Asphalt

A dark brown or black substance found in a natural state or, more commonly, left as a residue after evaporating or otherwise processing crude oil or petroleum. Asphalt may be further refined to conform to various roofing grade specifications:

  • Dead-level asphalt
    a roofing asphalt conforming to the requirements of ASTM Specification D 312, Type I.
  • Flat asphalt
    a roofing asphalt conforming to the requirements of ASTM Specification D 312, Type II.
  • Steep asphalt
    a roofing asphalt conforming to the requirements of ASTM Specification D 312, Type III.
  • Special steep asphalt
    a roofing asphalt conforming to the requirements of ASTM Specification D 312, Type IV.