76 roofing membrane 77 connection of first profile against roofing membrane 78 infiltrating water 79 condensation water 80 notch (in support structure) 81 bottom of notch (in support structure) 82 plastic sealant 83 ventilation of the edge seal of the multi-layer panel 84 drainage of the condensation water of the multi-layer panel 85 drainage of the water channels 90 first sealing element 91 second sealing element 92 third sealing element 93 deformation zone 94 air duct 95 tear-off zone 96 second wall part 97 bottom part

The invention relates to a roofing system 1 for a flat roof 2 with a multilayer transparent plate 3, for example manufactured from plexiglass or from multilayer glass. For the sake of simplicity, furthermore only glass plate will be discussed, but the invention is not limited thereto.

Figure 1 shows such a roofing system 1 applied to a flat roof 2 of a veranda 24, but the invention is not limited thereto, and can also be used on other flat roofs 2, both in new construction and when renovating existing buildings. Preferably, not the entire roof surface is made transparent, but the roof covering system 1 is mounted on a support structure 23 (for example of wood) which is placed on the roof 2. In this way the light in the summer is limited. This also offers the advantage that the roofing system 1 does not have to be watertightly connected to an existing wall or facade (a watertight connection to an existing curve or rough wall can hardly be guaranteed). Moreover, as a result, the dimensions of the roofing system 1 do not have to be precisely matched to the dimensions of the flat roof 2. This also allows lighting elements (for example "spots") to be built into the part of the flat roof 2 next to the opening. The roofing system 1 shown has four transparent panels 3, but a different number, for example one, two, three or more than four, is also possible.

One of the major advantages of the present invention is that it allows to place a glass plate 3 in a horizontal position on a flat roof 2, where two glass plates are traditionally always placed against each other at an angle of for example 30 ° - 45 ° , which means more material is needed. By placing the glass plate on the roof 2 in a substantially horizontal position, the multi-layer panel 3 can have a smaller surface area, and thus material costs can be saved. Because the dimensions of the glass plate 3 are independent of the outer dimensions of the roof 2, the cost price of the glass can be reduced even further, because an "economic size" can be chosen for the glass. Glass is typically cut from a large plate (from 6.00 m x 3.00 m, for example), and by choosing a standard size there are no or fewer cutting losses.

In addition to the cost price aspect, the roofing system 1 of the present invention also focuses on reducing energy loss (by avoiding thermal bridges), avoiding thermal stresses in the multi-layer glass panel, its watertightness (ie preventing rainwater from infiltrating into the interior space ), and the avoidance of condensed water in and around the multi-layer panel. In this way a roofing system 1 with a high quality and a long service life is obtained. Next, it will be explained in detail how these characteristics are obtained.

Figure 2 shows an example of a roofing system 1 according to the present invention, with one glass plate 3, with certain parts removed for illustrative reasons. The main features will be explained on the basis of this figure. Shown is a transparent multi-layered flat glass plate 3 with a lower glass plate 31 and an upper glass plate 34 connected to each other. (This will be described in more detail in Figure 7). The lower glass plate 31 rests on a third seal 43, 44 (e.g., a flexible seal rubber or flexible seal strip also known as, for example, "mousse" or "glass band" or "cell band", or a combination of seal elements / strips) to infiltrate rainwater under the bottom plate 31. The upper plate 34 has a larger surface area than the lower plate 31, more specifically it has an overlapping portion 37 that overlaps the lower plate 31, and an overhanging portion 39 that extends beyond the lower plate 31. This aspect is further explained in Figure 3A .

Figure 3A shows in top view an example of an upper glass plate 34 and the lower glass plate 31 attached thereto. In one embodiment, both plates are rectangular, with or without rounded corners, and the upper glass plate 34 has two overhanging sections 39a, 39b. According to the invention, a first seal (e.g., a seal rubber) 41 is provided on an upper side of the upper plate 34 to prevent rainwater from flowing to the lower plate 31 via a side edge 38b, 38d (see Figure 2). In this way, rainwater falling on the upper plate 34 is forced to go to the other side edges 38a, 38c, where the majority will fall down on the second profile 52. At the bottom of the overhanging portion 39 of the upper glass plate 34 is a second seal (for example a seal rubber) 42 arranged around the little rainwater that still wants to flow past the edge 38a, 38c to the bottom plate 31. As a result, the second sealing rubber 42 only has to process a small portion of the rainwater, and this portion is subsequently retained by the third sealing 43, 44 at the bottom of the lower plate 31. In this way, the watertightness of the roofing system 1 according to the present invention is achieved.

