The APA EWS Performance-Rated I-joist is an "I" –shaped prefabricated structural member using sawn or structural composite lumber flanges and structural-use panel webs boded together with exterior adhesives.

This standard provides design properties for APA EWS Performance-Rated I-joists in sizes that are commonly used in non-residential floor and roof construction. To qualify for trademarking as an APA EWS Performance Rated I-joist, the I-joist shall demonstrate conformance to requirements set forth in this standard.

APA EWS Performance-Rated I-joists are intended for use in dry-service conditions where the average equilibrium moisture content of sawn lumber is less than 16%.

Products carrying the APA EWS Performance-Rated I-joist trademark are to be installed in accordance with recommendation published by APA