Dictionary

a • b • c • d • e • f • g • h • i • j • l • m • o • p • r • s • t • u • v • w
Click one of the letters above to be taken to a page of all terms beginning with that letter.
a
Aggregate

(1) Crushed stone crushed slag or water-worn gravel used for surfacing a built-up roof; (2) any granular mineral material.

Algae discoloration

A type of roof discoloration caused by algae. Commonly, but inaccurately, called fungus growth. Usually it is dark brown to black in color.

Alligatoring

The cracking of the surfacing bitumen on a built-up roof, producing a pattern of cracks similar to an alligator's hide; the cracks may or may not extend through the surfacing bitumen.

APP

(Atactic Polypropylene) used to make asphalt less viscous at low temperatures yet very pliable at high temperatures. Roofing materials modified in this way are often called "Heat Weldable" because they are applied using a torch.

ASTM

American Society for Testing and Materials. A voluntary organization concerned with development of consensus standards, testing procedures and product specifications.