Figure 3B shows the multi-layer panel 3 of Figure 3A in side view. Preferably, the multilayer panel 3 of Fig. 3A is mounted on a frame 22 (Fig. 12) that is slightly bent at the fictional line mn, such that the multilayer panel 3 has an elevation h near the center mn between the two projecting portions 39a, 39b for forming a slope toward the edges 38a, 38c of the projecting portions 39b, 39a to prevent stagnant rain water on the upper plate 34, to prevent deflection and creep of the girder 21 (in the if there are at least two panels 3), and to prevent a smooth evacuation of infiltrating water 78 in the first and third water channel 61, 63. This increase h is desirable but not necessary. It has been found that an increase h = L7200 is feasible for conventional three-layer glass plates. The elevation (or bending) can be obtained by tightening the third profile 56 by means of the screws 73 (Fig. 9) to the supporting structure 23, which is preferably made of wood, so that the multilayer glass plate 3 is tensioned and slightly convex is shown. For example, if the length L of the glass is 100 cm long, then an increase of substantially 5 mm is preferably used.

However, it is not necessary for the upper glass plate 34 to have two overhanging portions 39a, 39b, Fig. 3C shows an example of a multi-layered glass panel 3 with only one overhanging portion 39 in plan view, and shows a possible position of the first and second seals 41, 42 relative to the lower and upper plates 31, 34 again.

Example with one multi-layer panel:

Figure 2 shows an example of a roofing system according to the present invention, with one multi-layer panel. It comprises a first profile 51 (e.g. an aluminum profile or a metal plate) that is attached to the first seal 41 (e.g. seal rubber), and has an L-shape or U-shape or the like for forming a cavity between the profile 51 and a first side 361 of the multi-layer glass panel 3. This profile 51 preferably extends over the entire length of the panel, and is open at least at one end thereof. In this way, the side 361 of the multi-layer panel is protected against external weather influences (for example, sun, rain, wind in a direction perpendicular to the side 361 of the glass plate 3). Although waterproof, the roofing system as shown in Figure 2 has a problem because no thermal interruption is provided between the first profile 51 and the bottom glass plate 31, whereby the bottom of the bottom plate 31 is in contact with the inside temperature (e.g. 20 ° C), and the side of the lower plate 31 with the environment (e.g. -10 ° C). Under such conditions, condensation can occur in the multilayer plate 3, and possibly even thermal break due to the internal stresses. For many multilayer glass panel manufacturers, it is therefore a criterion that the side of the lower plate 31 is not in direct contact with the outside temperature, but that a thermal interruption is provided, but such that air circulation is also possible in addition to the multilayer glass plate, in order to prevent condensation in the multi-layer panel 3. A solution to this problem is described in Fig. 9, and can be applied without any doubt in the example of Fig. 2, but has not been deliberately drawn in Fig. 2 to illustrate the problem of thermal bridge and condensation.

Figure 2 also shows a second profile 52, for example a folded aluminum plate, which is mounted against the second seal 42, and which is preferably placed at a slight inclination angle β of, for example, 5 °, so that the rainwater can easily drain away In a direction away of the glass plate 3. Below the second profile 52 an insulating layer 53 is provided, for example of wood or plastic, which provides a thermal interruption between the environment (above the second profile 52) and the second side 362 of the glass panel 3, and by mounting the insulating bearing 53 at a distance from this side, air circulation is also permitted in addition to this side. The same principle will be applied in the example of Figures 6-8, and will be further described there in detail.

Example with two multi-layer panels:

Figures 4-12 show a preferred embodiment of a roofing system 1 according to the invention with two multi-layer panels.

Figure 4 shows a perspective view of the roofing system 1, which is mounted on a flat roof 2, wherein the roofing system 1 has two transparent multi-layer panels 3a, 3b. The position of various sections A-A, B-B, C-C and D-D are indicated on it. From the outside, the upper glass plates 34a, 34b are of course visible, but the rest of the structure is hidden. Alternatively, for example, the second profile 52 could be further moved to the edge of the overhanging portion, and become visible, as shown in Figure 6.

The roofing system 1 is typically built over a wooden support structure 23, against which a roofing membrane 76 (for example a water-impermeable foil or "roofing") is typically fitted, to protect the base (support structure 23 and framework 22) of the roofing system 1 against external influences, but other techniques known to those skilled in the art can also be used.

The sides of the glass plates 3 parallel to the X-axis are shielded by first profiles 51 and along the top by third profiles 56, as further described in Figure 9. The space between the two plates 3a, 3b is also screened from above by a third profile 56, shown in more detail in Figure 10. The third profiles 56 are preferably closed at their ends with a plastic head plate for aesthetic reasons.

