Tag: asphalt

Air-Blown Asphalt

Asphalt produced by blowing air through molten asphalt to raise its softening point and modify other properties.

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.

Asphalt Emulsion

A mixture of asphalt particles and emulsifying agent, such as bentonite clay and water.

Asphalt Felt

An asphalt-saturated and/or asphalt-coated felt (see Felt).

Asphalt Primer

See Primer

Asphalt Roof Cement

A trowelable mixture of solvent-based bitumen, mineral stabilizers, other fibers and/or fillers. Classified by ASTM Standard D 2822-1 Asphalt Roof Cement, and D 4586-2 Asphalt Roof Cement, Asbestos-Free, Types I and II. Type I is sometimes referred to as “plastic cement,” and is made from asphalt characterized as self-sealing, adhesive and ductile, and conforming to ASTM Specification D 312, Type I; Specification D 449, Types I or II; or Specification D 946. Type II is generally referred to as “vertical-grade flashing cement,” and is made from asphalt characterized by a high softening point and relatively low ductility, and conforming to the requirement of ASTM Specification D 312, Types II or III; or Specification D 449, Type III.

See Plastic cement and Flashing cement.

Asphalt Shingle

A shingle manufactured by coating a reinforcing material (felt or fibrous glass mat) with asphalt and having mineral granules on the side exposed to the weather. (see Shingle)

Asphaltine

A high molecular weight hydrocarbon fraction precipitated from asphalt by a designated solvent (paraffinic naphtha) at a specified temperature and solvent-asphalt ratio

Bitumen

(1) a class of amorphous, black or dark colored, (solid, semi-solid or viscous) cementitious substances, natural or manufactured, composed principally of high molecular weight hydrocarbons, soluble in carbon disulfide, and found in asphalts, tars, pitches and asphaltenes; (2) a generic term used to denote any material composed principally of bitumen, typically asphalt or coal tar

Dead-level asphalt

See Asphalt

Flood Coat (Pour Coat)

The surfacing layer of bitumen into which surfacing aggregate is embedded on an aggregatesurfaced built-up roof.

Glaze Coat

(1) the top layer of asphalt on a smooth-surfaced built-up roof membrane; (2) a thin protective coating of bitumen applied to the lower plies or top ply of a built-up roof membrane when application of additional felts or the flood coat and aggregate surfacing are delayed. (also see Flood coat.)

Hot or Hot Stuff

A roofing worker’s term for hot bitumen.