Composite building element and methods of making and using the same
First Claim
1. A composite roofing element comprising a first layer of aggregate based material having an upper surface which in use forms the exterior surface of said roofing element and a lower surface being in abutment with an upper surface of a second layer, said second layer having a density less than that of said first layer, said element being provided with a wedge shaped region depending from its underside in use, said wedge shaped region being integral with said second layer and wherein said abutting surfaces of said first and second layers include complementary interlocking engaging means comprising one or more male and female members.
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Accused Products
Abstract
A composite roofing element comprises a first layer of aggregate based material, a second layer of material having a density less than that of the first layer and has a wedge shaped region depending from its underside. The wedge shaped region is preferably integral with the second layer which can be made of an expanded polymer, expanded polystyrene being particularly suitable. Overlapping structure on the side edges and a recess in the thick end of the wedge enable adjacent elements to interlock with each other. By using such lightweight roofing elements the requirement for a substantial load bearing supporting structure is reduced.
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Citations
33 Claims
- 1. A composite roofing element comprising a first layer of aggregate based material having an upper surface which in use forms the exterior surface of said roofing element and a lower surface being in abutment with an upper surface of a second layer, said second layer having a density less than that of said first layer, said element being provided with a wedge shaped region depending from its underside in use, said wedge shaped region being integral with said second layer and wherein said abutting surfaces of said first and second layers include complementary interlocking engaging means comprising one or more male and female members.
- 11. A composite roofing element according to claim 11 provided with means for overlapping in use with adjacent elements.
- 28. A composite roofing element comprising a first layer of aggregate based material and a second layer having a density less than that of said first layer, a surface of said first layer disposed in abutment with a surface of said second layer, said element including a wedge shaped region depending from its underside, and one or more resilient protuberances disposed on said surface of said second layer which abuts said surface of said first layer, said one or more protuberances extending through said first layer.
- 30. A composite roofing element comprising a first layer of aggregate based material and a second layer having a density less than that of said first layer, a surface of said first layer disposed in abutment with a surface of said second layer, said element including a wedge shaped region depending from its underside, said abutting surfaces of said first and second layers including complementary interlocking engaging means comprising one or more male and female members.
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32. In a roofing element possessing a cementitious portion providing with an aperture adapted to receive a nail for securing said roof tile to a roof structure, the improvement comprising:
a resilient protuberance in said aperture adapted to receive a nail therethrough and to substantially prevent passage of moisture along a shank of the nail. - View Dependent Claims (33)
Specification