DK2626482T3

DK2626482T3 - Flashing for corrugated roof

Info

Publication number: DK2626482T3
Application number: DK13154373.8T
Authority: DK
Inventors: Per Poulsen
Original assignee: Sabetoflex Aps
Priority date: 2012-02-08
Filing date: 2013-02-07
Publication date: 2014-12-15
Also published as: GB2499212A; EP2626482A1; PL2626482T3; EP2626482B1; ES2525370T3; GB201202174D0

Description

Field of the Invention [0001] The present invention concerns a flashing for corrugated roofing provided at the transition between the roofing and a protruding building structure, e.g. a chimney, a frame of a skylight, a wall or the like. The invention also concerns a method for establishing such a flashing.

Background of the I nvention [0002] Flashings have been used for centuries in order to render watertight the transition between building structures and the adjacent roofing. Previously, lead in sheet form was widely used, but has been banned for health considerations, and other pliable and deformable materials are now used.

[0003] When applying flashings to corrugated roofing there is the problem of depressions in the flashing close to the building structure. The flashing is adapted to the contour of the wavy roofing, producing crests and troughs similar to those of the roofing. When the flashing is adapted to the straight or non-wavy building structure, there will be a border area where the wavy contour is transformed to another shape, often a flat or straight surface. At the transition, a concave contour like a hollow or depression will be produced where rainwater can be collected. This is undesirable as any crack in the flashing material, possibly produced by mechanical working or even walking on the roof, will cause the water to leak into the building at the transition. Furthermore the presence of water (liquid) will even for so-called non-corroding materials cause deteriation of the material, due to the waters influence, often mixed with corrosive pollutants stemming from the air, such as for example exhaust fumes etc.

Object of the Invention [0004] The object of the invention is to relieve the problems of the prior art and to provide a flashing without hollows or depressions at the transition between a corrugated roof and a non-wavy building structure. It is also the object of the invention to provide a flashing which can withstand mechanical action on its upper and outer surface without yielding or cracking.

Description of the I nvention [0005] The flashing provided at the transition between a roof and a structure according to the invention is peculiar in that the flashing includes a second layer of sheet material which is substantially non-deformable and disposed under the first, plastically deformable material and in use over the roofing or structure, and that the second layer of sheet material in use is attached to the top of the crests of the corrugated roof in a region adjacent to the structure, at least part of the second layer extending across the top of the crests so as to form a substantially plane area on the crests in the region adjacent to the building structure.

[0006] The method for establishing a flashing according to the invention uses an outer layer of plastically deformable watertight sheet material and an inner layer of a substantially non-deformable sheet material, the method including the steps: a) placing and attaching a strip or section of non-deformable sheet material on crests of the corrugated roofing so as to establish a substantially plane area of the inner layer of non-deformable sheet material adjacent to the building structure; b) applying the outer layer plastically deformable watertight sheet material at the transition between the roofing and the building structure so as to cover the strip or section of non-deformable sheet material entirely.

[0007] By providing a piece of a rigid and substantially non-deformable sheet material under the pliable and plastic deformable material conventionally used, it is possible to provide an approximately flat area in a region close to and adjacent to the building structure. Thereby, a hollow or depression is avoided, and water coming from above down a corrugated roof cannot be collected in the region close to the building structure. The second layer of non-deformable material is preferably laid directly on the roofing on the one hand with the deformable first layer directly in contact with the first layer, but embodiments with additional layers are possible within the scope of the invention. Similarly, an additional layer between the second deformable layer and the roofing is possible within the scope of the invention.

[0008] The piece of non-deformable material may simply be a rectangular strip or section, and the transition between the flat region produced by the non-deformable material and the corrugated roof may be covered by the layer of deformable material.

[0009] However, a more smooth transition can be achieved in a preferred embodiment of the flashing provided at the transition between a roof and a structure according to the invention wherein the second layer of sheet material is provided as a section or strip including an adaptable region at a side edge facing away from the building structure, the side edge provided with a plurality of slits extending a length from the side edge into the adaptable region, the dimension and spacing of the slits being such that the adaptable region can fit closely to the crests and troughs of the corrugated roofing. The slits are provided with appropriate spacing so that a series of relatively narrow strips are formed which will have a certain flexibility. The strips thus formed will make the slit region adaptable to the crests and troughs of the adjacent roofing, thereby forming a smooth transition from the corrugated roofing to the flat part of the non-deformable area. The smooth transition formed by the adaptable region of the non-deformable sheet material will form more mechanically rigid base for the deformable top layer of sheet material, increasing the strength and durability of the latter.

