GB2219325A

GB2219325A - Roofing trims

Info

Publication number: GB2219325A
Application number: GB8912703A
Authority: GB
Inventors: Peter William Cole
Original assignee: B C AS FELT Ltd
Current assignee: B C AS FELT Ltd
Priority date: 1988-06-02
Filing date: 1989-06-02
Publication date: 1989-12-06
Also published as: GB8912703D0; GB8813076D0

Abstract

A roofing trim comprises discrete sections butted together. Each trim has a generally horizontal flange 2 or 8 overlaid with asphalt and a generally vertical flange 3 or 9 and the joint between adjacent sections is covered with a lone, complementally shaped strip 5 or 11 to allow relative movement (e.g. due to expansion) between the trim sections. <IMAGE>

Description

ROOFING TRIMS This invention relates to roofing trims.

Particularly in connection with flat roof constructions overlaid by either felt or asphalt it is frequently required that the felt or asphalt should be folded over the front or side edge of the roof to ensure that the roof is sealed along those edges. Unless the folding over of the felt or asphalt is effected by an expert exercising considerable skill, the folded section lying on the front or side face of the roof can have a most untidy appearance, to the considerable detriment of the appearance of the structure.

In an attempt to simplify procedures and ensure a consistent and tidy appearance, it has already been proposed to provide roof edge trims of a suitable plastics or metal such as an aluminium alloy, of a generally L-shape, one leg of which is laid on and secured to the roof and the other of which overlies the edge of the roof. Whilst this is a simple operation, with a substantially guaranteed visual effect, there is the major problem that the trim must be applied in sections, and the leg secured to the roof is overlaid by felt or asphalt.The inevitable expansion and contraction to which the sections of trim are subjected during changing climactic conditions, and possibly by heat from the interior of the structure, causes an unacceptable level of stress to be introduced into the felt or asphalt that eventually leads to cracks being induced in the felt or asphalt at the junction between adjacent trims. For this reason, the use of edge trims has largely been unacceptable.

The object of the invention is to provide a roof edge trimming means that avoids the disadvantages referred to above.

According to the present invention, a roof edge trimming means comprises a number of discrete lengths of generally L-shaped trim members adapted to be secured in abutting side-by-side relationship along an edge of a roof, and a further r-elatively short, generally L-shaped member adapted to be laid loosely on the L-shaped trim members and bridge the junction between adjacent trims.

Thus, in one form of construction with the trims secured to a roof by one leg, e.g. by nails or screws, and such that the other leg is spaced marginally beyond the edge of a roof and with the other leg of the trim in an upstanding condition, the second L-shaped member is positioned loosely within the trims to bridge the junction between adjacent trims, and felt or asphalt laid on the roof to overlay the secured legs of the trims and butt up to the upstanding legs of the trims. At the junction between two trims, the felt or asphalt overlays and butts up to the legs of the loose Lshaped member.

As a consequence of this, any movement of the trims by expansion or contraction is prevented by the loose L-shaped member from being transmitted to the felt or asphalt, with then the substantial elimination of induced cracking of the felt or asphalt at the vicinity of a junction between adjacent trims.

Whilst an L-shaped trim member itself can provide an acceptable appearance at a roof edge, it is preferred to have a trim member of generally T-shape, to provide, when in position, a downwardly-extending leg to mask the edge of the roof and provide a still more attractive appearance. When a generally T-shaped trim is employed, it is still further preferred to provide a flat blanking plate to lie behind and bridge the junction between two adjacent downward legs of the trim, to further enhance the appearance at the roof edge, by closing (to the eye) any gap that might exist.

In an alternative form of construction trim members of generally L-shape are secured by one leg to a roof with the other leg overlying the roof edge and extending downwardly to an outwardly turned bottom edge. Here, a loose generally Lshaped member is placed on the trims to overlie a junction between two trims, and felt or asphalt laid on the roof to overlie the leg of the trims secured to the roof and the upper leg of the loose member, and folded, to overlie the respective downward legs of the trims and the loose member. In common with the constructions mentioned above, the effect is that any movement of the trims is prevented by the intervening L-shaped member from transmitting stress to the felt or asphalt with again the substantial elimination of induced cracking of the felt or asphalt in the vicinity of the junction between adjacent trims.As to appearance, it is relatively simple to ensure that the felt or asphalt folded over the edge of the trims is brought into contact with the outwardly turned bottom edge of the trims.

To allow trims either of T-section or of L-section as last mentioned above to cooperate with guttering, an angled drip plate can be provided at the bottom edge of the downwardly extending leg to direct. water to guttering secured to the wall of the structure in close proximity to the trims.

