Flooring terminology encompasses numerous specialized words used by contractors, installers, and interior designers to describe materials and installation techniques. Common terms include subfloor, which refers to the structural plywood or concrete base beneath the finished surface; underlayment, a thin cushioning or moisture barrier layer placed under flooring; tongue and groove, a locking edge profile used on planks; expansion gap, the necessary space left around room perimeters to accommodate natural wood movement; and coefficient of friction, a measure of slip resistance used when evaluating tile safety in wet environments.
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