Glossary of Commercial Roofing Terms
Click on a letter, to view the terms below.
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Styrene Butadiene, Styrene Copolymer (SBS): high molecular weight polymers that have both thermoset and thermoplastic properties formed by the block copolymeriztion of styrene and butadiene monomers. These polymers are used as the modifying compound in SBS polymer modified roofing membranes to impart rubber like qualities to the asphalt.
Substrate: the surface upon which the roofing or waterproofing membrane is applies (i.e. the structural deck or insulation).
Superimposed Loads: loads that are added to existing loads. For example, a large stack of insulation boards placed on top of a structural steel deck.
Tapered Edge Strip: a tapered insulation strip used to (1) elevate the roof at the perimeter and at curbs that extend through the roof; (2) provide a gradual transition from one layer of insulation to another.
Taping: see Stripping Tar: a brown or black bituminous material, liquid or semi solid in consistency, in which the predominating constituents are bitumens obtained as condensates in the processing of coal, petroleum, oil-shale, wood, or other organic materials.
Tarred Felt: a felt that has been saturated with refined coal tar.
Tear Off and Reroof: the removal of all roof system components down to the structural deck followed by the installation of a new roof system.
Tear Strength: the maximum force required to tear a specimen.
Test Cut: a sample of the roof membrane, usually 4 inches x 40 inches in size, that is cut from a roof membrane to:
- Determine the weight of the average interply bitumen poundage
- Diagnose the condition of the existing membrane (e.g., to detect leaks or blisters).
Thermal Conductance (C): a unit of heat flow that is used for specific thickness of material or for materials of combination construction, such as laminated insulation.
Thermal Conductivity (k): the heat energy that will be transmitted by conduction through 1 square foot of 1 inch thick homogeneous material in one hour.
Thermal Insulation: a material applied to reduce the flow of heat
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