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Hardwood flooring has two types mainly solid and engineered. Solid hardwoods are typically 3/4" or 19mm thick, although some do come in 3/8" (10mm) or 5/16" (8mm) thicknesses. This type of hardwood flooring can be installed with a nail-down installation method over wood subfloors. This type of hardwood is also very susceptible to the effects of moisture and temperature, because hardwoods expand and contract with moisture and temperature changes in the atmosphere. Engineered hardwood is referred to as being dimensionally stable. Solid hardwood does not have dimensional stability because all of the grain runs in the same direction. Because of its dimensional stability, engineered hardwood can be glued directly to concrete above or below grade, as opposed to solid hardwood, which cannot.
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