MIL-HDBK-1001/SA
Blister. A spongy, humped portion of a roof membrane, formed by entrapped air/vapor mixture under pressure, with the blister chamber located either between felt plies (i.e., interply) or at the membrane-substrate interface (interfacial).
Blocking. Continuous wood components anchored to the deck at roof perimeters and openings and doubling as cross-sectional fillers and anchorage bases, used in conjunction with nailers.
Brooming. The field procedure of pressing felts into a layer of fluid, hot bitumen to obtain continuous adhesion - i.e., elimination of blister originating voids - of the bitumen film.
Btu (British thermal unit). Heat energy required to raise the temperature of 1 pound of water 1F.
Built-up roof membrane. A continuous, semiflexible roof covering of laminations or plies of saturated or coated felts or mats alternated with layers of bitumen, usually surfaced with mineral aggregate or asphaltic materials.
"Bull". Roofer's term for plastic cement.
BUR. Abbreviation for built-up roof.
Camber. Upward deflection built into a structural member subjected to flexural stresses to counteract the downward deflection from gravity loads.
Cant strip. Strip of wood, wood-fiber, or perlite board, triangular or trapezoidal in cross section, serving as transitional plane between horizontal and vertical surfaces. The cant provides backing for the stiff flashing felts of built-up roof construction, reducing the risk of cracking by halving the bend angle from 90 to 4S degrees.
Cap flashing. See Flashing.
Cap sheet. A mineral-surfaced, coated felt or mat used as the top ply of a built-up roof membrane.
Centistoke (cs). Unit of viscosity (antonym of fluidity). Water has a viscosity of roughly 1 cs; light cooking oil, l00 cs.
Channel mopping. See Strip mopping, under Mopping.
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