[0010] Consequently, in a preferred embodiment of the method according to the invention, the strip or section of the inner layer of non-deformable sheet material prior to application on the roof is provided with a plurality of slits in a region extending a length from a side edge on the section or strip, the dimension and spacing of the slits being such as to provide an adaptable region for closely fitting to the crests and troughs of the corrugated roofing, where the strip or section of non-deformable sheet material is positioned on the roofing such that free side edge bordering the adaptable region faces away from the building structure.

[0011] It is preferred that the attachment of the second layer of sheet material to the crests is provided by bonding, e.g. by glue. Furthermore, it is preferred the second layer of material is made of a synthetic material based on PVC.

Description of the Drawing [0012] Embodiments of the invention are described in more detail with reference to the drawing, in which:

Fig. 1 shows a sectional view of an example of a prior art flashing;

Fig. 2 shows a sectional view of a first embodiment of a flashing provided at the transition between a roof and a structure according to the invention;

Fig. 3 shows a sectional view of a second embodiment of a flashing provided at the transition between a roof and a structure according to the invention;

Fig. 4 shows a plan view of a strip of a non-deformable sheet material used in the second embodiment of the invention; and

Fig. 5 shows the same as Fig. 4, but in perspective view and laid upon a corrugated roofing.

Detailed Description of Example Embodiments [0013] In Fig. 1 showing a prior art flashing on a corrugated roofing 1, a building structure like wall or chimney is designated by the number 2 and a roof batten by the number 3. The layer of flashing material 4 is known per se and has to be watertight, weather-resistant and deformable in a plastic manner so that a sheet of the material can adapt itself to the contour of the roofing 1 when pressed down into the troughs of the roofing 1 and stay permanently deformed. The flashing 4 may be of Perform™, a synthetic sheet material of composite nature, e.g. with a metal wire mesh embedded in the material, but other materials may be applicable.

[0014] It appears from Fig. 1 that the flashing 4 covers the gap between the corrugated roof ing 1 and the structure 2 and that the adaptability of the flashing 4 produces a hollow 5 close to the structure 2. Rain water will be collected here without possibly of draining since the crests 1' of the roofing form barriers at the sides. Any cracks in the material 4 will cause water to leak down into the underlying building construction.

[0015] In a first embodiment of the invention, a relatively rigid strip of non-deformable sheet material 6 is glued to the crests 1' of the roofing 1, thus forming a flat and almost plane basis close to the building structure 2 on the top of the crests 1'. After that, the deformable top layer of deformable sheet material 4 is applied on top of the sheet material 6 while following the contour of the structure 2, the strip of sheet material 6 and the crests 1' and troughs 1" of the roofing 1, respectively. It appears from Fig. 2 that the layer designated 6 now produces a flat region 7 close to the structure 2. Although an internal corner is present at the transition between the roofing 1 and the structure 2, any water is now allowed to flow to the sides and be drained off in the usual way in such roof constructions. Furthermore, the top layer 4 of deformable material can now form an approximately horizontal section between the flat region 7 and the area at the bottom of a trough 1" so that water will not tend to be collected here, but flow away to the region 7 and be drained off to the sides in the way known in the industry.

[0016] In a second embodiment of the invention appearing on Fig. 3, the non-deformable layer of sheet material is provided as a strip 8 which is wider and provided with a plurality of slits 9 transversely to one side edge 10, cf. Fig. 4, thus forming an adaptable region 11 of flexible lamellae even though the material of the strip is a rather rigid sheet material. A plan view of the strip 8 before being applied is seen on Fig. 4 with adaptable region 11 and unbroken region 12. Fig. 5 shows the strip 8 when placed on a corrugated roof made of artificial tiles 1, where it appears that the adaptable region 11 with slits 9 accommodates to the contour of the tiles whereas the continuous region 12 stays flat and almost along a plane between the three crests 1' upon which the strip 8 lies.

