GB2062721A

GB2062721A - Roof Cladding

Info

Publication number: GB2062721A
Application number: GB8031548A
Authority: GB
Original assignee: CONDOR INT Ltd
Current assignee: CONDOR INT Ltd
Priority date: 1979-10-01
Filing date: 1980-09-30
Publication date: 1981-05-28
Also published as: GB2062721B

Abstract

A roof cladding comprising an outer cladding 7, an insulation layer 6 and an inner waterproof lining 2 is supported on purlins 1. The outer cladding is fixed to elongate support members 5 e.g. by bolts 8, the members 5 are mounted on spacers 4 and retained by e.g. screws passing through the spacer and the lining into the purlin so that a clear drainage space is left between the lining and the insulation. <IMAGE>

Description

SPECIFICATION Roof Cladding The present invention provides roof claddings as set forth in Claims 1 and 12, buildings as set forth in Claims 10 and 13 and methods as set forth in Claims 11 and 14.

As disclosed in Patent Application No.

25234/78, the lining acts as a tray-to allow any moisture that is condensed within the cavity between the liner and the outer cladding to drain to the eaves. The spaced out individual supports leave gaps for such drainage, and the water can run down below for instance a fibre-glass insulation in the cavity, provided the insulation isnot compressed. The lining can be made for instance in a cheap material such as galvanized steel and can be thin and can be made by a single operation pressing or rolling, thus being inexpensive and comparable in price to for instance plaster-board.The individual supports form a constant height gap between the lining and the outer cladding support members and also between the lining and the outer cladding, and thus enable one to make full use of insulation placed in the cavity while avoiding compression and thus loss of effectiveness of the insulation. In this way good U-values (low heat loss per unit area per degree temperature difference) can be obtained.

Preferred features of the invention are set forth in the dependant Claims.

Description of One Embodiment ef the Invention The invention will be further described, by way of example, with reference to the accompanying drawing, in which: Figure 1 as an isometric view, partly cut away, of the roof cladding of a building; Figure 2 is a vertical section through the roof cladding, taken at right angles to the ridge of the roof; Figure 3 is an isometric view, on a larder scale, of one of the individual supports.

The building has generally conventional structural support members, including purlins 1 which run parallel ts the ridge of the roof, the view of Figure 1 being taken looking generally down the slope of the roof. A roof lining in the form of a plurality of corrugated sheets 2 is placed over the purlins 1, the corrugations 3 running up and down the slope of the roof. individual supports 4 (which may be referred to as stools) are positioned on the troughs of the lining sheets 3, directly above the purlins 1, and are of such a height that their tops are just above the level of the tops of the corrugations 3.Long spacers 5 are then placed on the supports 4 so as to extend parallel to the ridge of the roof, each spacer 5 extending parallel to and directly above a respective purlin 1. The spacers 5 are then secured to the purlins 1 by self-drilling screws which pass through the supports 4 and the lining sheets 2 and thus secure the lining sheets 2 as well as the spacers 5; alternatively, any otYhsr suitable securing means such as rivets or welding can be used to secure the spacers 5, supports 4, sheets 3 and purlins 1 together. A quilt or other thermal insulation 6 (not shown in Figure 1) is laid over the lining sheets 2.A corrugated outer cladding 7 is then placed in position on and directly secured to the spacers 5. The method securing will depend upon the nature of the outer cladding 7. For instance, crowns of the outer cladding 7 can be directly secured to the spacers 5 by hook bolts 8 which engage under a ip on respective spacer 5, generally as described 3n Patent Application 8006098; alternatively, particularly if the outer cladding 7 is metallic, the troughs of the outer cladding 7 can be secured to the spacers 5 by self-drilling screws, or other suitable securing means such as rivets or wading can be used.All the troughs of the outer cladding 7 are thus supported by the spacers 5 and thereby spaced above and supported by lining sheets 2.

As generally described in Patent Application No. 25234/78, the roof can be provided wit a conventional construction for the ridge of the outer cladding 7 and the ridge of the lining can Ge formed by a bent lining sheet, barge-boards can be provided along the gables in a conventional manner, and eaves gutters can be provided having their rear walls below the level of the eaves edge of the lining sheet 2 and their front upstands concealing the eaves edge of the ro@@@@ valley gutter could similarly be positioned.

Alternatively, in view of the small amounts of water flowing down the sheets 2, drainage could be into the cavity of a double-skin wall claddir roof light can be provided as described in Patent Application 7933989.

