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ANSI/APA PRG 320-2025 Standard for Performance-Rated Cross-Laminated Timber

The ANSI/APA PRG 320-2025 Standard for Performance Rated Cross-Laminated Timber provides requirements and test methods for qualification and quality assurance for performance rated cross-laminated timber (CLT), which is manufactured from solid-sawn lumber or structural composite lumber (SCL) intended for use in construction applications. Product performance classes are also specified in the standard.

This publication is designed for: CLT manufacturers, engineers, designers, code officials

This standard provides requirements for CLT dimensions and tolerances, performance, test methods, quality assurance, and marking for CLT panels and their components. 

Key sections include:

  • Panel dimensions and dimensional tolerances

  • Component requirements

  • CLT performance criteria

  • Qualification and product marking

  • Quality assurance

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