GB2098641A - Panels for pitched roofs - Google Patents

Abstract

Roofing panels 14 have upper and lower horizontal edges which are return bent through two right angles each symmetrically to and inversely of the other to provide re-entrants 15, 23 to receive the ledge 16, 22 of another member 14. The re-entrant at the lower edge is at the underside of the member 14 and the upper surface of the ledge 16 thereof is co-planar with the upper surface portions of the bar 18 of a support 19 of inverted T-section. The undersurface of the bar of the support then serves for attachment of the member to a purlin 11 of a roof framework. Any water which penetrates the abutting joint between panels in the same horizontal row is directed by a sealing strip 30 into a duct 25 in return bend 15. From there, it rises by capillary action up ledge 16 and onto the outer face of the next lower panel. <IMAGE>

Description

SPECIFlC,ATlON A cover member for pitched roofs This invention relates to a cover member, e.g. tiles or panels for pitched roofs.

It is traditional in covering roofs with tiles or slates to apply trusses to the supporting structure or framework and secure in position over the trusses sarking or the like, then felt or the like over the sarking, then counter battens, and finally tiling battens to which the tiles or slates are secured.

An object of the present invention is to provide roof covering members enabling sarking, roofing felt and battens to be dispensed with and the number of trusses reduced in the construction of a covering for a pitched roof.

In accordance with the present invention, the cover member edges which in use are disposed horizontally are return bent through two right angles each symmetrically to and inversely of the other to provide re-entrants each adapted snugly to receive the ledge of the other, the re-entrant at the member edge which in use of the member is the lower edge being at the underside of the member and the upper surface of the ledge thereof being co-planar with the upper surface portions of the bar of a support of inverted T-section whereof the stem is continuous with the member edge-adjoining portion of the return bend at the member edge which in use of the member is the upper edge, and the undersurface of the bar ofthe support then serving for attachment of the memberto a purline of a roof framework.

Also in accordance with the present invention a roof covering applied directly to a pitched roof framework comprises interfitted cover members arranged in a stepped series and the horizontal edges of which are return bent through two right angles each symmetrically to and inversely of the other to provide re-entrants each adapted snugly to receive the ledge of the other, the re-entrant at the lower edge being at the underside ofthe member and the upper surface of the ledge thereof being co-planar with the upper surface portions ofthe bar of a support of inverted T-section whereof the stem is continuous with the member edge-adjoining portion ofthe return bend at the upper edge, and the undersurface of the bar of the support then serving for attachment ofthe memberto a purlin or truss of the roof framework, the ledges of the return bends at the lower edges of the members save the lowermost in each stepped series extending over part oftheir lengths into the re-entrants at the upper edges of the members therebelow whereby at each member overlap there are two continuous horizontal ducts of rectangular section formed by the unfilled portions of the two re-entrants thereat.

Also in accordance with the present invention, a cover member for use in covering a pitched roof is formed at its edges which in use are disposed hori zontallywith return bends each symmetrical to and inverse of the other to provide a ledge spaced from and parallel to the adjacent major surface of the member and defining between same and said major surface a re-entrant adapted snugly to receive the ledge of the other, the re-entrant at the member edge which in use of the member is the lower edge being at the underside ofthe member and the upper surface of the ledge thereof being co-planar with the upper surface portions of the bar of a support of inverted T-section whereof the stem is continuous with the member edge-adjoining portion ofthe return bend at the edge which in use of the member is the upper edge, and the undersurface of the bar of the support then serving for attachment of the memberto a prulin of a roof framework and being in a plane consistent with the pitch of the rafters relative to the upper surface ofthe purlin.

The cover members may be in the form of panels which are long relative to their widths, the width being the dimension between the edges thereof which in use are the upper and lower edges. For example the panel may have a width of about a m and a length of about 10 m, the thickness being about 1.5cm.

The cover members may be of any material suitable for the purpose, e.g. they may be extrusions of a plastics material, but are preferably extrusions of aluminium, and may be cold rolled from sheet steel.

An embodiment of the invention will now be described, by way of an example, with reference to the accompanying drawings, in which Fig. 1 is a side elevation and Fig. 2 is an axonometric projection on a reduces scale of a portion of a pitched roof.

Referring now to the drawings, the reference 10 denotes a principal rafter of a roof truss of a roof supporting structure or framework, the reference 11 denotes a purlin, the reference 12 denotes a fascia, and the reference 13 denotes a gutter.

Cover elements, in the form of panels 14 arranged in stepped formation are of width (the dimension between the upper and lower edges thereof in use) about 9m, of thickness about 1.5 cm, and of length (the dimension between the end edges thereof) about 10 m. The panels 14 are aluminium extrusions and each is formed at its edges, which in use are disposed horizontally, with return bends each symmetrical to and inverse ofthe other to provide a ledge spaced from and parallel to the adjacent major surface of the panel and defining between same and said major surface a re-entrant adapted snugly to receive the ledge of the other, the return bends including two right angles.The re-entrant 15 at the lower edge of each panel 14 is at the underside of the panel and the upper surface of the ledge 16 thereof is co-planar with the upper surface portions 17A and 17B of the bar 18 of a support or fixing heal 19 of inverted T-section. The stem 20 of the support 19 is continuous with the panel-edge adjoining portion 21 ofthe return bend at the upper edge ofthe panel.

