Thermopane window The trade name of a double paned window which provides better insulation than a single pane of glass.
Thompson’s Water Seal A silicone based water repellent with the trade name of the manufacturer. The substance can be applied to a porous surface to render it water proof.
Threshold The plate at the floor level of a door located between the casing edges that mark the interior from the exterior of the door.
THW or TW Electrical wire A single strand of insulated electrical wire that must be installed in a protective conduit or container when in use.
Toe-nailed A means of fastening the end of a plank such as a floor joist to the side of a beam with nails where the nails are the only means of supporting the end of the joists.
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