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ACIL: American Council of Independent Laboratories Acrylic Coating: A coating system with an acrylic resin base. Acrylic Resin: Polymers of acrylic or methacrylic monomers often used as a latex base for coating systems. Active: Will corrode in the presence of moisture or a "noble" metal. Adhere: The clinging of one surface to another; either molecularly or otherwise. Adhesion: The state of adhering AFA: American Fiberboard Association AGC: Associated General Contractors of America Aggregate: A surfacing or ballast for a roof system. Aggregate can be rock, stone, crushed stone or slag, water-worn gravel, crushed lava rock or marble chips. AHA: American Hardboard Association AIA: American Institute of Architects Air Blown Asphalt: Asphalt produced by blowing air through molten asphalt held at an elevated temperature. This procedure is used to modify properties of the asphalt. Alligatoring: The cracking of the surfacing bitumen on a built-up roof, producing a pattern of cracks that resemble an alligator’s hide. <picture> Aluminized Steel: Sheet steel with a thin aluminum coating on the surface to enhance the steel’s ability to withstand weathering. Aluminum: A non-rusting metal used in roofing for metal roofing and the fabrication of gutter and flashings. Ambient Temperature: The temperature of the air. Anodic: When two metals are connected in an electrolyte, they will form a galvanic cell, with the higher metal in the galvanic series being the anode. The anodic will oxidize and produce an electrical current which protects the cathode from corrosion. ANSI: American National Standards Institute APA: American Plywood Association APP: See Atactic Polypropylene. Application Rate: The rate at which a material is applied per unit area. Apron Flashing: A flashing located at the low end of a curb or penetration. Architectural Panel: A metal roof panel that usually requires solid decking underneath. Architectural Shingle: Shingle that provides a dimensional appearance. See also Dimensional Shingle. Area Divider: A flashed assembly usually extending above the surface of the roof that is anchored to the roof deck. It is used to relieve thermal stresses in a roof system where an expansion joint is not required, or to separate large roof areas. ARMA: Asphalt Roofing Manufacturers Association ASA: American Subcontractors Association Asbestos: An incombustible fibrous mineral form of magnesium silicate formerly used for fireproofing and sometimes used for the reinforcement of roofing materials. ASC: Associated Specialty Contractors ASHI: American Society of Home Inspectors ASHRAE: American Society of Heating, Refrigerating & Air-Conditioning Engineers, Inc. Asphalt: A substance left as a residue after evaporating or otherwise processing crude oil or petroleum. Asphalt can be refined to conform to various roofing grade specifications:
Asphalt Emulsion: A mixture of asphalt particles and an emulsifying agent such as bentonite clay and water. Asphalt Felt: An asphalt-saturated and/or an asphalt-coated felt membrane. (See also Felt.) Asphalt Primer: See Primer. Asphalt Roof Cement: The proper name for Plastic Cement and Flashing Cement. Asphalt roof cement consists of solvent-based bitumen, mineral stabilizers, and other fibers (sometimes asbestos). Asphalt roof cement is categorized by ASTM standard D 2822-91 (1997) or for non-asbestos, ASTM standard D 4586-93.
ASTM: American Society for Testing and Materials Atactic Polypropylene: A group of high molecular weight polymers formed by the polymerization of propylene. Attic: The open area above the ceiling and under the roof deck of a steep-sloped roof. AWPA: American Wood Preservatives Association AWS: American Welding Society |
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