GB2231350A

GB2231350A - Allowing for expansion & renovating flat roofs

Info

Publication number: GB2231350A
Application number: GB9010305A
Authority: GB
Inventors: Denis Roy Sugre
Original assignee: BROOKS TURKINGTON Ltd
Current assignee: BROOKS TURKINGTON Ltd
Priority date: 1989-05-10
Filing date: 1990-05-08
Publication date: 1990-11-14
Also published as: GB9010305D0

Abstract

An old roof is renovated by securing plywood 14 over the hardboard 18 and felt lining 20 of the old roof. A first sheet 212 is adhered to the upwardly facing surface of the plywood 14 around the periphery of the sheet and along two intermediates lines running from end to end along the sheet. The next sheet 112 is then placed to overlap the sheet 212 slightly, and the sheet 112 is adhered to the plywood 14 in the same way as the sheet 12, and intermediate adhesive along the overlapping portions of the sheets 112 and 212 adheres those sheets together. A polyurethane coating 22 is applied over the sheets. The lack of all-over adhesion facilitates relative movement between the sheet and the roof. The sheets may be transparent to allow visual inspection that the adhesive is making proper contact at all points. <IMAGE>

Description

IMPROVEMENTS IN OR RELATING TO ROOF COVERINGS.

The present invention relates to a method of covering a roof and to a roof covering, and to a kit of parts arranged to form a roof covering.

According to one aspect of the present invention, a method of covering a roof comprises adhering plastic sheet to a supporting surface at only a part of their facing surfaces.

According to another aspect of the present invention, a method of covering a roof comprises adhering plastics sheet to a supporting surface at a plurality of locations spaced from each other.

When a plastic sheet is adhered at locations spaced from each other the plastics may be able to expand or contract between the locations, and the plastics may deform or bellow outwardly during such expansion or contraction thereby relieving stress on the attachment of the sheet to the supporting surface.

The method may comprise adhering the plastics sheet at or adjacent to the periphery of the sheet, or alternatively or additionally along a line or lines spaced from the periphery.

The method may comprise adhering transparent sheet to the supporting surface, and the provision of the transparent sheet enables the effectiveness of the adhesion of the sheet to the supporting surface to be viewed.

The method may comprise partially overlapping a plurality of plastics sheets and adhering the sheets to the supporting surface at locations spaced from each other and, alternatively or additionally adhering the overlapping sheets to each other possibly also at locations spaced from each other.

The method may further comprise covering the sheet or sheets with a coating which coating may comprise a polyurethane coating, and the coating may be applied after the sheet or sheets have been adhered to the supporting surface.

The method may comprise using an adhesive which has been moisture cured or, alternatively or additionally, a polyurethane adhesive sealant.

The method may comprise adhering a flat sheet or sheets to a supporting surface.

The method may comprise adhering plastics sheet to a supporting surface with the adhesion defining a continuous line of contact between the sheet and supporting surface. The supporting surface may be provided with ventilation leading to the area within the continuous line of contact between the sheet and the supporting surface.

The method may further comprise renovating an existing roof.

According to another aspect of the present invention, a roof covering comprises a plastics sheet adhered to a supporting surface at only a part of their facing surfaces.

According to a further aspect of the present invention a roof covering comprises a plastics sheet which is adhered to a supporting surface at a plurality of locations spaced from each other.

The plastics sheet may be adhered to the supporting surface at or adjacent to the periphery of the sheet or, alternatively or additionally, along a line or lines spaced from the periphery of the sheet.

The plastics sheet may comprise transparent sheet.

The covering may include a plurality of overlapping plastics sheets, and those sheets may be adhered to each other, for example at locations spaced from each other.

The plastic sheet or sheets may be covered with a coating, and the coating may comprise a polyurethane coating.

The roof covering may include an adhesive which has been moisture cured, and the adhesive may comprise polyurethane adhesive sealant.

The covering may include a flat sheet or sheets.

