GB2337771A

GB2337771A - Roof flashing member

Info

Publication number: GB2337771A
Application number: GB9810112A
Authority: GB
Inventors: Paul Anthony Malcolm Jefferson
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-05-13
Filing date: 1998-05-13
Publication date: 1999-12-01
Also published as: GB9810112D0

Abstract

A preformed roof flashing member (16 or 34) for use at the junction of a tiled roof (12) and an upstanding wall (11,31), comprising a first portion (17,33) for lying against a roof tile (12) and a second portion (18,34) which is upstanding therefrom. The first portion (17,33) is contoured to follow the contours of the roof tile (12); the second portion is fixed to the wall. The member (16 or 34) may be extruded or moulded from a plastics material.

Description

2337771 A ROOF FLASH MIEMIBER The present invention relates to roof flash

members.

Roof flash members are traditionally formed from lead and are used in the sealing of the junctions between the edges of a roof and upstanding sections of wall. These roof flash members are normally cut and moulded in situ from a sheet of lead which is often supplied in a roll. This is a very time consuming and labour intensive exercise. In addition, lead is expensive, heavy to use and is difficult to cut and trim. Furthermore lead leaves obnoxious handling residues and is potentially very harmful.

Roof flash members fall mainly into two categories. The first type are often known- as soakers and extend down the side edge of a section of roof where the roof abuts an upstanding wall. This type of flashing has a portion which lies generally against the wall and a portion which overlies part of an adjacent tile, the uppermost part of the overlying portion being overlapped by the next tile up the roof. Thus a section of lead has to be cut to the length of each tile and then each section of lead has to be moulded about the wall and the tile contours. The portions of the lead soakers lying against the wall are anchored with respect to the wall by a layer of render applied over the topmost edges to form a seal against water penetrating between the flashing and the wall.

The second type of roof flash member is often known as a flashing and is similar to the first type, but extends along the top edge of a roof where it abuts an upstanding wall. The flashing has a portion which is angled down the roof and which is moulded into configuration with the tile contours. A flashing tends to be of a width to cover a number of tiles as there is no requirement for the flashing to be overlapped except at its side edges where it may overlap with an adjacent flashing. Again, the upstanding portion of the flashing is anchored to the wall by a render applied over the topmost edge to provide a seal.

According to the present invention there is provided a preformed roof flash member for use at the junction of a tiled roof and an upstanding wall, the flash member comprising a first portion for lying against a roof tile, said first portion being contoured so as to lie snugly against the contours of the roof tile, and a second portion which is upstanding from the first portion and which, in use, lies against and is anchored with respect to the wall.

With certain "soaker" embodiments the general plane of the first portion is perpendicular to the second portion. In some embodiments the flash member has a length substantially equal to the length of a tile with which it is to be used.

The flash member may have a substantially constant cross-section along its length. In other arrangements there is a third portion at one lengthwise end in the form of an upstanding end wall which is sealingly connected in the angle between the first and second portions. Ideally this end wall is perpendicular to the second portion and is obtusely angled relative to the first portion.

With other Mashing" embodiments the general plane of the first portion is obtusely angled relative to the second portion. The first portion normally has undulations along its length, the undulations corresponding to the undulations across the width of the roof. Preferably the length of the first portion is greater than the width of one tile and may be of a length equal to at least perhaps five tiles.

The flash member is ideally moulded from a plastics material such as a polythene, although extrusion will be possible for certain embodiments of constant cross-section. Another preferred material for construction is GRP or Glass Reinforced Plastic.

Several embodiments of the invention will now be described in more detail. The description makes reference to the accompanying drawings in which:

Figure 1 is a perspective view of one embodiment of flash member according to the present invention in use, Figure 2 is a front view of the flash member shown in figure 1, looking along the general plane of a first portion, Figure 3 is a vertical section through the arrangement shown in figure 1, Figure 4 is a perspective view of another embodiment of flash member according to the present invention in use, Figure 5 is a section through the arrangement shown in figure 4, Figure 6 is a partial, rear perspective view in larger scale of one of the flash members shown in figures 4 and 5, and Figure 7 is a perspective view of a further embodiment of flash member according to the present invention.

Figures 1 to 3 show an embodiment of the present invention in use along the top edge of a tiled roof 10 where the roof abuts an upstanding wall 11. The roof 10 comprises the usual overlapping army of roof tiles 12 mounted on a laterally extending batten 13 which is fixed to a series of spaced rafters 14 which are angled downwardly according to the pitch of the roof 10. A layer of roofing felt 15 is also provided and this extends a short way up the wall 11.

A flash member 16 is provided which spans the junction between the wall 11 and the roof 10, overlying the tiles 12 and the roofing felt 15. The flash member 16 is formed, by moulding for example, from a rigid, durable, waterproof material such as a plastics material. Polythene is one suitable material and GRP (Glass Reinforced Plastic) is another.

The flash member 16 is preferably formed in lengths so as to span a number of tiles in the lateral direction, perhaps five or more. Normally the flash member 16 would be coloured grey so as to resemble traditional lead flashing.

The flash member essentially has two portions 17, 18. The first portion 17 is angled relative to the second portion 18 according in general accordance with the pitch of the roof 10. The second portion 18 is generally flat and is intended to lie against the wall 11 whilst the first portion 17 has undulations 19 which are formed so as to cooperate with the contours of the tiled roof 10 and which extend partway down the uppermost row of tiles 12 on the roof 10. The first portion 17 therefore, in use, lies snugly against the tiled roof, following its contours as would a traditional lead flashing.