Figure 5 shows an exploded view with the main components of the roofing system 1 of Figure 4. It is mounted on a support structure 23, usually made of wood, which is mounted on the flat roof 2, in per se known ways. In this support structure 23, a notch 80 is preferably provided, on which a frame 22 (also called "frame" or "frame") can rest. The frame 22, shown in more detail in Figure 12, is preferably formed from metal, for example from steel, and, as described above, preferably has a slight increase at the level of the fictitious line m-n with respect to the rest of the frame. In the middle of the frame 22, below the position between the two glass plates 3a, 3b, a so-called roof beam 21 is attached to the frame on which the glass plates 3a, 3b can rest. This roof beam can for instance be a steel T-profile or a tubular profile, but other profiles are also possible, for example a U-profile. This aspect is explained in more detail in Figure 10. Under the overhanging portions 39 of the upper glass plate 34 of the panels 3a, 3b, "shelves" 53, for example wooden beams, are placed, in which preferably grooves or drainage channels 54 are milled as in detail shown in Figure 11, for draining infiltrated water and condensed water. The bearing 53 is preferably manufactured from a thermally insulating material (for example wood or plastic) for obtaining a thermal break between the environment and the lower plate 31. Thanks to the discharge channels 54, the bearing 53 also ensures the ventilation of the edge seal 35 of the multi-layer glass panel 3, as described above, to prevent condensation. Second profiles 52 are mounted on these insulating layers 53 (or vice versa), and both are preferably placed at an angle β of, for example, 5 ° with respect to the horizontal, for guiding the rainwater flowing over the edges 38c.

Figure 6 shows a cross-section of the roofing system of Figure 4 according to the cut A-A. At the bottom is shown the support structure 23, which can for instance be made of wood, and which is mounted in known ways on the flat roof 2. In order to protect the support structure 23 against external factors (e.g. wind, sun, rain, snow) a usually a roofing membrane 76 is attached on the outside thereof. On the inside, the supporting structure 23 can for instance be finished with a plasterboard 70. A notch 80 is provided in this wooden supporting structure 23, such that the frame 22 can be inserted in its entirety from above and partly into the supporting structure 23, during the placing of the roofing system 1, and can rest on the bottom 81 of this notch 80.

Provided on this support structure 23 is a milling 25 in which a plastic sealant 82 such as, for example, silicone, or glue or a weather-dependent kit can be applied to the roofing membrane 76. This silicone or kit 82 ensures that the air tightness is guaranteed at this location. The insulating layer 53 is preferably placed at an angle β, where 0 <ß <7 ° with respect to the flat roof 2. This angle is at least 1 ° to prevent stagnant water on the second profile 52, and at most 6 ° because otherwise , optionally, there is no longer a virtually horizontal roof covering, and because the watertightness can then be compromised. The second profile 52 is attached to this bearing 53, for example by means of a first screw 523 and a plastic sealing ring 521 to prevent water ingress along the screw hole, without having to use, for example, silicone in the screw hole. The second profile 52 is preferably an extruded aluminum profile, with a profiling that allows easy placement of the second seal 42. It ensures the protection of the insulating layer 53 against the outside conditions, for the hidden drainage of any condensed water 84, and for an invisible drainage of any infiltrating water. This will be further discussed in Figure 7. In the top center of Figure 6, the multi-layer glass panel 3 is shown, with a lower plate 31, a middle plate 32, then an air cavity 33, an upper glass plate 34 and an edge seal of the glass 35. The upper glass plate 34 has a protruding portion 39 (also called "protruding lip") which rests on the second seal 42. The ambient air only contacts the lower glass plate 31 via the outlet channel 54 of the insulating layer 53. This channel serves as an air ventilation channel , but can also drain infiltrated rainwater or condensed water. The black circles show how rain water that falls on the upper plate 34 is drained, first in the direction of the edge 38a, then falls on the second profile 52, and then flows over the edge of the second profile to the flat roof 2. Figure 7 shows this in more detail.

Figure 7 shows an enlargement of a detail in Figure 6. Most aspects of Figure 7 have already been described in Figure 6. The shelf 53 is mounted at a distance from the glass plate 3, for example by making use of a few spacers 55. For this purpose for example, short wooden blocks are used which are placed at the ends of the shelf 53 between the glass plate 3 and the shelf 53. It is not visible in Figure 7, but the location where this block 55 is drawn is substantially the entire length of the shelf 53 open, and through outlet channel 54 in contact with the outside air. In this way the ventilation (air circulation) is provided on this side 362 of the glass plate 3.

Also shown is a preferred embodiment of the mounting of the sealing rubber 42. It preferably consists of a co-extrusion with a soft part 421 and a hard part 422 which has a shape that can be slid into the profile of the second profile 52, which as before is preferably an extruded aluminum profile. The sealing rubber 42 realizes the air tightness and water tightness below the overhanging portion 39. The dotted line 83 represents the ventilation of the edge seal 35 of the glazing 3, and the drops 84 represent the drainage of the condensation water from the glazing. Figure 7 also shows the position of a portion of the third seal, here for example a flexible seal strip 44, below the lower plate 31, near the edge of the lower plate.