The plastics sheet may be adhered to the supporting surface along a continuous line of contact between the sheet and supporting surface. Ventilation may be provided through the supporting surface to the area within the continuous line of contact between the sheet and the supporting surface.

According to another aspect of the present invention a kit of parts is provided which is arranged to form a roof covering substantially as herein described, the kit of parts including plastics sheet and adhesive.

The present invention may be carried into practice in various ways but one embodiment will now be described by way of example, and with reference to the accompanying drawing which is a schematic perspective view of part of a roof 10.

A plurality of plastics sheets 12, 112 and 212 are stuck along a supporting plywood sheet 14 by adhesive 16. The plywood 14 is nailed to hardboard 18 by nails (not shown) which pass through an old felt lining 20. A polyurethane coating 22 covers the sheets 12, 112 and 212, although only part of that coating 22 has been shown.

An old roof to be repaired, comprising the hardboard 18 and the felt lining 20 first has any loose chippings taken off. New plywood 14 is then nailed into the position shown, and the first sheet 212 is adhered to the upwardly facing surface of the plywood 14 around the periphery of the sheet, and along two intermediate lines running from end to end along the sheet. The next sheet 112 is then placed to overlap the sheet 212 slightly, and the sheet 112 is adhered to the plywood 14 in the same way as the sheet 212, and intermediate adhesive along the overlapping portions of the sheets 112 and 212 adheres those sheets together. The sheet 12 is then placed in position and adhered to the plywood 14 and along the complete extent of the overlap with the sheet 112.

The sheets 12, 112 and 212 are clear plastics sheet and accordingly the way in which the adhesive grips the plywood 14 can be viewed as the sheets are applied.

Accordingly, if the adhesive is not contacting particularly well at a location, more pressure can be applied to the sheet at that region in order to more firmly disperse and affix the adhesive. The adhesive is applied to the sheets before the sheets are located on the plywood 14. The sheets can all be cut from a single roll of sheeting if desired.

The spaced adhesive securing the sheets to each other and to the plywood 14 allows the sheets to expand and contract between the locations where they are adhered without the sheeting or the adhesive bond to the plywood undergoing undue stress. In an alternative embodiment the sheets 12 can be generally square in configuration.

The sheets shown are 1.5m wide with 0.5m being located under the overlap.

The adhesive 16 is moisture aged in order that the plastics sheet can be placed in position in atmospheres which may be slightly damp without the adhesive becoming brittle through drying out.

Once the sheets are located in the position shown the polyurethane coating 22 can be applied in order to achieve improved waterproofing and in order to protect the Glass Reinforced Plastic sheet from possible harmful effects of the ultra violet light. In addition, the coating 22 provides a decorative finish. It is estimated that the coating 22 will approximately double the lifespan of the roof covering.

In order to reduce any tendency for expansion of the sheet to tear or shear the adhesion between the sheet and the plywood 14 as a result of a vacuum tending to hold the sheet against the plywood on such expansion, a series of ventilation holes (not shown) may be provided through the plywood 14 at least. Thus air may enter between the plywood and sheet and the area enclosed by the adhesive to allow the sheet to come slightly away from the plywood upon expansion of the sheet. The ventilation holes may be drilled in the plywood before the sheets are placed on the plywood after the intended location of the adhesive is known.

It is possible that a kit may be sold in order that roofs may be covered or refurbished with the kit comprising possibly a roll of clear plastics sheet and adhesive material such as that sold under the Trade Mark SECOFLEX, which is a moisture cured polyurethane adhesive sealant, together with the polyurethane coating and instructions on how to use the parts.

Claims

1. A method of covering a roof comprising adhering plastics sheet to a supporting surface at only a part of their facing surfaces.

2. A method as claimed in Claim 1 comprising adhering plastics sheet to the supporting surface at a plurality of locations spaced from each other.

