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Tab -- The exposed portion of three-tab strip shingles defined by cutouts.
Tar & Gravel -- See Hot Tar.
Telegraphing -- A shingle distortion that may arise when a new roof is applied over an uneven surface (such as an old roof). This is particularly a problem with a three-tab shingles over an old roof or roofs.
Three-Dimensional Shingles -- See laminated shingles.
Three-Tab Shingles -- Flat asphalt strip shingles with 3 "tabs." The "tabs" are created by two cutouts or keyways.
Tin Shingles -- Flat pieces of metal used for flashing or leak repair. See Step Flashing.
To The Weather -- See Exposure.
Torchdown -- A heat applied membrane (bitumen), used on flat or low sloped roof decks. It is heat welded onto a fiberglass impregnated base sheet with a torch as it is rolled out forming a single ply roofing system. Replaces inferior hot tar roofs which are typically 2 or 3 ply and can prematurely fail as the ply separate forming brittle bubbles and ponding of water.
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Underlayment -- A membrane or lining, typically asphalt saturated felt, used beneath roofing to provide protection for the deck and/or as a vapor barrier. See also Shake Liner.
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Valley -- The internal angle formed by the intersection of two sloping roof planes. See Closed cut valley, W Valley Metal and Woven Valley.
Valley Flashing or Valley Metal -- See W Valley Metal.
Vapor Barrier -- Any material used to prevent the passage of water vapor. See underlayment.
Vent -- Any outlet for air through the roof deck such as a pipe or stack or for ventilation of the space under the deck such as a ridge vent, roof vent or soffit vent.
Vent Pipe -- Pipe extending through roof deck to ventilate plumbing system.
Vent Sleeve -- See Plumbing Vent Jack.
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W Valley Metal -- "w" valley metal is termed as such because the metal lining of the valley is formed in the shape of a W. In this case the W would be very wide (about 24"), with a small ^ shape in the middle to keep water from flowing back up the roof on either side of the valley. Due to the amount of water wear in valleys, the W-valley metal should be at least 26 gauge steel with a baked enamel finish. Many companies use 28 gauge metal which is a thinner material than 26 gauge.
Wood Shakes -- See Shakes
Wood Shingles-- Wood shingles are a thin rectangular roofing material, laid in overlapping rows to cover the roof deck or side of a house. Wood shingles are typically smaller than their shake counterpart but often the two are incorrectly referred to as the other.
Woven Valley -- Method of valley construction in which asphalt shingles from both sides of the valley extend across the valley and are woven together by overlapping alternate coursed as they are applied. This is considered by many to be an inferior method of valley construction.