Roofing Terminology
(Click on a letter to learn more)
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Aggregate
Crushed stone, crushed slag or water-worn gravel used for surfacing a built-up roof; any granular mineral material.
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.
Ambient Temperature
The temperature of the air.
Application Rate
The quantity (mass, volume or thickness) of material applied per unit area.
Area Divider
A raised, double wood member attached to a properly flashed wood base plate that is anchored to the roof deck. It is used to relieve thermal stresses in a roof system where no expansion joints have been provided.
Asbestos
A group of natural, fibrous, impure silicate materials.
Asphalt
A dark brown to black material in which the predominating constituents are bitumens, which occur in nature or are obtained in petroleum processing.
Asphalt, Air Blown
An asphalt produced by blowing steam through molten asphalt to modify its properties, normally used for highway bitumen.
Atactic Polypropylene
A group of high molecular weight polymers formed by the polymerization of propylene.
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