Substrate A material used below an exposed material such as a built-up roof is installed over a layer of felt paper. The felt paper is a substrate.
Subterranean A term used to indicate that something is installed below the surface of the soil. A foundation is usually releveled with subterranean piers.
Suction side filter dryer A filter dryer installed in the return refrigerant line of an air conditioning system. The dryer is used to neutralize acids
Surewall (fiberglass wall) A trade name for a stucco like siding that is applied like stucco. Surewall has fiberglass fibers embedded in it for increased strength.
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