Figure 8 shows a cross-section of the roofing system 1 of Figure 4 according to the cut B-B. Figure 8 is very similar to Figures 6 and 7, but there are some differences. Among other things, an optional groove 522 of the second profile 52 is shown, which simplifies the alignment of the screws 523 of Figure 7, which contributes to a faster assembly and a better aesthetic appearance. Figure 8 also shows how infiltrating water and condensed water from the third ventilation channel 63 (between the two panels 3a, 3b) is drained to the drain channel 54 of the shelf 53, also the ventilation channel to the edge seals 35c, 35d of these panels 3a, 3b . More details on this are shown in Figure 10. Note that the drain channel 54 in the shelf 53 ensures an invisible evacuation of infiltrating water.

Figure 9 shows a cross-section of the roofing system 1 of Figure 4 according to the cut C-C. The following elements have already been discussed above: the support structure 23 with the notch 80, the roof sealing membrane 76, the construction of the multi-layer glass panel 3, and the placement of the frame 22.

Furthermore, a lateral profile 51 is shown with a flat segment that is attached to an insulating block 514, for example a wooden beam, which in turn is attached to the support structure 23, and with an upright segment for protecting the insulating block 514, and a third segment below that is pressed against the roofing membrane 76. This pressure is obtained in that the flat segment and the upright segment have an angle α relative to each other, with 80 ° <α <90 °, and by pulling the flat segment (for example by screwing it down) against the insulating block 514. The angle α is preferably greater than 80 ° because otherwise the aesthetic will be disturbed, and is preferably smaller than 90 ° because otherwise the connection with the roofing membrane 76 will be lost. The insulating block (or filling element) 514 provides a thermal break, as described above.

A base profile 58 (preferably made of aluminum) is also fixed to the support structure 23, into which a central profile 57 is slid (in a direction perpendicular to the blade). The central profile 57 is preferably made from a thermal insulator, and also contributes to the thermal interruption. It is not mechanically attached (in the longitudinal direction) to the underlying structure so that differential effects (for example, thermal expansion) between the different materials can be absorbed. Attached to the base profile 58 is also a seal 43 which forms part of the "third seal", in this example consisting of a first soft portion 431 on top on which the lower plate 31 rests, and a second soft portion 432 at the bottom.

Above the insulating block 514 and above the upper plate 34 a sealing profile 45, for example a plastic clamping strip, is mounted, preferably a co-extrusion with a hard plastic part 451 at the top, and a soft plastic part 452 at the bottom in contact with the insulating block 514 (left on the figure) and with the upper glass plate 34 (right on the figure) for clamping thereof. A third profile 56 (for example an aluminum finishing profile) is provided on top of the sealing profile 45 (for example by clicking or sliding). This soft plastic comprises a multiple seal 453 (e.g. from rubber), but other seals can also be used. The sealing profile 45 is fixed in the central profile 57 by means of a screw 73 and a round one! or distributor plate 74 for distributing the pressing force of the screw 73 over a larger plastic surface. The screw 73 is preferably provided with a special head (so-called "safety bit") to increase burglary security. Such a head resembles an opening with five stars with a hole or a pin in the middle, which cannot be unscrewed with conventional screwdrivers. The screw 73 is of such a length that it only penetrates the central profile 57, but does not extend to the bottom thereof. As a result, any condensed water 79 or infiltrating water 78 cannot give rise to a leak. Figure 9 shows that rainwater infiltrating along the screw 73 or along the multiple seal 453 ends up in a hollow space, i.e. the first ventilation channel 61, in which a water channel can be formed at the bottom. This first ventilation channel 61 is open along at least one end, for discharging the infiltrated or condensed water 78, 79, and for allowing ventilation air up to the edge seal 35 of the glass plate 3, to prevent condensation.

Figure 10 shows in detail a watertight connection between the two multi-layer panels 3a, 3b, as used in the roofing system of Figure 4. The third ventilation duct 63 is shown. On the roof girder 21 which forms part of the frame 22 (see Figure 12), a (preferably aluminum) second base profile 59 is placed, very similar to that of figure 9, but the profile of figure 10 has a provision on either side for mounting the seal 43. Here too, the seal 43 preferably comprises a second soft portion 432 at the bottom, and a first soft portion 431 at the top, on which the lower glass plate 31 rests. The attachment of the third profile 56 is done in a similar manner as described in Figure 9.

Figure 10A shows, in a section that may correspond to the section of Figure 8, Figure 9 or Figure 10, an example of the seal 43. Figure 10A shows the seal 43 with a second soft portion 432 at the bottom, and a first soft portion 431 at the top. In use, the lower glass plate 31 rests on the first soft portion 431. The term "deformable" can be used instead of the term "soft".

