Definitions of Terms under Alphabet T

An insulated glass assembly made of three thicknesses of glass, with air spaces between.

Trimmer Stud

In a wood-framed rough opening, the stud or framing member which runs vertically from the sub-floor to the structural header member, into which a door frame is fastened.


A framed glass assembly mounted atop a door assembly.


Another term for sill. The horizontal part of a door assembly, fixed under the door panel and bearing on the floor.

Thermal Break

A feature of a door/frame assembly which separates metal or glass exposed to outside temperatures from coming into contact and transmitting heat to or from inside-exposed parts.


A pattern used to machine-cut a precise hole or recess into a door or frame part.

Tempered Glass

A glass sheet, which has been strengthened by heat processing.