ASTM -American Society for Testing and Materials
Asphalt Roof Cement -A trowelable mixture of solvent-based bitumen, mineral stabilizers, other fibers and/or filler
Back-Nailing -The practice of nailing the back portion of a roofing ply, steep roofing unit, or other components in a manner so that the fasteners are covered by the next sequential ply, or course, and are not exposed to the weather in the finished roof system .
Base Sheet -An impregnated, saturated, or coated felt placed as the first ply in some multi-ply built-up and modified bitumen roof membranes.
Cant Strip - A beveled or triangular-shaped strip of wood, wood fiber, perlite, or other material designed to serve as a gradual transitional plane between the horizontal surface of a roof deck or rigid insulation and a vertical surface.
Cap Sheet - A granule-surface coated sheet used as the top ply of some built-up or modified bitumen roof membranes and/or flashing.
Coping -The covering piece on top of a wall which is exposed to the weather, usually made of metal, masonry, or stone. It is preferably sloped to shed water back onto the roof.
Counter Flashing -The metal or siding material that is installed over roof-top base flashing systems.
Crickets -A peaked water divert installed behind chimneys and other large roof projections. Effectively diverts water around projections.
Deck - A structural component of the roof of a building. The deck must be capable of safely supporting the design dead and live loads, including the weight of the roof systems, and the additional live loads required by the governing building codes. Decks are either non-combustible (e.g., corrugated metal, concrete, or gypsum) or combustible (e.g., wood plank or plywood), and provide the substrate to which the roofing or waterproofing system is applied.
Fascia -Trim board behind the gutter and/or eaves.
Eaves - The roof edge from the fascia to the structure’s outside wall. In general terms, the first three feet across a roof is termed the eave.
Elastomeric -: The elastic, rubber-like properties of a material that will stretch when pulled and will return relatively quickly to its original shape when released.
Gable -The triangular upper part of a wall closing the end of a ridged roof.
Flashing Cement - Sealant designed for use around flashing areas, typically thicker than plastic cement.
"L" Flashing - Continuous metal flashing consisting of several feet of metal. Used at horizontal walls, bent to resemble an "L".
Parapet Wall -That part of a perimeter wall immediately adjacent to the roof which extends above the roof.
Soffit -The board that encloses the underside of that portion of the roof which extends out beyond the sidewall of the house.
Rake - The slanting edge of a gabled roof extending beyond the wall of the house.
Re-Cover-The addition of a new roof membrane or steep-slope roof covering over a major portion of an existing roof assembly. This process does not involve removal of the existing roofing.
Reroofing - The process of re-covering, or tearing-off and replacing an existing roof system
Ridge -The horizontal line at the top edge of two slopping roof planes.
Valleys-Area where two adjoining sloped roof planes intersect on a roof creating a "V" shaped depression.
Vent - An opening designed to convey air, heat, water vapor or other gas from inside a building or a building component to the atmosphere.
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