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Keyway -- See Cutout and Shakes.
Laminated Shingles -- Strip shingles made with fiberglass mat and asphalt. Also called dimensional or architectural shingles.
Leads -- See Plumbing Vent Jack.
Low Slope Application -- Method of installing asphalt shingles (or other material), on roof slopes between 2 and 4 inches per foot. Involves decreasing the amount of material exposure (to the weather), and increasing the ply of underlayment.
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Mansard Roof -- A type of roof containing two sloping planes of different pitch on each of four sides. The lower plane is much steeper than the upper, often approaching vertical. Contains no gables.
Mastic -- See Asphalt Cement
Mineral Surfaced Roofing -- Asphalt shingles, roll roofing and torchdown that are covered with granules.
Nesting -- A method of re-roofing with new asphalt shingles over old shingles in which the top edge of the new shingle is butted against the bottom edge of the existing shingle.
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Open Valley -- Method of valley construction in which shingles on both sides of the valley are trimmed along a straight line on each side of the valley. Shingles do not extend across the valley so valley metal or roll roofing is required. See W Valley.
Organic Mat -- An asphalt roofing base material manufactured from cellulose fibers.
Overhang -- That portion of the roof structure that extends beyond the exterior walls of a building. See Soffit.