3. A method as claimed in Claim 1 or 2 comprising adhering the plastics sheet at the periphery of the sheet.

4. A method as claimed in Claim 1, 2 or 3 comprising adhering the plastics sheet adjacent to the periphery of the sheet.

5. A method as claimed in any preceding claim comprising adhering the plastics sheet along a line spaced from the periphery.

6. A method as claimed in any preceding claim comprising adhering the plastics sheet along lines spaced from the periphery.

7. A method as claimed in any preceding claim comprising adhering transparent sheet to the supporting surface.

8. A method as claimed in any preceding claim comprising viewing the adhesion between the plastics sheet and the supporting surface through the plastics sheet.

9. A method as claimed in any preceding claim comprising partially overlapping a plurality of plastics sheets and adhering the sheets to the supporting surface at locations spaced from each other.

10. A method as claimed in any preceding claim comprising partially overlapping a plurality of plastics sheets and adhering the overlapping sheets to each other.

11. A method as claimed in Claim 10 comprising adhering the overlapping sheets to each other at locations spaced from each other.

12. A method as claimed in any preceding claim comprising covering the sheet or sheets with a coating.

13. A method as claimed in Claim 12 in which the coating comprises a polyurethane coating.

14. A method as claimed in Claim 12 or Claim 13 in which the coating is applied after the sheet or sheets have been adhered to the supporting surface.

15. A method as claimed in any preceding claim comprising using an adhesive which has been moisture cured.

16. A method as claimed in any preceding claim comprising using, as an adhesive, a polyurethane adhesive sealant.

17. A method as claimed in any preceding claim comprising adhering a flat sheet or sheets to a supporting surface.

18. A method as claimed in any preceding claim comprising adhering plastics sheet to a supporting surface with the adhesion defining a continuous line of contact between the sheet and supporting surface.

19. A method as claimed in Claim 18 comprises providing the supporting surface with ventilation leading to the area within the continuous line of contact between the sheet and the supporting surface.

20. A method as claimed in any preceding claim comprising covering a roof to renovate a roof.

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

22. A roof covering comprising a plastics sheet adhered to a supporting surface at only a part of their facing surfaces.

23. A roof covering as claimed in Claim 22 in which the plastics sheet is adhered to the supporting surface at a plurality of locations spaced from each other.

24. A covering as claimed in Claim 22 or 23 in which the plastics sheet is adhered to the supporting surface at or adjacent to the periphery of the sheet.

25. A roof covering as claimed in Claim 22, 23 or 24 in which the plastics sheet is adhered to the supporting surface along a line or lines spaced from the periphery of the sheet.

26. A roof covering as claimed in any of Claims 22 to 25 in which the plastics sheet comprises transparent sheet.

27. A covering as claimed in any of Claims 22 to 26 including a plurality of overlapping plastics sheets.

28. A covering as claimed in Claim 27 in which the overlapping plastics sheets are adhered to each other.

29. A covering as claimed in Claim 28 in which the overlapping plastics sheets are adhered to each other at locations spaced from each other.

30. A covering as claimed in any of Claims 22 to 29 in which the plastics sheet is covered with a coating.

31. A covering as claimed in Claim 30 in which the coating comprises a polyurethane coating.

32. A covering as claimed in any of Claims 22 to 31 including an adhesive which has been moisture cured.

33. A covering as claimed in Claim 32 in which the adhesive comprises polyurethane adhesive sealant.

34. A covering as claimed in any of Claims 22 to 33 including a flat sheet.

35. A covering as claimed in any of Claims 22 to 34 in which the plastics sheet is adhered to the supporting surface along a continuous line of contact between the sheet and the supporting surface.

36. A covering as claimed in Claim 35 in which ventilation is provided through the supporting surface to the area within the continuous line of contact between the sheet and the supporting surface.

37. A roof covering substantially as herein referred to with reference to, and as shown in the accompanying drawing.

38. A kit of parts arranged to form a roof covering substantially as herein described, the kit of parts including plastics sheet and adhesive.