Here again, a blanking plate can be provided to locate behind the drip plate and bridge the junction between adjacent drip plates to close (to the eye) any gap that might be present.

Several embodiments of the invention will now be described by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a schematic representation in perspective of a trim member in accordance with the invention; Figure 2 corresponds to Figure 1 but shows an alternative construction of trim member according to the invention; Figure 3 corresponds to Figure 1 but shows yet another embodiment of trim member according to the invention.

In Figure 1 a trim member 1 is of generally L-shape having a longer leg 2 and an upstanding leg 3. Thus a number of such trim members can be laid in abutting side-by-side relationship at the edge of a roof and to be overlaid by asphalt 4 laid on the roof to overly the longer leg 2 of the trims and to butt up to the upstanding leg 3. Preferably, and for neatness of appearance, an angled extension 5 can be provided extending from the top edge of the upstanding leg 3, to overly the asphalt at the edge of the roof.

Prior to the laying of the asphalt 4, a further Lshaped member 5 of relatively short length in comparison with the length of the trims, is laid loose on the trims to overlap the junction between two adjacent trims. Thus at the vicinity of a joint between two trims, the asphalt 4 overlies and adheres to the further L-shaped member 5, rather than to the trims themselves. Consequently, during the inevitable changes in climactic conditions the unavoidable expansion and contraction to which the trims are subjected causes a relative sliding of the trims in the vicinity of the joints in relation to the loose further L-shaped member 5 thereby avoiding the transmission of any force to the asphalt consequent upon such movement, the direct effect of which is to avoid the propagation of any cracks in the asphalt in the vicinity of a joint between adjacent trim members.

To further enhance the visual appearance of trims of the invention, the generally L-shaped trim can be provided with a downwardly extending leg 6 to mask the top front edge of the roofline, as is shown in Figure 2 and when a further loose flat plate 7 can be provided to bridge the front joint between the depending legs 6 of adjacent trims to mask any gap that may exist as between the depending legs of the adjacent trims.

In certain circumstances, it is required that asphalt should be folded over the front exposed edge of the roofline, as is depicted in Figure 3. In this instance, the generally L-shaped trim members have one leg 8 to be laid on and secured to the roof and a dependant leg 9 having an out-turned end section 18 to receive the end of the asphalt. In this embodiment a loose L-sectioned plate 11 of a relatively short length in comparison with that of the trims and of a particular cross-sectional shape to match that of the trims, is laid on the trims to bridge the joint between adjacent trims.Thus here again, with asphalt laid on the roof to overlap the trims, the asphalt in the vicinity of a joint overlies and adheres to the loose L-shaped member 11 rather than to the trims themselves, and when again any expansion or contraction of the trims results in a relative sliding between the trims and the loose plate 11 thereby avoiding the application of force to the asphalt and the elimination of the propagation of cracks in the vicinity of joints between adjacent trims. As is further exemplified in Figure 3, an integral drip plate can be provided formed by an extension 12 integral with the out-turned section 113 of the L-shaped trim.

Here again, and to enhance the visual appearance of the trim members in the vicinity of a joint, a loose plate 13 can be provided bridging the joint between adjacent extensions 12 to mask any gap that might exist at that point.

Claims

1. A roof edge trimming means comprising a number of discrete lengths of generally L-shaped trim members adapted to be secured in abutting side-by-side relationship along an edge of a roof, and a further relatively short, generally L-shaped member adapted to be laid loosely on the L-shaped trim members and bridge the junction between adjacent trims.

2. A roof edge trimming means as in Claim 1, wherein the L-shaped trim member is provided with a further leg member to create a generally T-shaped trim member.

3. A roof edge trimming means as in Claim 2, wherein a flat blanking plate is provided to lie behind and bridge the junction between adjacent further leg members to mask any gap existing between adjacent further leg members.

4. Aloof edge trimming means as in Claim 1, wherein, in use, one leg of said L-shaped trim member is downwardly dependent from the other leg of the member, whereby to mask the front edge of a roof to which the trim members are secured.

5. A roof edge trimming means as in Claim 4, wherein the bottom edge of the downwardly dependent leg of the Lshaped trim member is outwardly turned to provide an abutment for asphalt laid on the trim members and folded over the edge of the trim members.

6. A roof edge trimming means as in Claim 4 or Claim 5, wherein a flat blanking plate is provided behind the downwardly dependent legs of adjacent trim members.

7. A roof edge trimming means as in any of Claims 1 to 6, wherein an angled drip plate is provided on the trim members to cooperate with guttering secured to a structure in close proximity to the trim members.

8. A roof edge trimming means, substantially as hereinbefore described with reference to Figure 1, Figure 2, or Figure 3 of the accompanying drawings.