T-astragal This is the vertical strip between doors in a French door unit. It’s always attached to the inactive door.
	T-handle hardware A casement or awning operating handle, this hardware is in the shape of a T.
	Tape-Glaze The method by which glass is set and sealed into a sash or window opening with a double adhesive tape.
	TDW See fading.
	TegraTite® The TegraTite® installation system includes a sill drain mat, which sits on the rough opening of a window and directs any incidental water away from the wall, and butyl-based adhesive flashing tape for a tighter, more energy efficient installation.
	Tempered glass This glass is heat-treated during manufacturing for extra strength, enabling it to withstand abnormal force or pressure on its surface. And it will not break into sharp pieces. Local building codes often require tempered glass to be used in all windows that are close to the floor or near doors, bathtubs or showers.
	Tenon A tenon is a rectangular projection cut out of a piece of wood for insertion into a mortise.
	Terminal block See jamb liner clutch.
	Textured glass This is any glass that includes a decorative texture. It often provides a partial or fully obscured view.
	Thermal break This is an element of low conductance placed between elements of higher conductance to reduce the flow of heat or cold. It is often used in aluminum windows.
	Thermal crack A thermal crack (or thermal stress) is defect caused when the center of the glass becomes warmer than the edges.
	Thermally broken sill A window sill that includes an element of low heat conductivity to reduce or prevent the flow of heat between highly conductive materials.
	Threshold This is a frame component on a swing door designed to act as a barrier to external elements.
	Tilt latch A tilt latch is a mechanism at the end of a window checkrail that allows a sash to release from the jamb liners and tilt into the structure.
	Tilt Window A double-hung window designed in such a way that the sashes tilt inward for easy cleaning of the outside of the glass.
	Timberstrand™ core This laminated core material is used in patio door stiles to prevent warping and movement.
	Tinted glass This glass has a subtle coloring (usually grey, bronze or green) that protects a home’s interior harsh direct sunlight.
	Tongue-and-Groove Joint A joint formed by the insertion of the tongue of one wood member into the groove of the other; modifications include tongue and groove rabbet joint, dado tongue and rabbet, tongued shoulder joint, dado and rabbet joint, dado and rabbet joint, dado and lip joint.
	Top Rail The top rail of a sash, door, blind or other similar panel assembly.
	Top slider See bottom slider.
	Transom A window, usually rectangular, placed over a door or window. Transoms, or fanlites, were first used in the 18th century on exterior doors. They increased the amount of light let into the front hall, and because of them, the size of the front door could be reduced.
	Trapezoid This is a four-sided geometric shape available for a vinyl or aluminum picture window frame bar.
	Triangle This is a three-sided geometric shape available for a vinyl or aluminum picture window frame bar.
	Trim Millwork, primarily mouldings, that finishes off window and door openings, fireplaces, walls and other members.
	Triple Glazing Three panes of glass with an airspace between each pane.
	True Divided Lite A window opening comprised of multiple individual smaller panes of glass separated by muntins.
	True radius top See round-top.
	TUV See fading.
	Twins This is a window or door with two openings.
	Two-vent slider This refers to a vinyl horizontal slider where the center lite is usually equal to the width of both vents together, most commonly in a 1/4, 1/2, 1/4 configuration. It may also be available in a equal configuration, 1/3-1/3-1/3. This is typically called out as an XOX.
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