The supports 4 are relatively small, and preferably have axial symmetry, as seen in parallel to the roof, the preferred sections being circular, square or octagonal. The top and bO tOhi of each support 4 should be of a reasonable size so that the support 4 cannot tilt with respect to the lining sheet 2 or the spacer 5 cannot tilt with respect to the support 4 under the leverarje imposed by wind loads on the roof. The supports 4 may be parallel-sided, though a preierredi construction has a slight taper, as indicated in the drawings. There is a hole s down t0C: centro to receive the self-drilling screw referred to above.

The preferred material is a plastics material (such as polyvinyl chloride), which gives a good thermal break and also provides a better seating on the lining sheet 2; however, any suitable material can be used, and the support 4 could for inst.-no- be made of metal. The preferred height is 26 Ngm; though for instance a 35 mm high support. 4 could be provided to allow for deeper insulation 8, A preferred diameter for a circular top or width for a square top is 25 mm. The preferred spacing along the purlin 1 is 450 mm centres.

The preferred spacers 5 are made of metal, of Z-section, with lisped top flanges, but She spacers 5 could be of any suitable shape or material, e.g.

of channel or box shape, and could even be made of rectangular-section wood.

In an alternative construction which can be used if the outer cladding is suitable, the spacers or outer cladding support members can run parallel to the fall line, e.g. at right angles to the purlins if the structural support members immediately below the lining are in the forms of purlins.

The following materials may be used in the roof cladding particularly described above: Outer cladding 7-a rigid material such as steel, aluminium, reinforced cement or plastics material; Lining sheets 2-a relatively rigid material such as galvanized steel, aluminium, reinforced cement or plastics material, with or without a painted or coated underside; Insulation 6-glass fibre quilt, for instance 60 mm thick, or plastics material foam (it should be noted that the insulation 6 may not be essential for all usages).

The invention provides a drained cavity in the ceiling, together with a thermal break in that the individual supports prevent substantial coldbridging. As the spacers 5 are clear of the crowns on the underside of the corrugations of the outer cladding 7, excessive quilt compression can be avoided, which facilitates better drainage of the lining sheets 2 and further reduces any coldbridging effect. The gap itself creates a thermal break between the outer cladding 7 and the lining sheets 2 and reduces the risk of condensation on the lower side of the lining sheets 2.

Claims

Claims

1. A roof cladding for a pitched roof, comprising: a sheet material lining, spaced individual supports on the top surface of the lining, thereby allowing water to flow down the lining; outer cladding support members each supported by a plurality of respective said supports, the outer cladding support members being spaced above the lining by said supports; and an outer cladding supported by the outer cladding support members and thereby spaced above the lining.

2. The roof cladding of Claim 1, wherein there is thermal insulation in the space between the lining and the outer cladding, which insulating material has been placed in position after securing said supports and the outer cladding support members to the top surface of the lining.

3. The roof cladding of Claim 1 or 2, wherein the outer cladding support members extend at right angles to the fall line.

4. The roof cladding of any one of the preceding Claims, wherein the lining is supported by structural support members, said supports being directly above respective structural support members.

5. The roof cladding of Claim 4, wherein the outer cladding support members extend parallel to and directly above respective structural support members.

6. The roof cladding of any one of the preceding Claims, wherein each outer cladding support member is of Z-section.

7. The roof cladding of any one of the preceding Claims, wherein the lining is corrugated with the corrugations running up the roof, and said supports rest on and are supported by troughs of the lining, leaving a gap for water on the lining to flow down the lining, the tops of said supports projecting above the tops of the corrugations of the lining.

8. The roof cladding or any one of the preceding Claims, wherein said supports are formed of plastics material.

9. The roof cladding of any one of the preceding Claims, wherein said supports each have axial symmetry, as seen in section parallel to the roof.

10. A buliding having the roof cladding of any one of the preceding Claims, and means for draining water away from the lower edges of the lining.

11. A method of constructing the roof cladding of any one of Claims 1 to 9 on a building, comprising placing the lining on structural support members of the building and securing the outer cladding support members to the structural support members through said supports and through the lining.

12. A roof cladding, substantially as herein described with reference to, and as shown in, the accompanying drawing.

13. A building, substantially as herein described with reference to, and as shown in, the accompanying drawing.

14. A method of applying a roof cladding, substantially as herein described with reference to, and as shown in, the accompanying drawing.

New Claims or Amendments to Claims filed on 13th March 1981.

Superseded Claims 1 New or Amended Claims:

1. A roof cladding for a pitched roof, comprising: a sheet material lining forming a drained cavity; outer cladding support members spaced above the lining; an outer cladding supported by the outer cladding support members and thereby spaced above the lining; and individual supports which are spaced apart along the outer cladding support members and space the outer cladding support members above the lining while allowing water to flow down the lining, substantially no said supports supporting two outer cladding support members which are spaced from one another.