The primary ingredient in these shingles is asphalt. The shingle is normally between 12" to 36" with cutouts on the bottom, which is the part that will be exposed to weather conditions. Exterior surface coat is made with mineral granules as protection from sunlight and weather. 80% of roofing shingles used are either asphalt or fiberglass because they wear well and are easy to install as well as being attractive in appearance.
Asphalt shingles
Composition roof shingles made from asphalt-impregnated felt covered with mineral granules.
Asphaltic plastic cement
Also referred to as flashing cement, this asphalt-based roofing cement remains pliable at colder temperatures.
Asphaltum
Normally used as a waterproofing agent, asphaltum is a very thin asphalt compound.
Aspirate
Removal of fluid or other matter through suction.
Aspiration
The result of mixing air with discharging water for the purpose of enhancing the hydro-massage effect of the whirlpool.
Aspirator
The apparatus used for removing air, fluids, etc. by suction.
Assay
Means of determining, by analysis, quantities of metals in ore samples.
Assemblage
The combing of several adjoining lots to increase total value.