The second portion 18 of the flash member 16 is then anchored and sealed with respect to the wall and this may be done in a number of ways. In the arrangement shown an angled stop bead 20, which extends the lateral length of the roof is attached to the top of the second portion 18. A cement render 21 is applied to the wall 11 so as to cover the exposed top of the second portion 18 and the stop bead 20 down to its lowermost end 22. This render 21 prevents water from passing between the wall 11 and the second portion 18 of the flash member. Any water on the undulating first portion 17 will simply flow under gravity down the roof 10.

In figures 4 to 6 there is shown an embodiment of the invention for use along the side edge of a roof 30 where it abuts an upstanding wall 31. Certain features will be the same as described above in connection with figures 1 to 3 and so will be given the same reference numerals. In the roof 30, the lower portion of one tile 12 overlaps the top portion of the tile 12 immediately below as is conventional in roof construction. Similarly, laterally adjacent tiles 12 overlap and interlock at their edges by virtue of lengthwise formations 35 provided at their edges. As discussed above, the tiles 12 are mounted on laterally extending battens 13 and present an undulating external surface.

A flash member 32 is provided for each tile 12 along the side edge of the roof 30. Each flash member 32 has first and second portions 33, 34, the first portion 33 having lengthwise extending contours for cooperation with the lengthwise undulations of the part of the tile 12 adjacent the wall 31. The second portion 34 is upstanding from the first portion, being generally perpendicular to its general plane. In use, the second portion 34 constitutes a side wall which lies against the wall 31 when the first portion 33 of the flash member 32 is correctly positioned on the tile.

Each flash member 32 is substantially the same length as each tile 12 so that each tile/flash member combination overlaps the top portion of the tile/flash member combination immediately below it. When all are in position the flash members 32 are anchored and sealed with respect to the wall 31 and this may be done in a number of ways. The illustrated embodiment has a stop bead 20 and render 21 combination as described above in connection with the arrangement shown in figures 1 to 3. This prevents water from passing between the wall 31 and the flash members 32.

The flash members 32 can be formed by moulding from the same materials as the flash members 16 although their constant cross section along their length means that they are well adapted to formation by extrusion. The flash members 32 could be supplied in long lengths for cutting to size later or they could be supplied ready cut to the size of standard tiles. Different standard tile shapes will of course result in the need for flash members 16, 32 having a variety of configurations in the contours of the first portions 17, 33. Also, certain standard tiles will enable the flash member 32 to be turned around in order to be used on the opposite lateral edge of the roof 30. Some standard tiles will not however allow this and so separate left- and right-sided flash members 32 will have to be supplied.

Figure 7 shows a finther flash member 40 which is used where a roof abuts a side wall 31 and a top wall 11. In the uppermost lateral corners, the flash member 40 is used. The flash member 40 comprises a flash member 32 having its first and second portions 33, 34 and also has third portion 41 connecting the first and second portions 33, 34. The third portion 41 is generally flat so as to overlap the free end of the second portion 18 of a flash member 16 and is angled relative to the second portion 34 according to the pitch of the roof. The broken line indicates the similar flash member for the opposite lateral side of the roof and the hatching shows the parts removed for this opposite flash member.

The above described embodiments simply illustrate the invention and show that the disadvantages of traditional lead usage can be overcome to a large extent although it will be appreciated that there are certain situations where it may not be beneficial to use the present invention.

Claims

Claims

1. A preformed roof flash member for use at the junction of a tiled roof and an upstanding wall, the flash member comprising a first portion for lying against a roof tile, said fast portion being contoured so as to lie snugly against the contours of the roof tile, and a second portion which is upstanding from the first portion and which, in use, lies against and is anchored with respect to the wall.

2.

A preformed roof flash member as claimed in claim 1 wherein the general plane of the first portion is perpendicular to the second portion.

A preformed roof flash member as claimed in claim 1 or claim 2 having a length substantially equal to the length of a tile with which it is to be used. 1 4. A preformed roof flash member as claimed in any one of claims 1 to 3 having a substantially constant cross-section along its length.

A preformed roof flash member as claimed in any one of claims 1 to 3 having a third portion at one lengthwise end in the form of an upstanding end wall which is sealingly connected in the angle between the first and second portions.

6. A preformed roof flash member as claimed in claim 5 wherein said end wall is perpendicular to the second portion and is obtusely angled relative to the first portion.

7. A preformed roof flash member as claimed in claim 1 wherein the general plane of the first portion is obtusely angled relative to the second portion.

8. A preformed roof flash member as claimed in claim 7 wherein the first portion has undulations along its length, the undulations corresponding to the undulations across the width of the roof.

9. A preformed roof flash member as claimed in claim 7 or 8 wherein the length of the first portion is greater than the width of one tile and may be of a length substantially equal to at least five tiles.

10. A preformed roof flash member as claimed in any one of claims 1 to 9 wherein said flash member is moulded from a plastics material such as a polythene.

A preformed roof flash member as claimed in claim 4 wherein said flash member is formed by extrusion from a plastics material such as polythene.

12. A preformed roof flash member as claimed in any one of claims 1 to 11 wherein said flash member is constructed from GR.P or Glass Reinforced Plastic.

13. A preformed roof flash member substantially as hereinbefore described and with reference to the accompanying figures.