Calcined gypsum mixed with lightweight aggregates.

In one- and two-family dwellings not more than three stories high with separate means of egress, a building, the use of which is incidental to that of the main building and which is located on the same lot.

A glazing unit used to reduce the transmission of sound through the glazed opening by bonding a soft interlayer between the layers of glass.

A ceiling of fibrous tiles that are highly absorbent of sound energy.

Signifies access without the necessity for removing a panel or similar obstruction.

Are extra items that can be furnished in addition to the base joist or joist girder. They include: headers, top chord extensions, extended ends, ceiling extensions, bottom chord extensions, sloped end bearings, bridging, bridging anchors, joist girder bottom chord bracing, or angle units (joist substitutes).

A building or structure on the same lot as the main or principal building.

A building product which supplements a basic solid panel building such as a door, window, light transmitting panel, roof vent, etc.

Removable metal or concrete floor panels about 18" to 24" square which are supported on short steel pedestals so that wiring and ductwork may be installed, changed and maintained below the floor. The raised floor may be carpeted or tiled to create a finished floor surface.

A raised finish floor surface consisting entirely of small, individually removable panels beneath which wiring, ductwork, and other services may be installed.

A surface divider joint designed to allow free movement between new and existing construction or between different materials.

The process by which a liquid or mixture of liquid and gases is drawn into the pores of a porous solid material.

A small metal or wood door flush with a wall or ceiling surface which provides a closure over a valve or other operable device which is recessed into the wall or located above a ceiling. The access door may be keyed and lockable.

The relative ability to absorb sound and light.

Signifies access that requires the removal of an access panel or similar removable obstruction.

A regulatory organization which governs the design and specifications of highway bridges.

- The outside fan unit of the Air Conditioning system. It removes the heat from the freon gas and "turns" the gas back into a liquid and pumps the liquid back to the coil in the furnace.

Right of an owner to have ingress and egress to and from a property.

The wall in a room which has been given special design emphasis to attract attention from the adjacent walls.

- A pattern or design not based on natural forms.