As can already be seen from figures 8-10, the seal 43 can cover a top side of the first basic profile 58 and / or a top side of the second basic profile 59. Figures 8-10 show that, preferably, the seal 43 covers the first basic profile and / or the second basic profile so that contact of rainwater with the first and / or the second basic profile is substantially prevented. In particular, figures 8-10 show that, preferably, the second soft portion 432 of the seal 43 covers the first base profile and / or the second base profile so that rainwater contact with the first base profile 58 and / or the second base profile 59 respectively substantially prevented. To this end, the seal 43 may be provided with a first wall portion formed, for example, by the first soft portion 431, and a second wall portion 96, formed by, for example, the second soft portion 431. The seal 43 may be provided with a bottom portion 97, the first wall portion extends upwardly from bottom portion 97, and wherein second wall portion 96 extends upwardly from first bottom portion from bottom portion 97. As a result, the seal 43 between the bottom portion and the wall portions can form a channel for draining infiltrated rainwater. The bottom portion 97 and the first wall portion can be formed by the first soft portion and the second wall portion can be formed by the second soft portion, but this is not necessary.

It will thus be clear that it follows, inter alia, from Figure 10 and the associated description that a second base profile 59 covered with the seal 43 can be placed on a bottom of the third ventilation duct 63 between the two multi-layer plates 3a, 3b, for receiving and draining infiltrated rainwater and condensed water from the third ventilation channel 63 via the seal 43, in particular between wall sections of the seal 43. In this way, corrosion of the second basic profile can be prevented. More generally, it will be clear that the third seal preferably forms a channel for draining infiltrated rainwater and condensation water, for example from the third ventilation channel 63. Preferably, the third seal is placed in the third ventilation channel for substantially preventing contact between the second basic profile 59 and the infiltrated rainwater. The seal 43 can thus, in use, not only form a support for one or more multi-layer panels 3, but can also form a channel in which water can be collected and / or through which water can be discharged, preferably outside the structure. As a result of such a seal 43, the first base profile 58 and / or the second base profile 59 over which the third seal can be applied can be left untreated. Such a seal can, after all, reduce the risk of corrosion of the first and / or second basic profile, because a chance of contact of infiltrated water with the first and / or the second basic profile can be reduced.

In one embodiment, the seal 43 is provided with tear-off zones 95 at a transition from the first soft portion to the second soft portion. More generally, the term "tear-off zone" may mean a weakening zone. With the aid of the tear-off zone a, preferably right-angled, placement of the first and the second soft part relative to each other can be facilitated. The first soft portion may, optionally, be torn off from the second soft portion, for example when the first and / or the second soft portion may be missing. Also, as an alternative to tearing off before mounting the panel, after fitting the panel using the tear-off zones, after tearing and / or deformation in one or more of the tearing-off zones, a displacement of the first soft portion relative to the second soft part are allowed. By tearing and / or deforming in the tear-off zones, such a movement can take place without this being strongly at the expense of the coverage of the first basic profile and / or the second basic profile by the second soft part. With such a movement, for example, thermo-mechanical expansion of a panel can be absorbed. Due to the weight of the panel, in use, after tearing off, infiltration of water between the first soft part and the second soft part can be substantially prevented.

The seal 43 may, for example, be formed from an extruded plastic. The seal 43 is, more generally, preferably made in one piece. Preferably at least the bottom part 97 and the first and second wall part are made in one piece.

It will thus be clear that a U-shaped drainage channel can be made entirely of a soft material such as plastic, for example rubber. This allows any water infiltration to a first and / or second basic profile to be avoided. The inventors realized that substantially horizontal placement of the panel 3 could result in a slower drainage of rainwater. This places higher demands on a drainage capacity of the drainage channels. Moreover, due to the almost horizontal placement, a risk of corrosion is increased. With drainage channels integral, i.e. complete, made of a plastic such as rubber, such requirements can be met. Traditional systems, on the other hand, should be regarded as insufficiently reliable for combination with panels placed almost horizontally.

Figure 10B shows, in a section that may correspond to the section of Figure 8, Figure 9 or Figure 10, an example of a first seal 41. The first seal preferably comprises a multiple seal, as shown for example in Figures 8-10 . In use, the first seal may connect, for example, to one of the upper plates 34a, 34b to prevent rainwater infiltration into the third ventilation channel 63. The first seal may be provided with a soft plastic portion 452 at the bottom in contact with one of the upper glass plates for clamping them. The soft plastic can include a multiple seal 453.

As can be seen from Figures 8-10, the multiple seal can have seal elements of various shapes. "Multiple seal" can be understood to mean a seal with multiple seal elements. Alternatively, "Multiple seal" can be a seal with at least two, ie two or more, for example two, three, four, five, six, or more than six, seal elements. understand. Preferably, in use, the sealing elements deform substantially independently of each other. The sealing elements are preferably separated from each other by air ducts 94.

