Dictionary

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Click one of the letters above to be taken to a page of all terms beginning with that letter.
b
Ballast

An aggregate for application over single-ply, loose-laid roofing systems.

Base Flashing
See also: Flashing
Base Ply

The lowermost ply of roofing material in a roof membrane assembly.

Base Sheet

A saturated or coated felt placed as the first ply in some multi-ply built-up roof membranes.

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 asphaltites; (2) a generic term used to denote any material composed principally of bitumen.

Blister

An enclosed pocket of air mixed with water or solvent vapor, trapped between impermeable layers of felt, or between the felt and substrate.

Blisters

Raised areas or bubbles that may appear on the surface of asphalt roofing after installation.

Blow-off

A condition in which shingles flutter or flap up and down with the wind, tear, and finally blow off the roof entirely.

Buckling

The formation of wrinkles or furrows across a shingle or shingles.