Glossary of Commercial Roofing Terms
Click on a letter, to view the terms below.
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PVC: Polyvinyl Chloride – Usually associated with a thermoplastic single ply roof membrane system.
R-Value: the resistance to heat transfer of a material.
Rake: the sloped edge of a roof at the first or last rafter.
Reflectivity: the ability of the surface of a material to reflect the infra red energy of a light source.
Reglet: a groove in a wall or other surface adjoining a roof surface for use in the attachment of counterflashing.
Reinforced Membrane: a roofing or waterproofing membrane reinforced with felts, mats, fabrics, or chopped fibers.
Relative Humidity: the ratio of the weight of moisture in a given volume of air vapor mixture to the saturated (maximum) weight of water vapor at the same temperature, expressed as a percentage. For example, if the weight of the moist air is 1 pound and if the air could hold 2 pound of water vapor at a given temperature, the relative humidity (RH) is 50 percent.
Reroofing: the practice or applying new roofing material over existing roofing materials.
Ridging: an upward, "tenting" displacement of a roof membrane, frequently occurring over insulation joints, deck joints and base sheet edges. Generally associated with improper application.
Roll Roofing: the term applied to smooth surfaced or mineral surfaced coated felts.
Roof Assembly: an assembly of interacting roof components (including the roof deck) designed to weatherproof and, normally, to insulate a building's top surface.
Roof System: a system of interacting roof components (NOT including the roof deck) designated to weatherproof and, normally, to insulate a building's top surface.
Rubber : a polymeric material, which, at room temperature, is capable of recovering substantially in shape and size after removal of force.
Saturated Felt: a felt that has been partially saturated with low softening point bitumen.
SBS: see Styrene Butadiene Styrene Screen: an apparatus with apertures for separating sizes of material.
Seal: (1) a narrow closure strip made of bituminous materials; (2) to secure a roof from the entry of moisture.
Sealant: a mixture of polymers, fillers, and pigments used to fill and seal joints where moderate movement is expected; it cures to a resilient solid.
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