Roofing Terminology
(Click on a letter to learn more)
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Tapered Edge Strip
A tapered insulation strip used to elevate the roof at the perimeter and at curbs that extend through the roof; provides a gradual transition from one layer of insulation to another.
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 Re-Roof
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 and to diagnose the condition of the existing membrane (e.g., to detect leaks or blisters).
Thermal Conductance
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
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.
Thermal Resistance
An index of material applied to reduce the flow of heat.
Thermal Shock
The stress producing phenomenon resulting from sudden temperature changes in a roof membrane. (For example, when a rain shower follows brilliant, hot sunshine.)
Thermoplastic
Materials that soften when heated and harden when cooled.
Thermoplastic Olefin Membrane (TPO)
A blend of polypropylene and ethylene-propylene polymers. Colorant, flame retarants, UV absorbers, and other proprietary substances, which may be blended with the TPO to achieve the desired physical properties.
Thermoset
A material that solidifies or "sets" irreversibly when heated. This property is usually associated with cross-linking of the molecules induced by heat or radiation.
Through-Wall Flashing
A water resistant membrane or material assembly extending through a wall and its cavities, positioned to direct any water entering the top of the wall exterior.
Tie-Off
A seal used to terminate a roofing application at to the adjacent roofing system.
Tuckpointing
Process of removing deteriorated mortar from an existing masonry joint and troweling new mortar or other filler into the joint.
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