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Threshold

The bottom metal or wood plate of an exterior door frame. Generally they are adjustable to keep a tight fit with the door slab. Raised member at the floor within the door jamb. Its purpose is to provide a divider between dissimilar flooring materials or serve as a thermal, sound or water barrier.

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Through-penetrations

Through-penetration, or "poke-through" openings as they are sometimes called, are holes that penetrate an entire floor or wall assembly to allow the passage of piping, ducts, conduit, cable trays, electrical cables, communications wiring, etc.

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Thermostat

A device which relegates the temperature of a room or building by switching heating or cooling equipment on or off. A temperature-sensitive instrument that controls the flow of electricity to units used to heat and cools spaces in a building.

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Toenail

Method of fastening two boards together as in a "T" by driving nails into the board that forms the stem of the "T" at an angle so they enter the other board and cross each other.

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TJI or TJ

Manufactured structural building component resembling the letter "I". Used as floor joists and rafters. I-joists include two key parts: flangesand webs. The flangeor from of the I joist may be made of laminated veneer lumber or dimensional lumber, usually formed into a 1 ½" width. The web or center of the I-joist is commonly made of plywood or oriented strand board (OSB). Large holes can be cut in the web to accommodate duct work and plumbing waste lines. I-joists are available in lengths up to 60' long.

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Tongue-and-Groove Joint

Joint where the projection or "tongue" of one member engages the mating groove of the adjacent member to minimize relative deflection and air infiltration; widely used in sheathing, flooring and paneling. Tongues may be in "V," round or square shapes.

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