Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
  • E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
  • E04D13/14—Junctions of roof sheathings to chimneys or other parts extending above the roof
  • E04D13/147—Junctions of roof sheathings to chimneys or other parts extending above the roof specially adapted for inclined roofs
  • E04D13/1473—Junctions of roof sheathings to chimneys or other parts extending above the roof specially adapted for inclined roofs specially adapted to the cross-section of the parts extending above the roof
  • E04D13/1475—Junctions of roof sheathings to chimneys or other parts extending above the roof specially adapted for inclined roofs specially adapted to the cross-section of the parts extending above the roof wherein the parts extending above the roof have a generally rectangular cross-section

Definitions

• the present invention relates in general to installation of a roof element, such as a roof window, in a sloping roof with a roof covering comprising roofing felt.
• the invention relates to a kit of under flashing corner elements, a front edge flashing kit for flashing a lower part of a roof element, and a method of flashing a lower part of a roof element.
• Roof elements such as roof windows, in sloping roofs are installed in different manners, whereby the roof element is protruding more or less from the surface or plane of the roof. Especially in the so-called “Encastrée” manner the roof element does not protrude as far above the plane of the roof as is normally the case.
• kit of flashing members When flashing a roof element, such as a roof window, in a sloping roof, usually a kit of flashing members is used, said kit comprising an upper flashing member, two side flashing members, and a bottom flashing member, said flashing members, respectively, having a generally L-shaped cross-section with a first leg configured to be arranged against a side of the roof element and a second leg configured to extend parallel to a plane of the roof covering, whereby the second legs of the upper flashing member and the side flashing members are configured to be at least in part positioned beneath the roof covering and the bottom flashing member comprises a second leg, possibly including a flexible skirt, configured to be at least in part positioned above the roof covering to seal between the roof element and the roof covering.
• kit of flashing members is also useable with the present invention.
• the sides of the roof element including the side faces and the lower face of the roof element, and especially the lower face, is positioned mainly below the plane of the roof covering and accordingly the bottom flashing member, also known as “front edge flashing element", must provide for "lifting” water drained by the flashing up to the plane of the roof covering. Since the roof is sloping with a minimum slope of e.g. 20° the drained water will still be flowing downwards while flowing over a "lifting" portion of the bottom flashing member.
• the roof covering i.e. the roofing felt
• should be extended to the lower surface of the roof element and support for, or lack of support for the roofing felt between the lower surface of the roof element and the adjacent edge of the opening in the roof surface is a problem.
• first side edge and the second side edge are parallel.
• the stabilising portions comprise a side leg connecting portion connecting the sloping portion and the side leg. This provides for rigidity of the sloping portion.
• the side leg connecting portion extends in a second plane perpendicular to the first plane.
• the second plane extends parallel to the proximal side edge, and preferably the second plane comprises the proximal side edge.
• the side leg connecting portion extends to a side edge portion of the side leg. This provides for a shape easy to mould thus facilitating production of the under flashing corner element.
• the stabilising portions comprise a cross portion extending from the second side edge in a direction towards the first plane. This provides for rigidity of the sloping portion in an installed position.
• the protruding edge extends parallel to the second plane.
• a plane side portion is extending from the protruding edge in a plane parallel to the second plane.
• the cross portion and the side portion are connected along a corner line extending at an angle to the first plane.
• a corner line extending at an angle to the first plane.
• a second sloping portion is extending between the side leg connecting portion and the side portion.
• the under flashing corner element may be watertight.
• the under flashing corner element may be constituted as a thin shell element whereby all the mentioned portions of the under flashing corner element may be thin planar portions, and the under flashing corner element may be made of a plastics material.
• kit of under flashing corner elements comprising a first under flashing corner element according to the invention and configured to fit at a left side lower corner of a roof element; and a second under flashing corner element according to the invention and configured to fit at a right side lower corner of the roof element.
• kit further comprises a profiled, bridging element configured to overlap at least partially the first sloping portions of the under flashing corner elements and bridge a gap between the two under flashing corner elements in an installed position.
• a profiled, bridging element configured to overlap at least partially the first sloping portions of the under flashing corner elements and bridge a gap between the two under flashing corner elements in an installed position.
