GB2197359A

GB2197359A - Roof flashing

Info

Publication number: GB2197359A
Application number: GB08627044A
Authority: GB
Inventors: Raymond William Bunting
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-11-12
Filing date: 1986-11-12
Publication date: 1988-05-18
Anticipated expiration: 2006-11-12
Also published as: GB2197359B; GB8627044D0

Abstract

Roof flashing for use along the junction between the roof tiles of two adjacent attached properties when the roof of one of the properties is to be tiled using tiles which are incompatible with those of the other property, comprises a strip 1 of waterproof material, such as PVC, having upturned, and preferably also inwardly turned, longitudinally extending side edges 8 and 9, and a central upstanding portion 2 spaced inwardly from each side edge by flat web portions 3 and 4. The rib 2 extends along the entire length of the strip, although end strips will also be provided in which the rib terminates short of one end. The underside of the strip 1 has a central recess 10 corresponding to the upstanding rib to allow adjacent strips to be overlapped. In use the end tiles of the existing roof are laid over the strip on one side of the upstanding rib 2, and the end tiles of the new roof are laid over the strip on the other side of the rib 2. <IMAGE>

Description

SPECIFICATION Roof flashing This invention relates to the sealing of the junction between the roof tiles of two adjacent attached properties when the roof of one of the properties is to be tiled using tiles of a different size, shape, or type from those of the other property and the roofs are not separated by a parapet wall.

For example, it is now common, for reasons of cost, to use pantiles when retiling roofs previously tiled with plain tiles or slates. In this case, and in any other case where the new tiles cannot be laid successfully in continuation from the tiles of the existing roof of the adjoining semit-detached or terraced property, it is necessary to seal the junction between the new roof tiles and the existing roof tiles in order to prevent leakage of water into the roof space during wet weather. The conventional way of doing this is to lay a row of ridge tiles on a bed of cement along the junction between the two roofs.However, this method is disadvantageous in that the ridge cannot be laid until the new roof has been laid, so that there is a risk of leakage into the roof spaces of both properties should bad weather occur before the ridge can be laid, and in that the ridge cannot be laid in wet or freezing weather conditions. In addition, laying the ridge is a relatively time consuming process and involves the risk of possible damage to the newly laid roof as a result of the roofer having to clamber over the roof.

With the aim of providing a simpler, quicker, and more efficient means for sealing the junction between the roof tiles of two adjacent attached properties when the roof of one of the properties is to be tiled using tiles of a different size, shape, or type from those of the other property, according to the invention there is provided roof flashing for use along the dividing line between the two roofs, the flashing comprising a strip of waterproof material having upturned longitudinally extending side edges, and an upstanding portion spaced inwardly from each side edge and extending along at least part of the length of the strip.

In use, the flashing in accordance with the invention is fitted as soon as the old roof tiles have been removed and the new feit and battens have been secured. The near end tiles of the adjacent roof are then removed, and a number of the flashing strips are iocated in overlapping manner along and bridging length of the dividing line between the two roofs, with the upstanding portions and the upturned side edges facing upwards. Each strip has its upper end secured by nails, staples, or any other suitable fixing means, and overlapped by the lower end of the next strip up, except in the case of the uppermost strip which will have its upper end secured under the ridge of the roof or, if it meets a chimney stack, under the apron of the conventional flashing at the base of the stack.The end tiles of the adjacent roof are then replaced on top of the strips on the adjacent side of the upstanding portions, whereupon the adjacent roof is rendered watertight. The tiles of the new roof are then laid with the end tiles adjacent the junction lying over the portions of the strips on the adjacent side of the upstanding portions. If desired the end tiles of the two roofs can be butted up against the upstanding portions of the flashing strips, which will thus form a relatively neat and inconspicuous partition between the tiles of the two roofs compared with the conventional ridge formation.

