Glossary of Commercial Roofing Terms
Click on a letter, to view the terms below.
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Bituminous: containing or treated with bitumen. Examples: bituminous concrete, bituminous concretes, bituminous felts and fabrics, bituminous pavement.
Bituminous Grout: a mixture of bituminous material and fine sand that will flow into place without mechanical manipulation when heated.
Blind Nailing: the practice of nailing the back portion of a roofing ply.
Blister: a spongy raised portion of a roof membrane, ranging in area from 1 inch in diameter and of barely detectable height upward. Blisters result from the pressure buildup of gases entrapped in the membrane system. these gases most commonly are air and/or water vapor. Blisters usually involve delamination of the underlying membrane plies.
Bond : the adhesive and cohesive forces holding two roofing components in intimate contact.
Brooming: embedding a ply of roofing material by using a broom to smooth out the ply and ensure contact with the adhesive under the ply.
BTU: (British Thermal Unit) - the heat energy required to raise the temperature of 1 pound of water 1 degree Fahrenheit.
Buckle: an upward, elongated tenting displacement of a roof membrane frequently occurring over insulation or deck joints. A buckle may be an indication of movement within a roof assembly, and usually associated with improper installation.
Built-up Roof Membrane: a continuous, semi-flexible roof membrane assembly, consisting of plies of saturated felts, coated felts, fabrics or mats between which alternate layers of bitumen are applied, generally surfaced with mineral aggregate, bituminous materials, or a granule-surfaced roofing sheet. (Abbreviation: BUR.)
Butyl: a rubber like material produced by copolymerizing isobutylene with a small amount of isoprene, Butyl may be manufactured in sheets, or blended with other elastomeric materials to make sealants and adhesives.
Cant Strip: a beveled strip of wood or wood fiber that fits into the angle formed by the intersection of a horizontal surface and a vertical surface. The 45-degree slope of the exposed surface of the cant strip provides a gradual angular transition from the horizontal surface to the vertical surface. see Flashing.
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