• the bridging element comprises at least one of a portion configured to overlap at least partially the bottom legs of the under flashing corner elements and bridge a gap between the two under flashing corner elements in an installed position, and a portion extending the length of the bridging element and configured to abut on the lower face of the roof element. This provides for rigidity of the support for the roofing felt even when the bridging element is a thin shell element.
• a front edge flashing kit for flashing a lower part of a roof element, such as a roof window, in a sloping roof with a roof covering comprising roofing felt, comprising a front edge flashing member or bottom flashing member; side flashing members; and a kit according to the invention.
• the front edge flashing kit further comprising at least one spacer.
• a method of flashing a lower part of a roof element, such as a roof window, in a sloping roof with a roof covering comprising roofing felt, using a front edge flashing kit according to the invention comprising the steps of:
• FIG. 1 illustrate different steps of installation of a roof element, for the example a roof window, in a sloping roof with a covering of roofing felt, and an under flashing corner element according to the present invention, which is used for the installation.
• the roof window is installed in the "Encastreé” manner i.e. in lowered position.
• the roof window comprises a frame 1 which is seen in Fig. 10 and in part in Figs. 4, 5 and 8 .
• the frame 1 comprises two opposite side faces 3 extending generally in a sloping direction 5 of the roof and a lower face 7 extending generally perpendicular to the sloping direction 5.
• the sloping roof comprises roof boards 9 as a substrate for the covering, i.e. the roofing felt.
• the roof boards 9 may e.g. be plywood sheets or wood boards as it is known in the art.
• roofing felt often comes as rolls of sheet and for a complete roof covering the roofing felt often comprises two layers, namely a lower layer of under felt and a top layer of top felt. More layers of felt may be provided and under felt may be dispensed with.
• the present invention is not limited to a certain number of layers of felt.
• an opening with dimensions prescribed for the specific window and the manner of installation is provided in the roof surface, i.e. in the roof boards 9 and possibly in a layer of under felt present on the roof boards, and the window frame 1, possibly together with an insulation frame 10, is installed in the opening.
• the window frame 1 care should be taken that a prescribed space or distance is present between the lower face 7 of the window frame 1 and an adjacent lower edge 11 of the opening. The purpose for this space will be explained below.
• Fig. 4 shows the lower left corner of the window frame 1 positioned in the opening and shows a spacer 13 provided by the artisan installing the window to ensure the distance between the lower face of the frame (and the insulation frame 10) and the adjacent edge 11.
• Fig. 5 illustrates an alternative in which a spacer 13a is provided as a part of a kit of parts for flashing the lower part of the window.
• the spacer 13a is provided from a blank 15 of cardboard, see Fig. 6 , that has been folded as seen in Fig. 7 .
• Figs. 1 to 3 show an under flashing corner element 19 for installation under a flashing element and under roofing felt at lower corners of a roof element, in the present example the roof window and especially the frame 1 thereof.
• corner element In the following the under flashing corner element will shortly be designated "corner element”.
• the corner element 19 comprises a plane, generally L-shaped, first portion 21, which extends in a first plane, and the first portion 21 comprises, due to the L-shape, a side leg 23 and a bottom leg 25.
• the bottom leg 25 has an inner side edge 27 at a concave side 29 of the L-shape.
• the corner element further has a plane, sloping portion 31 which extends from the inner, or first, side edge 27 and slopes downwards from the first plane at an acute angle in a direction of the concave side 29 of the L-shape to a second side edge 33.
• the sloping portion 31 has a proximal side edge 35 extending from the first side edge 27 to the second side edge 33 and a distal side edge 37 extending likewise from the first side edge 27 to the second side edge 33.
• the corner element 19 has one or more stabilising portions extending from the sloping portion 31 towards the first plane.
• first side edge 27 and the second side edge 33 are parallel.
• the stabilising portions comprise a side leg connecting portion 39 connecting the sloping portion 31 and the side leg 23.
• This side leg connecting portion 39 extends in a second plane perpendicular to the first plane. Further, in the embodiment shown the second plane extends parallel to the proximal side edge 35 which is in fact positioned in the second plane. As further seen in Fig. 1 , in the present embodiment, the side leg connecting portion 39 extends to a side edge portion 41 of the side leg 23.
• the stabilising portions also comprise a cross portion 43 extending from the second side edge 33 in a direction towards the first plane.
• the side leg 23 comprises a protruding portion 45 extending on the concave side 29 of the L-shape to a protruding edge 47, which in the present embodiment extends parallel to the second plane, and a plane side portion 49 is extending from the protruding edge 47 in a plane parallel to the second plane.
• the cross portion 43 and the side portion 49 are connected along a corner line 51 extending at an angle to the first plane, which is determined by the actual angles of the cross portion 43 and the side portion 49 relative to the first plane.
