Glossary T

Tear Drop-

A term given to mouldings with a gradual curved profile.

Tempered Glass-

Glass that is treated with heat in its manufacturing, creating a product that can withstand abnormal force or pressure on its surface, and which does not break into sharp pieces; code requires tempered glass in all doors (including patio doors) and on windows that are located near doors.

Tenon-

A projection tongue-like part of a wood member to be inserted into a slot (mortise) of another member to form a "mortise and tenon joint."

Thermal Break-

The addition of a thermal insulating material between two thermally conductive materials.

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.

Toned-

Moulding pre-finished by staining and top-coating.

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.

Torus-

LA large bead; opposite of scotia; rope like moulding.

Total Solar Energy-

The total solar spectrum composed of UV, Visible and Near Infrared wavelengths.

Transom-

A small opening above a door or window separated by a horizontal member that usually contains a sash or a louver panel hinged to the transom bar. Transoms, or fan lights, 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. They probably encouraged the Victorian use of stained glass for front doors.

Trim-

Millwork, primarily mouldings and/or trim to finish-off (trim around) windows and door openings, fire-places, walls and other members.

Door Trim-
Trim for a door opening usually consisting of casing.

Exterior Trim-
Trim used on the exterior of a structure.

Interior Trim-
Trim used on the interior of a structure; sometimes referred to as interior finish.

Running Trim-
Interior of exterior trim ordered in linear of lineal measurement and which extends for runs around the perimeter of a room or structure; as opposed to standing trim.

Window Trim-
The moulding and/or trim necessary to "finish" or "trim" a sash or window frame.

Trimbacks-

Odd lengths developed in the manufacture of cut-to-length finger jointed mouldings.

Trimming Out-

Installing "trim"; sometimes refers to interior finish.

Triple Glazing-

Three panes of glass with an air space between each pane.

True Divided Light-

Windows that contain individual panes of glass and are assembled in the sash using muntins.