Glossary of Commercial Roofing Terms
Click on a letter, to view the terms below.
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Counter flashing : formed metal or elastomeric sheeting secured on or into a wall, curb, pipe, rooftop unit or other surface to cover and protect the upper edge of a base flashing and its associated fasteners.
Course: (1) the term used for each application of material that form the waterproofing system or the flashing; (2) one layer of a series of materials applied to a surface (i.e., a five-course wall flashing is composed of three applications of mastic with one ply of felt sandwiched between each layer of mastic.)
Coverage: the surface (in square feet) to be continuously coated by a specific roofing material, with allowance made for a specific lap.
Crack : a separation or fracture occurring in a roof membrane or roof deck generally caused by thermally induced stress or substrate movement.
Creep: the permanent deformation of a roofing material of roof system caused by the movement of the roof membrane that results from continuous thermal stress or loading.
Cricket: a superimposed construction placed in a roof area to assist drainage.
CSPE: see Chlorosulfonated Polyethylene
Curb: a raised member used to support roof penetrations, such as skylights, mechanical equipment, hatches, etc. above the level of the roof surface.
Cutback: any bituminous roofing material that has been solvent thinned. Cutbacks are used in cold-process roofing adhesives, flashing cements, and roof coating.
Cutoff: A material seal that is designed to prevent lateral water movement into the edge of a roof system where the membrane terminate at the end of day's work or used to isolate section of the roof system. Cutoffs are usually removed before the continuation of work.
Damp proofing: treatment of a surface or structure to resist the passage of water in the absence of hydrostatic pressure.
Dead Level: the term used to describe an absolutely horizontal roof. Zero slope. see Slope.
Dead Level Asphalt: a roofing asphalt that has a softening point of 140F (60C) and that conforms to the requirements of ASTM Standard D 312, Type 1.
Dead Loads: non-moving rooftop loads, such as mechanical equipment, air conditioning units, and the roof deck itself.
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