Glossary of Commercial Roofing Terms
Click on a letter, to view the terms below.
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EPDM: Ethylene Propylene Diene Monomer (commonly referred to as a ";rubber roof")
Epoxy: a class of synthetic, thermosetting resins that produce tough, hard, chemical-resistant coatings and adhesives.
Equilibrium Moisture Content (EMC): (1) the moisture content of material stabilized at a given temperature and relative humidity, expressed as percent moisture by weight; (2) the typical moisture content of a material in any given geographical area.
Equiviscous Temperature (EVT): the temperature at which bitumen attains the proper viscosity for built up membrane application.
Expansion Joint: a structural separation between two building elements designed to minimize the effect of the stresses and movements of a building's components and to prevent these stresses from splitting or ridging the roof membrane.
Exposure: (1)the transverse dimension of a roofing element not overlapped by an adjacent element in any roof system. The exposure of any ply in a membrane may be computed by dividing the felt width minus 2 inches by the number of shingled plies; thus, the exposure of a 36-inch-wide felt in a shingled, four-ply membrane should be 8 1/2 inches; (2) the time during which a portion of a roofing element is exposed to the weather.
Extrusion: a manufacturing process which consists of forcing batched and formulated material through an orifice.
Fabric: a woven cloth of organic or inorganic filaments, threads, or yarns.
Factory Mutual: an organization that classifies roof assemblies for their fire characteristics and wind-uplift resistance for insurance companies in the United States.
Felt: a fabric manufactured from vegetable fibers (organic felts), asbestos fibers (asbestos felts), or glass fibers (glass fiber felts). The manufacturer process involves mechanically interlocking the fibers of the particular felt material in the presence of moisture and heat.
Ferrule: a small metal sleeve placed inside a gutter at the top. A spike is nailed through the gutter into the fastening board. The ferrule acts as a spacer in the gutter to maintain its original shape.
Fine Mineral Surfacing: a water soluble, inorganic material, more than 50 percent of which passes through the No. 35 sieve, that may be used on the surface of roofing material.
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