Once the flashing is installed, any water which runs down between the upstanding portion and the edges of the tiles on each side thereof is channelled by the strip portions on each side of the upstanding portion so that the water runs down towards the lower end of the flashing where it is discharged into the gutter, the water being prevented from leaking laterally off the strips into the roof by the upturned side edges of the strips located beneath the end tiles. To improve this water barrier, each of the upturned side edges of a flashing strip in accordance with the invention is preferably also turned inwardly to form an inwardly facing channel along the entire length of the strip. Furthermore, each upwardly and inwardly turned side edge may be further directed down, preferably at an inclined angle, towards the upper face of the strip, while remaining spaced therefrom.

Generally the strips in accordance with the invention will be provided in one or more fixed lengths, and can be cut to size as required. There would usually be two different types, namely a standard type, and an upper end type designed to overlap a standard strip at its lower end and to fit under a ridge or chimney flashing at its upper end as mentioned earlier.

In the case of the standard type, the upstanding portion of the strip preferably extends along the entire length of the strip, and the underside of the strip has a recessed portion corresponding to the upstanding portion, at least at one end of the strip, so that the end can be lapped over the end of an adjacent strip. Preferably the recessed portion in the underside of the strip extends along the entire length of the strip, in which case the strip may have a substantially uniform crosssection along its entire length.

In the case of upper the end type, the upstanding portion preferably extends from one end (i. e. the lower end) of the strip to a position which is short of the other end and at which the end of the upstanding portion is closed, and the underside of the strip has a recessed portion corresponding to the upstanding portion along the length thereof.

The upstanding portion is preferably positioned substantially mid-way between the side edges of the strip, and may have side walls which project substantially perpendicularly from the portions of the strip adjacent thereto.

Preferably the side walls of the upstanding portion are slightly convergent towards the top of the upstanding portion so as to facilitate the overlapping of adjacent strips.

The top of the upstanding portion will usually be flat or convexly curved, but may be provided with other shaped profiles depending on the external visual appearance which it is desired to present when the flashing has been installed and the roof retiled.

The strip may be made from any suitable watertight material which will provide the strip with some degree of flexibility. For example, the strip may be made from aluminium, but preferably it is made from a durable, flexible, plastics material, such as polyvinyl chloride.

Depending on the material, the strip may be extruded, moulded, pressed, or otherwise deformed to the required shape.

A particular example of roof flashing in accordance with the invention will now be described with reference to the accompanying diagrammatic drawings, in which: Figure 1 is a perspective view of the flashing strip in its standard form; Figure 2 is a cross-sectional view of the strip shown in Figure 1 taken in a plane perpendicular to the longitudial axis of the strip; Figure 3 is a perspective view of an upper end strip designed for use with the standard form of strip shown in Figure 1; and Figure 4 is a view similar to that of Figure 2 but illustrating the flashing strip when installed at the junction between two adjacent roofs.

The standard flashing strip 1 illustrated in Figures 1 and 2 is made of weather resistant, flexible, polyvinyl chloride, and has a crosssectional shape (Fig.2) which is uniform along its entire length. The strip 1 has a central upstanding rib 2 extending along its length and separating a pair of flat web portions 3 and 4 lying in a common plane one on each side of the rib 2. The opposite side walls 5 and 6 of the rib 2 project almost perpendicularly from the web portions 3 and 4 respectively, converging very slightly towards the top 7 of the rib 2 which is convexly curved as shown in Figure 2.

Along the outer edges of the webs 3 and 4 the lontitudinally extending side edges 8 and 9 of the strip 1 are turned upwards, inwards, and downwards at an angle towards the upper surfaces of the webs 3 and 4 respectively as shown, the free edges nevertheless remaining spaced above the webs 3 and 4.

The underside of the strip 1 is flat apart from a central longitudinally extending recess 10 formed by the obverse side of the rib 2.

In the example illustrated the strip 1 is 2150 mm long, providing a nominal length of 2 metres and allowing for an overlap of 150 mm by another strip, and the width of the strip is 220 mm. The upstanding rib 2 has a height of 50 mm and a width of 20 mm, and each side edge 8,9 of the strip projects upwards for a height of 5 mm and inwards for a distance of 20 mm. The thickness of the strip is from 3 to 4 mm. These dimensions can of course be varied if desired.

