Microorganisms that may grow to colonies in damp environments, including certain rooftops. They can discolor shingles. Often described as "fungus.".
Algaecide
Normally in tablet form, placed in evaporator drain pan. Used to help slow the growth of bacteria.
Align-a-cut
The align-a-cut feature can be found on several table saw models. This feature aligns a mark on the workpiece with the cutting blade for quick, accurate cuts.
Alkali
Water-soluble mineral compound, usually a moderate strength base (as opposed to caustic hydroxide), such as a bicarbonate and carbonate compound when it is present in the water.
Alkaline soil
Soil that has a pH level of about 7.0 or more. Sometimes referred to as "sweet" soil.
Alkalinity
The measurement of constituents in a water supply which determine alkaline conditions. The alkalinity of water is a measure of its capacity to neutralize acids.
Alkyd
Synthetic resin modified with oil for good adhesion to a clean surface, and good gloss, color retention, and flexibility. Slow- drying.
Alkyl benzene sulfonate
Sulfonate A chemical compound formerly used as detergent. Sometimes called "hard" detergent, because of its resistance to biological degradation, largely replaced with linear alkyl sulfonate (LAS), which is more readily biodegradable.
Alligatoring
A characteristic of asphalt which occurs during the aging process in which the loss of volatile oils and the oxidation brought about by solar radiation produces a pattern of cracks which resemble an alligator hide, because of the limited tolerance to thermal expansion or contraction.
Allowable span
The distance between two supporting points for load bearing lumber such as joist, rafters or a girder.