As shown in detail in Figure 10, a first seal element 90 can have a shape that differs from a second seal element and / or from a third seal element. At least one of the sealing elements can therefore have a shape that differs from at least one of the other sealing elements. Due to the different forms, different barriers to rainwater can be erected. This can effectively prevent rainwater penetration. Each sealing element can form a separate water-barrier. The first sealing element can, as shown in Fig. 10B, be a closed sealing element. Such a closed sealing element can be hollow, i.e. it can be provided with an inner space. The second sealing element 91 and / or the third sealing element 92 can be an open sealing element. Such an open sealing element can be solid, i.e. an interior space can be missing. Alternatively, the first sealing element can be an open sealing element and the second and / or third can be a closed sealing element. Thus, at least one of the sealing elements can be a closed sealing element, and at least one of the remaining sealing elements can therefore be an open sealing element.

The closed sealing element preferably forms a first barrier against rainwater. The closed sealing element is therefore preferably in direct contact with ambient air. Thus, the sealing elements are preferably positioned in such a way that rainwater, upon infiltration, must pass through a closed sealing element before it reaches the other sealing elements, although it can also be reversed.

The sealing elements can be provided with at least one deformation zone 93, as is also clear from figures 8-10. The closed sealing element 93 is preferably provided with a plurality of deformation zones 93. A deformation zone is designed to concentrate deformation in the deformation zone when deforming a sealing element, for example caused by clamping against the panel. To this end, a thickness of the sealing element at a deformation zone can be locally reduced. As a result of the deformation zones, the sealing element, and as a result also the sealing itself, can deform in a predetermined manner. A quality of sealing can thus be better controlled.

The sealing elements are optionally connected to each other. The first sealing element 41, provided with at least two sealing elements, preferably at least three sealing elements, can be made in one piece. Alternatively, the sealing elements are provided separately from each other.

Figure 11 shows in detail an example of an insulating layer 53, preferably made of plastic or wood, or plasticized wood, with two drainage channels 54, as can be used in. the roofing system of figure 4.

Figure 12 shows in detail an example of a frame 22, such as can be used in the roofing system 1 of Figure 4. Preferably, it is made of wood, steel or aluminum, but a steel frame is preferred. With a steel frame, the framework 22 and the roof girder 21 are preferably welded together in advance into one rigid structure. The steel is preferably treated by, for example, steel blasting, metallization and powder coating, whether or not in maritime quality, so that the rust problem does not exist. The frame 22 is preferably mounted in the support structure 23 by lowering it from above into corresponding notch 80 until it rests on the bottom 81 of the notch. The edge profiles 12 also ensure that the non-steel parts of the roofing system 1 and the supporting structure 23 remain hidden. An advantage of the structure of this frame is that the profiles do not have to be mitered (i.e. at 45 °), which benefits the cost price. The elevation h can be realized, for example, by coldly bending the roof girder 21 and by cutting or cutting the lateral profiles of the frame 22 into a curved shape.

In an embodiment of a method according to the invention, a transparent multi-layer panel is arranged substantially horizontally on a flat roof 2. The method can for instance be carried out with the aid of a roofing system as described above, or with the aid of another roofing system. Note that a roofing system as described above can be obtained, for example, by carrying out the method in the embodiment described here with reference to the figures, but also with the aid of another method.

The transparent multi-layer panel 3 used in the embodiment of the method is provided with a lower and an upper plate 31, 34 which are connected to each other. The upper plate 34 has an overlapping portion 37 that overlaps the lower plate 31. The upper plate also has an overhanging portion 39 which extends beyond an edge of the lower plate 31 for draining rain water that falls on the upper plate 34. In the embodiment, the method comprises providing the roof covering system 1 for the flat roof, which system comprises the transparent multi-layer panel 3. In the embodiment, the method comprises applying a first seal 41 to an upper side of the upper plate 34 to prevent rainwater from infiltrating to the lower plate 31 via an edge 38b, 38d of the upper plate 34. In the embodiment, the method of applying a second seal 42 to a lower side of the overhanging portion 39 of the upper plate 34 to prevent the rainwater that has flowed over the edge 38a, 38c of the overhanging portion 39 from reaching the bottom plate 31. In one embodiment, the method comprises resting the lower plate 31 near its circumference on a third seal 43, 44 to prevent water from infiltrating below the lower plate 31. The roofing system 1 is preferably watertight in use.

On the basis of the above description, it is clear to those skilled in the art that their placement can take place quickly and easily, without the need for specialized personnel.