• a second sloping portion 53 is extending between the side leg connecting portion 39 and the side portion 49 and further between the protruding portion 45 and the first sloping portion 31, whereby the corner element 19 is watertight within its periphery.
• Fig. 8 shows the corner element 19 and a similar, but mirror inverted corner element 19a installed at respectively the left and the right lower corner of the frame 1.
• the first portion 21 is abutting against the roof surface
• the side portion 49 and the protruding edge 47 are abutting against the side face 3 of the window frame
• the cross portion 43 is abutting against the lower face 7.
• the corner elements 19 and 19a are e.g. fastened by nails, not shown.
• the first and the second slopping portions 31 and 53, the side leg connecting portion 39, the cross portion 43 and part of the side portion 49 are extending into the opening in the roof surface.
• a bridging element 57 has been mounted to fill the gap between on one hand the frame 1 or the insulation frame 10 and the adjacent lower edge 11 of the opening in the roof surface and on the other hand between the sloping portions 31 of the two corner elements 19 and 19a.
• the bridging element 57 is positioned below and overlapping the sloping portions 31 to which the bridging element 57, in the present example, is fixed by means of screws 59.
• the bridging element 57 is in this example a wood board provided by the artisan installing the window.
• the bridging element may be constituted by a profiled, bridging element 57a as shown in Fig. 9 .
• the profiled, bridging element 57a has a profile to match the combined profile of the bottom leg 25, the sloping portion 31 and the cross portion 43 of the corner element 19 (see Fig. 2 ) and a length to overlap in part the corner elements 19 and 19a and be positioned between the respective side leg connecting portions 39 of the two corner elements 19 and 19a.
• the shown bridging element 57a comprise a portion 157 configured to overlap at least partially the bottom legs 25 of the corner elements 19, 19a and bridge the gap between the two corner elements 19, 19a in the installed position, and a portion 257 extending the length of the bridging element 57a and configured to abut on the lower face 7.
• bridging element 57a Being profiled and thus configured to abut against the roof surface the profiled, bridging element 57a, together with the corner elements 19 and 19a, provides support for roofing felt adjacent the lower face 7 of the window frame 1.
• the profiled, bridging element 57a is in the example provided as part of a kit of parts for flashing the lower part of the window.
• a layer of under felt may be mounted and a layer of top felt is applied, e.g. by welding as it is well known in the art, below the window frame 1.
• the top felt is in the example and at the stage of installation shown in Fig. 10 , provided as a sheet 61 extending the length of the roof in the sloping direction 5 and three shorter pieces of sheet 61a extending below the window frame 1.
• a bottom flashing member 63 is mounted in a usual manner.
• strips of under felt is preferably applied along the side faces 3 and above the window frame 1, covering gaps between the frame 1 and the roof surface.
• the bottom flashing member 63 is similar to bottom flashing members used for installing e.g. roof windows in the "Encastreé" manner in sloping roofs with different roof coverings apart from the fact that the bottom flashing member 63 used in the present example does not comprise a flexible skirt, which is not needed since the bottom flashing member need not adapt to a corrugated surface of the roof covering like it is e.g. the case when the roof covering comprises tiles.
• the bottom flashing member 63 comprises a dipping portion 65 that dips into the roof surface in order to adequately flash the lower face 7 of the frame 1.
• the dipping portion acts as a "lifting" portion that lifts water drained from the pane (not shown) of the window to the roof surface, as it is known per se. Due to the slope of the roof the surface of the dipping portion will still have an overall downward tilt to drain water down the roof, as indicated by the tilt shown in Fig. 2 for the corner element 19 whose sloping portion 31 has an angle similar to the dipping portion 65.
• the shape of the corner element 19 including the sloping portion 31 provides space for the dipping portion 65 of the bottom flashing member 63 and the prescribed space between the lower face of the roof element/window and the adjacent lower edge of the opening in the roof surface provides space for the part of the corner element 19 comprising the sloping portion 31 and thus for the dipping portion 65 of the bottom flashing member 63.
• the corner element 19 in its above mentioned watertight embodiment provides for covering parts of the transition between the frame 1 of the roof element/window and the surrounding roof boards 9, that are difficult to adequately cover by means of pieces of roofing felt, and the corner elements together with the bridging element provide a stable support for roofing felt adjacent the lower face 7 of the frame 1.

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• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Roof Covering Using Slabs Or Stiff Sheets (AREA)

Applications Claiming Priority (1)

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• 2019
  • 2019-07-08 EP EP19184954.6A patent/EP3594426B1/en active Active
  • 2019-07-08 PL PL19184954.6T patent/PL3594426T3/pl unknown

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