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Term Definition
As-Built Drawings. See Record Drawings.  
As-Builts. See Record Drawings.  
ASCE. American Society of Civil Engineers.  
Aseismic Region. A region that is relatively free of earthquakes.  
Ash Dump. A metal access door in the floor of a fireplace firebox to dump the ashes into the ash pit below.  
Ash Pit. The compartment below a fireplace in which ashes may be dumped from the firebox and stored for later removal.  
Ashlar Veneer. An ornamental or protective facing of masonry composed of squared stones.  
Ashlar. A pattern of masonry consisting of squared stones.  
ASHRAE. American Society of Heating, Refrigeration, and Air-Conditioning Engineers, Inc.  
Askarael. A synthetic nonflammable insulating liquid which, when decomposed by the electric arc, evolves only nonflammable gaseous mixtures.  
ASLA. American Society of Landscape Architects.  
ASME. American Society of Mechanical Engineers.  
ASME Boiler Code. Standard specifications issued by the American Society of Mechanical Engineers for the construction of boilers.  
ASPE. American Society of Plumbing Engineers.  
Aspect Ratio. Ratio of length to width of a rectangular air grille or duct.  
Asphalt Cement. A fluxed or unfluxed asphalt specially prepared as to quality and consistency for direct use in the manufacture of asphalt pavements.  
Asphalt Curb. An extruded berm made from asphaltic concrete.  
Asphalt Cut Back. Asphalt plus thinner; asphalt solution; asphalt coating formed by dissolving asphalt.  
Asphalt Dampproofing. The application of asphalt to act as a water-resisting treatment to the surface of a concrete or masonry wall.  
Asphalt Demolition. The destruction of roadways constructed of asphalt using large wheeled machinery that tears up the old asphalt into manageable pieces for easy removal.  
Asphalt Emulsion. Asphalt dispersion; not a solution; a water emulsion of asphalt.  
Asphalt Expansion Joint. Felt or fiberboard premolded and impregnated with asphalt and used as an expansion joint for cast-in-place concrete.  
Asphalt Institute (AI). 6917 Arlington Road #210, Bethesda, Maryland 20814, (301) 656-5824.  
Asphalt Leveling Course. A course asphalt aggregate mixture of variable thickness used to eliminate irregularities in the contour of an existing surface prior to a superimposed treatment or construction.  
Asphalt Mastic. A mixture of asphaltic material, mineral aggregates, and fine mineral aggregates that can be poured when heated but needs mechanical manipulation to apply when cool.  
Asphalt Membrane. A layer of asphalt used on a flat roof.  
Asphalt Felt. An asphalt-saturated felt or an asphalt-coated felt.  
Asphalt Prime Coat. A low viscosity liquid asphalt applied to prepare an untreated surface to penetrate into the voids, harden the top and help bind it to the overlying asphalt surface.  
Asphalt Repair. The act or process of patching worn road surfaces or leaking roofs.  
Asphalt Rock. Porous rock such as sandstone or limestone that has become impregnated with natural asphalt through geologic process; also called Rock Asphalt.  

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