Click on colorful terms to see a picture. Some terms, such as various methods, will not have pictures.
Tab: The bottom portion of traditional shingle separated by the shingle cut-outs.
Tear-Off: Removal of existing roofing materials down to the roof deck.
Telegraphing: A shingle distortion that may arise when a new roof is applied over an uneven surface.
Three-Tab Shingle: A single-layer shingle having three tabs.
T-Lock Shingle: An asphalt shingle which interlocks with other shingles on the same course, and shaped like a “T”. These shingles are no longer manufactured as of 2005, and are considered by some companies a serious insurance hazard because they cannot be repaired and must be replaced if damaged.
Top Lap: That portion of the roofing covered by the succeeding course after installation.
Transitions: When a roof plane ties into another roof plane that has a different pitch or slope.
UL: Underwriters Laboratories, LLC
UL Label: Label displayed on packaging to indicate the listing for fire and/or wind resistance of asphalt roofing.
Underdriven: Term used to describe a fastener not fully driven flush to the shingle’s surface.
Undereave: Underside area of the overhang at the eave of the roof.
Underlayments: A layer of asphalt-saturated felt (sometimes referred to as tar paper) which is laid down on a bare deck before shingles are installed to provide additional protection for the deck.
Valley: The internal angle formed by the intersection of two sloping roof planes to provide water runoff. Shaped like a “V”.
Vapor: Term used to describe moisture-laden air.
Vapor Retarder: Any material used to prevent the passage of water vapor. Material which, when installed on the high-vapor pressure (warm in winter) side of a material, retards the passage of moisture vapor to the lower-pressure (cold in winter) side. Note exception: Florida and Gulf Coast. Check local building codes to determine on which side the vapor retarder should be placed.
Vent: Any outlet for air that protrudes through the roof deck, such as a pipe or stack. Any device installed on the roof, gable, or soffit for the purpose of ventilating the underside of the roof deck.
Ventilators: Devices that eject stale air and circulate fresh air (e.g. ridge, roof, gable, undereave, foundation, or rafter vents and vented soffit panels).
Warm Wall: The finished wall inside of a structure, used in roofing to determine how far up the deck to install waterproof underlayments at eaves.
Warranty: The written promise to the owner of roofing materials for material-related problems.
Waterproof Underlayments: Modified bitumen based roofing underlayments. Designed to seal to wood decks and waterproof critical leak areas.
Woven Valley: Method of valley construction in which shingles on both sides of the valley extend across the valley and are woven together by overlapping alternate courses as they are applied. The valley flashing is not exposed.