The end strip 11 shown in Figure 3 is identical in construction to the standard strip 1 of Figure 1 except that its total length is 300 mm and the central upstanding rib 12 extends from one end to a position which is only halfway along the strip and at which the end 13 of the rib 12 is closed. Beyond the rib 12 the flat web portions 3 and 4 of the strip merge to form a continuous flat portion 14 across the strip between the upwardly and inwardly turned side edges 8 and 9.

The use and operation of the flashing strips 1 and 11 is as described earlier, the upper end of each strip 1 being overlapped by the lower end of a similar strip 1 or an end strip 11 such that the upstanding rib of the lower strip fits into the recess 10 of the upper strip, and the side edges of the upper strip are fitted under the upwardly and inwardly turned side edges 8 and 9 of the lower strip.

Figure 4 illustrates the positioning of the flashing at the junction between two roofs, the strip spanning the junction between the battens 15 of the existing roof and the battens 16 of the new roof, and the tiles 17 and 1 8 of the existing and new roofs respectively overlying the strip on opposite sides of the upstanding rib 2. In the example illustrated the tiles 17 of the existing roof are plain tiles and the tiles 18 of the new roof are pantiles, and in both cases the tiles are laid as close as possible to the adjacent side wall 6,5 of the rib 2.

As will be appreciated the flashing in accordance with the invention, particularly when made of strong, longlasting, flexible PVC, is quick and easy to fit, being made in relatively long lengths which can be cut and fixed easily as required, is completely water-tight, can be fixed in any weather conditions, and is also cheaper than forming a conventional ridge junction.

Claims

1. Roof flashing for use along the junction between the roof tiles of two adjacent attached properties when the roof of one of the properties is to be tiled using tiles of a different size, shape, or type from those of the other property, the flashing comprising a strip of waterproof material having upturned longitudinally extending side edges, and an upstanding portion spaced inwardly from each side edge and extending along at least part of the length of the strip.

2. Roof flashing according to claim 1, in which each of the upturned side edges is also turned inwardly to form an inwardly facing channel along the entire length of the strip.

3. Roof flashing according to claim 2, in which each upwardly and inwardly turned side edge is directed down towards the upper face of the strip, but remains spaced therefrom.

4. Roof flashing according to any one of the preceding claims, in which the upstanding portion extends along the entire length of the strip, and the underside of the strip has a recessed portion corresponding to the upstanding portion, at least at one end of the strip, so that the end can be lapped over the end of an adjacent strip.

5. Roof flashing according to claim 4, in which the recessed portion in the underside of the strip extends along the entire length of the strip.

6. Roof flashing according to claim 5, in which the strip has a substantially uniform cross section along its entire length.

7. Roof flashing according to any one of claims 1 to 3, in which the upstanding portion extends from one end of the strip to a position which is short of the other end and at which the end of the upstanding portion is closed, and the underside of the strip has a recessed portion corresponding to the upstanding portion along the length thereof.

8. Roof flashing according to any one of the preceding claims, in which the upstanding portion is positioned substantially mid-way between the side edges of the strip.

9. Roof flashing according to any one of the preceding claims, in which the upstanding portion has side walls which project substantially per pendicularly from the portions of the strip adjacent thereto.

10. Roof flashing according to any one of the preceding claims, in which the upstanding portion has side walls which are slightly convergent towards the top of the upstanding portion.

11. Roof flashing according to any one of the preceding claims, in which the top of the upstanding portion is flat or convexly curved.

12. Roof flashing according to any one of the preceding claims, in which the strip is made from a durable, flexible, plastics material.

13. Roof flashing according to claim 1, substantially as described with reference to the accompanying drawings.

14. A method of retiling the roof of one of two adjacent attached properties, in which roof flashing according to claim 1 is iocated along the dividing line between the roofs of the two properties with the upstanding portion and upturned side edges of the strip facing upwards, the end tiles of the roof not being retiled are laid over the strip on one side of the upstanding portion, and the end tiles of the roof being retiled are laid over the strip on the other side of the upstanding portion.

15. A method according to claim 14 in which the end tiles of each roof are laid against the upstanding portion of the strip.