Base sheet " Bottom layer of built-up roofing.
Batt " A section of fiberglass or rock-wool insulation.
Bay window " Any window space projecting outward from the walls of a building, either square or polygonal in plan.
Base Sheet: a saturated or coated felt placed as the first ply in some multi-ply built up roof membranes.
Base sheet: Bottom layer of built-up roofing.
Beam: A horizontal framing member designed to carry a load from a set of joists or a roof and spanning an open space. Usually 6" x 6" or 4" x 10" or larger.
Base Sheet - This is the first ply in some multi ply built-up roofing membranes; it is usually a saturated felt or a coated felt.
Base Shoe - Wood strip, with a curved or projecting surface, used to finish intersection of base and floor.
Base Sheet: An asphalt-impregnated, or coated felt used as the first ply in some built-up and modified bitumen roof systems.
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Glass Base: Roll roofing product built on a fiberglass base sheet constructed with a heavyweight TAMKO fiberglass mat, coated with weathering-grade asphalt.
the lower plies or even the base sheet to weather.slopeThe tangent of the angle between the roof surface and the
horizontal plane, expressed as a percentage, or in inches of rise per foot
of horizontal distance. See also incline.
Envelope - a continuous membrane edge seal formed at the perimeter and at penetrations by folding the base sheet or ply over the plies above and securing it to the top of the membrane.
Base sheets are initially attached to the roofing substrate, followed by a roofing felt applied with asphalt, coal tar, a special concrete, or synthetic adhesive (asphalt or tar is the most popular).
Some roofing contractors install a base sheet to provide a fresh, clean surface under the new roof. This does not count as a ply or layer of roofing because it is used as a base or separator and is not part of the coated plies.
 See also: Roofing, Design, Roof, Sheet, Wall
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