[0017] After laying the layer or strip 8 of non-deformable material at the position shown on Fig. 3 and gluing the strip 8 to the crests 1' of the roofing, the upper layer 4 of deformable material is applied in the way known per se as the top layer of the flashing. For the sake of clarity, the edge 13 of the layer 4 is shown ending on the open face of the roofing 1 while in practice this edge 13 will often be sealed or inserted between overlying tiles or roof plates for the sake of tightness. The upper layer 4 is now mechanically supported by the underlying sheet or strip 8 of slit region 11 of non-deformable sheet material, evening the transition between the flat region 7 and the contours of the roof ing 1 and additionally providing strength to the finished flashing.

[0018] The material used for the non-deformable sheet material 6, 8 is preferably a PVC-based roofing material, e.g. of the trademark Sika, or other materials with the same properties.

[0019] The claims cover embodiments other that those described above. Attachment of the strip of non-deformable material can be effected by other means than gluing, e.g. by fasteners of various kinds. Also, other kinds of sheet material for the flashing can be used if only they fulfil the requirements to plastic deforma-bility and rigidity as described above.

Claims

1. Covering for corrugated or corrugated roofing materials (1) located at the junction between the roofing material (1) and a projecting building structure (2), e.g. a chimney, a skylight frame or a wall, wherein the cover comprises a first outer layer (4) of waterproof plastic material which is deformable, characterized in that the cover comprises a second layer (6) of plate material which is substantially non-deformable. and located beneath the first plastic deformable material (4) and positioned above the roofing material, and the second layer (6) of sheet material being attached to the top of the corrugated peaks (1 ') of the corrugated roofing material (1) in an area adjacent up to the structure (2), at least a portion of the second layer extending over the wave peaks (1 '), thereby forming a substantially flat area (7) on the wave peaks (1') in the area adjacent to the building structure (2) .

Covering according to claim 1, wherein the second layer (6) of sheet material is provided as a section or piece (8) comprising an adaptable area (11) at a side edge which, during use, turns away from the building structure, wherein the adaptable area (11) is provided with a plurality of slots (9) extending from the side edge into the adaptable area (11), the size and spacing of the slots (9) being such that the adaptable area (11) can join close to the wave peaks (1 ') and the wave valleys of the corrugated roofing material (1).

Cover according to claim 1 or 2, wherein the attachment of the second layer (6) of sheet material to the wave peaks (1 ') is provided by adhesive, e.g. with glue.

Cover according to any preceding claim, wherein the second layer (6) of the material is made of a synthetic material based on PVC.

Cover according to any one of claims 2 to 4, wherein the outer layer (4) and the second layer (6) are at least partially connected outside the adaptable area (11).

A method of establishing a roofing according to claim 1 on corrugated roof structures provided at the junction between the roofing (1) and a building structure (2), e.g. a chimney, skylight or wall, using an outer layer (4) of deformable waterproof sheet material and an inner layer (6) of a substantially non-deformable sheet material, comprising the steps of: a) placing and securing a piece or section (8) of non-deformable sheet material on the corrugated tops (1 ') of the corrugated roof covering (1) thereby establishing a substantially flat area (7) of the inner layer (6) of non-deformable sheet material up to the building structure (2), b) applying the outer layer (4) to plastic deformable, waterproof sheet material at the transition between the roofing (1) and the building structure (2), thereby completely covering the piece or section of non-deformable material.

The method of claim 6, wherein the piece or section (8) of the inner layer (6) non-deformable material prior to application to the roof is provided with a plurality of slots (9) in a region extending from a side edge of the piece or section where the size and spacing of the slots (9) are such as to provide an adaptable area to close closely to the wave peaks and wave valleys of the corrugated roof covering (1), the piece or strip (8) of not being -deformable sheet material is placed on the roof covering (2) such that the side edge (13) adjacent to the adaptable area faces away from the building structure (2).

The method according to claim 6 or 7, wherein the inner layer of sheet material is attached to the wave peaks (1 ') by adhesive, e.g. with glue.