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Accessory Structure

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.

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Acoustical Plaster

Calcined gypsum mixed with lightweight aggregates.

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Acoustical Glass

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

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Acoustical Ceiling

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

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Accessory

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

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Accessory Building

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

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Accessories

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).

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Accessible, Readily

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

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Abacus

Flat portion on top of a capital.

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Absorption

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

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AASHTO (American Association of State Highway and Transportation Officials)

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

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Absporptivity

The relative ability to absorb sound and light.

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Acanthus

A motif derived from the large leaf of the low-growing acanthus plant. Used at an early date by the Greeks for architectural scrolls on the capitals of the Corinthian column.

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Access Panel

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.

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Abrasion Resistance (AC Rating)

- Also referred to as the wear rating, it is the European Standard AC Rating. The range runs from the least resistant rating of AC1 To AC5, the most resistant to abrasion.

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A/C Disconnect

- The main electrical ON-OFF switch near the A/C Condenser.

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Access Flooring

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