| 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 |
| 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. |
| TPO |
See Thermoplastic Olefin. |
| Tuckpointing |
process of removing deteriorated
mortar from an existing masonry joint and troweling
new mortar or other filler into the joint. |
