Glossary of Commercial Roofing Terms
Click on a letter, to view the terms below.
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"Hot Stuff"or "Hot": the roofer's term for hot bitumen
Hygroscopic: the term used to describe a material which attract, absorbs and retains atmospheric moisture.
Incline: the slope of a roof expressed either in percent or in the number of vertical units of rise per horizontal unit of run.
Infrared Thermography: a practice of roof analysis where an infrared camera is used to measure the temperature differential of a roof surface to locate areas of underlying moisture.
Inorganic: being or composed of matter other than hydrocarbons and their derivatives, or matter hat is not of plant or animal origin.
Insulation: a material applied to reduce the flow of heat.
Inverted Roof Membrane Assembly (IRMA): a patented, proprietary variation of the "Protected Membrane Roof Assembly" in which Stryofoam Brand insulation and ballast are placed over the roof membrane. IRMA and Stryofoam are registered trademarks of the Dow Chemical Corporation.
Lap: that part of a roof or flashing that overlaps or covers any portion of the same or another type of adjacent component.
Lead: a soft workable metal used for miscellaneous flashings
.
Life cycle costing: a method of economic analysis that takes into account expected costs over the useful life of an asset.
Lift: the sprayed polyurethane foam that results from a pass. It is usually with a certain mass thickness and has a bottom layer, center mass, and a top skin in its make up.
Light reflectance: the percentage of light that is not absorbed by the surface of the material.
Live Loads: temporary loads that the roof structure must be designed to support, (e.g., people, installation equipment, rain, snow, ice, etc.)
Loose laid membranes: membranes that are not attached to the substrate except at the perimeter. Typically held in place with ballast.
Low Temperature Flexibility: the ability of a membrane to remain flexible after it has been cooled to a low temperature.
Manufacturer's Bond: a security company's guarantee that it will stand behind a manufacturer's liability to finance membrane repairs occasioned by ordinary wear within a period generally limited to 5, 10, 15, or 20 years.
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