- Subfloor – The structural assembly the floorcovering is installed on.
- Sleeper-constructed subfloor – Consists of wood subfloor installed over or on an existing concrete subfloor without 18″ of well-ventilated air space.
- APA trademarked – Wood underlayments approved as suitable for the installation of flooring by APA–The Engineered Wood Association.
- STURD-I-FLOOR® – An APA-rated panel specially designed as combination subfloor/underlayment.
- Underlayment – Material used to prepare the subfloor for the installation of a floor covering. Wood panels and cement patches are common examples.
- Substrate – The surface of the subfloor that the floorcovering is installed on.
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