Asphalt

A dark brown to black cementitious material in which the predominating constituents are bitumens that occur in nature or are obtained in petroleum processing. See bitumen. Asphalt may be further refined to conform to various roofing grade specifications:
asphalt, dead-level: A roofing asphalt conforming to the requirements of ASTM D312, Type I.

asphalt, flat: A roofing asphalt conforming to the requirements of ASTM D312, Type II.

asphalt, steep: A roofing asphalt conforming to the requirements of ASTM D312, Type III.

asphalt, special steep: A roofing asphalt conforming to the requirements of ASTM D312, Type IV.

asphalt, waterproofing: A waterproofing asphalt conforming to the requirements of ASTM D449, Types I, II and III.

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