The main advantages of the roofing system 1 of the present invention can be mentioned: 1) the cost price savings due to the smaller size of the multi-layer panel 3 (due to the horizontal orientation), the "economic size" (due to the placement on top of the roof), the avoiding miter cuts and connecting them, quick and easy assembly, 2) a high thermal insulation value of the roofing system 1, obtained by providing thermal interruption (ie avoiding thermal bridges), and the use of thermally insulating elements, which insulation value can be further increased by using multi-layered laminated glass and an air cavity, 3) the unique drainage and ventilation system, by using the "overhanging lip" and the ventilation ducts 61-63, 4) By applying the roof covering system according to the invention there is a smaller volume of air to be heated (for example in the veranda 24) compared to the madman and the sloping systems.

Although the present invention has been described with reference to specific preferred embodiments, it will be appreciated that various modifications may be made to these embodiments without departing from the scope of the invention as set forth in the claims. Accordingly, the description and drawings are to be considered in an illustrative sense rather than a restrictive sense.

Claims (32)

A roofing system (1) for a flat roof (2), which system comprises a light-transmitting multi-layer panel (3) with a lower and an upper plate (31, 34) interconnected, the multi-layer panel (3) is arranged substantially horizontally on the flat roof (2), wherein: - the upper plate (34) has an overlapping portion (37) that overlaps the lower plate (31), and has an overhanging portion (39) extending beyond a edge of the lower plate (31) for draining rain water falling on the upper plate (34); - a first seal (41) is provided on an upper side of the upper plate (34) to prevent rain water from infiltrating to the lower plate (31) via an edge (38b, 38d) of the upper plate (34); - a second seal (42) is provided on a bottom side of the overhanging portion (39) of the upper plate (34) to prevent the rainwater from flowing over the edge (38a, 38c) of the overhanging portion (39) , the bottom plate (31) reached; and - the lower plate (31) rests on its third circumference on a third seal (43, 44) to prevent water from infiltrating below the lower plate (31), so that the roof covering system (1) is watertight in use, characterized in that the first seal is provided with a soft plastic comprising a multiple seal, the multiple seal comprising at least two seal elements, wherein at least one of the seal elements has a shape different from at least one of the remaining seal elements. The roofing system according to claim 1, wherein the at least one of the sealing elements is a closed sealing element, and / or the at least one of the remaining sealing elements is an open sealing element. The roofing system according to claim 2, wherein the sealing elements are positioned such that rainwater, upon infiltration, must first pass through the at least one closed sealing element before the rainwater reaches the at least one open sealing element. The roofing system according to any of claims 1-3, wherein the sealing elements are provided with at least one deformation zone. The roofing system according to any of the preceding claims, wherein the first seal is arranged so that, in use, the rainwater can only leave the upper plate via the overhanging portion. The roofing system according to any of the preceding claims, wherein the third seal (43) comprises a first soft portion (431) at the top and a second soft portion (432) at the bottom. The roofing system of claim 6, wherein the lower plate (31) rests near its periphery on the first soft portion of the third seal (43, 44) to prevent water from infiltrating below the lower plate (31). The roofing system according to claim 6 or 7, wherein the third seal is provided with a bottom portion, a first wall portion extending upwardly from the bottom portion, and a second wall portion (96) extending away from the first wall portion from the bottom portion extends upwardly, so that the third seal between the bottom portion and the wall portions forms a channel for draining infiltrated rainwater, the bottom portion and the first wall portion being formed by the first soft portion and the second wall portion being formed by the second soft portion. The roofing system according to any of claims 6-8, wherein the third seal is provided with at least one weakening zone at a transition from the first soft portion to the second soft portion. The roofing system (1) according to any of claims 1-9, further comprising a first resp. second profile (51, 52) cooperating with the first resp. second seal (41, 42) for forming a first resp. second ventilation channel (61, 62) for allowing air circulation in addition to a first resp. second side (361, 362) of the multi-layer panel (3). The roofing system according to claim 10, wherein the first profile (51) has an upright portion disposed at a distance from the first side (361), and the second profile (52) at a distance from the second side (362) is positioned, and has a lying portion mounted against the second seal (42) below the overhanging portion (39) of the upper plate (34). The roofing system (1) according to claim 10 or 11, wherein the second profile (52) is placed at an angle (β) of 1-6 °, preferably substantially 5 °, with respect to the flat roof (2), for promoting drainage of the rainwater located on the second profile (52). The roofing system (1) according to any of claims 10-12, further comprising an insulating block (514) and an insulating bearing (53) respectively attached to the first and the second profile (51, 52) to form a first resp. second thermal break between the environment and the first resp. second side (361, 362) of the multi-layer panel (3). The roofing system (1) according to