The ledge atthe upper edge ofthe panel 14 is denoted 22 and the return bend at the upper edge of the panel is denoted 23. In use the roof is formed in the traditional manner working from the bottom up to the top. Thus, rows of panel are inter-engagingly laid and the panels of adjacent rows closely abut.

The panels tend to lie at a less steep angle than the rafters, therefore the lower face 18A ofthe bar 18 is angled to accommodate the difference in angular disposition of the rafters and the cover members, the angle being dependent on pitch requirement.

The panels 14 are secured through their supports 19 to the purlin 11, or if purlins are omitted, to the trusses. As is apparent from the drawings, the panels 14 of each stepped series are interlocked by the ledges 16 and 22, respectively at the lower edge of a higher panel 14 and the upper edge of a lower panel 14, extending into the respective re-entrants at the upper edge of the lower panel and the lower edge ofthe upper panel, the ledges 16 and 22 penetrating only part of the way into the respective reentrants and thus defining between them and the respective portions 21 and 23 of the return bends longitudinal ducts 24 and 25 respectively, which are continuous from side to side ofthe panel 14.

Ajointing piece 30, Fig.1 is provided below the end to end abutment of each pair of panels. This piece is a flat strip of e.g. the some material as the panels are of sufficient width to overlap the ends of each panel, e.g. 50cms. The length of the strip is such that the lower end 31 locates in the lower return bend of the panel. Howeverto permit this, it is necessary to cut away a portion ofthe upper limb of the upper return bend of the next lower panel; this can be done on site.

Rainwater will normally run down the outer face of the panels and into gutter 13; however, if any rainwater penetrates between abutting panels, it will run down the jointing piece 30 into the lower return bend 15 of a panel; there, the waterwill rise by capillary action up the ledge 16 and onto and down the outer surface of the next lower panel. The rainwater in the return bend 15 of the lowermost panel will pass, via facia 12 into the gutter 13.

A galvanised bracket 32 is located at the lower end ofthe rafter and has two limbs 33, 34 spaced by a step 35. One limb is screwed to the rafter and the other nests within the lower return bend of the lowermost panel.

The cover member may be in the form of a tile of, for example, the same width and thickness of the panel, but shorter length.

A roof covering formed by a series of cover members as hereinbefore described is advantageous in that the number of trusses is reduced and battens are not required. Consequently, the weight of the roof structure is reduced.

In addition, sarking and roofing felt are also not required with a consequent additional saving in costs and labour.

Claims (7)

1. A cover member having edges which in use are disposed horizontally and which are return bent through two right angles each symmetrically to and inversely of the other to provide re-entrants each adapted snugly to receive the ledge of the other, the re-entrant at the member edge which in use of the member is the lower edge being at the underside of the member and the upper surface of the ledge thereof being co-planar with the upper surface portions of the bar of a support of inverted T-section whereof the stem is continuous with the member edge-adjoining portion ofthe return bend at the member edge which in use of the member is the upper edge, and the undersurface of the bar of the support then serving for attachment ofthe member to a purlin of a roof framework.

2. A roof covering applied directly to a pitched roof framework comprises interfitted cover members arranged in a stepped series and the horizontal edges of which are return bent through two right angles each symmetrically to and inverselyofthe other to provide re-entrants each adapted snugly to receive the ledges of the other, the re-entrant at the lower edge being at the underside of the member and the upper surface of the ledge thereof being co-planar with the upper surface portions of the bar of a support of inverted T-section whereofthe stem is continuous with the member edge-adjoining portion ofthe return bend at the upper edge, and the undersurfaceofthe bar of the support then serving for attachment of the member to a purlin or truss of the roof framework, the ledges of the return bends at the lower edges of the members save the lowermost in each stepped series extending over part of their lengths into the re-entrants at the upper edges of the members therebelow whereby at each member overlap there are two continuous horizontal ducts of rectangular section formed by the unfilled portions of the two re-entrants thereat.

3. A cover member for use in covering a pitched roof is formed at its edges which in use are disposed horizontally with return bends each symmetrically to and inverse of the other to provide a ledge spaced from and parallel to the adjacent major surface of the member and defining between same and said major surface a re-entrant adapting snugly to receive the ledge of the other, the re-entrant at the member edge which in use ofthe member is the lower edge being at the underside ofthe member and the upper surface of the ledge thereof being co-planar with the upper surface portions of the bar of a support of inverted T-section whereof the stem is continuous with the member edge-adjoining portion of the return bend at the edge which in use of the member is in the upper edge, and the undersurface of the bar of the support then serving for attachment of the memberto a purlin of a roof framework and being in a plane consistent with the pitch of-the rafters rela tire to the upper surface ofthe purlin.

4. A cover member as claimed in claim 3 which is in the form of panels which are rong to their wirths, the width being the dimension between the edges thereof which in use are the upper and lower edges.

5. A roof covering as claimed in claim 2 in which a jointing piece is provided below the end to and abutment of horizontally adjacent members, and in which the end portion ofthe upper limb of the upper return bend ofthe next lower cover member is cut away to permit location of the jointing piece.

6. A cover member for pitched roofs substantially as hereinbefore describe with reference to the accompanying drawings.

7. A roof covering on a pitched roof substantially as hereinbefore described with reference to the accompanying drawings.