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APA PRI-400 Performance Standard for Residential I-Joists Standards - PRI-400 This standard contains performance criteria, qualification requirements and quality assurance information for APA Performance Rated I-joists used in residential floors. APA PRI-400 Performance Standard for Residential I-Joists, Limit States Design for Canada Standards - PRI-400 CA This standard details performance criteria, qualification requirements and quality assurance for APA Performance Rated residential I-joists, limit states design, for use in Canada **Please note this image may have been edited or manipulated to enhance visually** APA PRI-405 Performance Standard for Commercial I-Joists Standards - PRI-405 This standard contains performance criteria, qualification requirements & quality assurance information for APA Performance Rated I-joists in commercial roof/floor construction.