claim 13, further comprising a first base profile (58) disposed on a bottom of the first ventilation channel (61) between the insulating block (514) and the first side (361) of the multi-layer panel (3) ) for collecting and discharging infiltrated rainwater and condensed water from the first ventilation duct (61). The roofing system of claim 14, wherein the third seal covers the first base profile so that contact of rainwater with the first base profile is substantially prevented. The roofing system (1) according to any of claims 13-15, wherein the insulating layer (53) has at least one drainage channel (54) for collecting and draining infiltrated rainwater and condensed water from the second ventilation channel (62). The roofing system according to claim 16, wherein the ambient air only contacts the bottom plate via the drainage channel (54) of the insulating layer (53). The roofing system according to claim 16 or 17, wherein the shelf (53) is mounted at a distance from the panel (3) so that an opening is provided over substantially the entire length of the shelf (53), which via the drainage channel (54) ) is in contact with the outside air, for providing ventilation on a side of the panel (3). The roofing system (1) according to any one of the preceding claims, wherein the first and the second plate (31, 34) are substantially rectangular. The roofing system (1) according to any of claims 1-19, wherein the upper plate (34) comprises on its two opposite sides (38a, 38c) a first and a second overhanging portion (39b, 39a) for discharging the rain water on either side of the top plate (34). The roofing system (1) according to claim 20, wherein the multi-layer panel (3) has an elevation (h) in a position between the two overhanging sections (39a, 39b) to form a slope to an edge (38a, 38c) ) of the overhanging portions (39b, 39a) for promoting drainage of the rainwater located on the upper plate (34). The roofing system according to claim 21, wherein the slope is obtained by placing the multi-layer panel on a frame or frame with the desired curvature, and tensioning the multi-layer panel against it with the aid of a first profile. The roofing system (1) according to any one of the preceding claims, comprising at least a first and a second light-transmitting multi-layer panel (3a, 3b), placed side by side and spaced apart to form a third ventilation channel (63) between them, wherein - each multi-layer panel (3a, 3b) comprises an upper (34a, 34b) and a lower plate (31a, 31b); - a third profile (56) is placed between and above the upper plates (34a, 34b) with first seals (452) connecting to the upper plates (34a, 34b), to prevent rainwater from infiltrating into the third ventilation duct (63) ); - each lower plate (31a, 31b) rests on third seals (431, 432) to prevent rainwater from infiltrating under the lower plates (31a, 31b); and - a second base profile (59) is placed on a bottom of the third ventilation channel (63) between the two multi-layer plates (3a, 3b) for collecting and discharging infiltrated rainwater and condensed water from the third ventilation channel (63). The roofing system (1) according to claim 23, wherein the third ventilation channel (63) is open along at least one of its ends, for draining infiltrated rainwater and condensed water from the third ventilation channel (63). The roofing system according to any of claims 23-24, wherein the second basic profile has a provision on either side for mounting a third seal (43). The roofing system of claim 25, wherein at least one of the first seals (452) that connects to one of the upper plates (34a, 34b) for preventing rainwater infiltration into the third ventilation channel (63) is provided with a soft plastic portion (452) at the bottom in contact with one of the upper glass plates for clamping thereof, the soft plastic comprising the multiple seal (453). The roofing system (1) according to any one of the preceding claims, wherein the light-transmitting multi-layer panel (3, 3a, 3b) is a multi-layer glass panel. The roofing system (1) according to claim 27, wherein the multi-layer glass panel (3) is a three-layer or four-layer glass panel, with a lower plate (31) in contact with a middle plate (32), and with an upper plate (34) separated at a distance from the middle plate (34) by an air cavity (33) closed by an edge seal (35). The roofing system (1) according to any one of the preceding claims, wherein the roofing system (1) is built on a support structure (23) mounted on top of the flat roof (2). The roofing system of claim 29, wherein profiles of the support structure are straight cut. The roofing system according to any of claims 1-30, wherein the multi-layer panel (3) is arranged substantially horizontally on the flat roof (2). A method of applying a light-transmitting multi-layer panel (3) substantially horizontally to a flat roof (2) with a lower and an upper plate (31, 34) interconnected, the upper plate (34) having an overlapping has a portion (37) that overlaps the lower plate (31), and has an overhanging portion (39) that extends beyond an edge of the lower plate (31) for draining rain water falling on the upper plate (34), wherein the method comprises: - providing a roofing system (1) for the flat roof (2), which system is a system according to any of claims 1-31; - applying a first seal (41) to an upper side of the upper plate (34) to prevent rain water from infiltrating to the lower plate (31) via an edge (38b, 38d) of the upper plate (34); - applying a second seal (42) to a bottom side of the overhanging portion (39) of the upper plate (34) to prevent the rainwater from being over the edge (38a, 38c) of the overhanging portion (39) flowed, the bottom plate (31) reached; and - resting the lower plate (31) near its circumference on a third seal (43, 44) to prevent water from infiltrating under the lower plate (31), so that the roofing system (1) is watertight in use.