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Composite building element and methods of making and using the same

  • US 5,502,940 A
  • Filed: 08/17/1993
  • Issued: 04/02/1996
  • Est. Priority Date: 08/21/1992
  • Status: Expired due to Term
First Claim
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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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