| http://www.w3.org/ns/prov#value | - At the present time there are a large number of materials used for roofing such as asbestos, wood or asphalt shingles, roofing tiles made of cement or clay, slate, coatings of tar, plastic or asphalt including asphalts modified with some synthetic resins, and roofing felt or some other roofing membrane onto which such asphalt, tar or a synthetic resin is placed.
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