What are some low-slope roofing terms?
APP (Atactic Polypropylene): A modifier of asphalt (see modified bitumen roof membrane) that increases the UV resistance of the bitumen as well as its flexibility at low temperatures and improves its flow resistance at high temperatures. Asphalt: A bituminous waterproofing agent applied to roofing materials during manufacture. Built-Up Roof (BUR): A flat or low-sloped roof consisting of multiple layers of asphalt and ply sheets. Base Sheet: A saturated or coated felt installed as the first ply in some multi-ply modified bitumen roofing assemblies. 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 and found in asphalts, tars, pitches and asphaltines; (2) a generic term used to denote any material composed principally of bitumen. Bituminous: Containing or treated with bitumen. Cap Sheet: A granule-surfaced coated sheet used as the top ply of a
