The governing standard is ANSI/APA PRG 320, Standard for Performance-Rated Cross-Laminated Timber. Therefore, option A is correct. The 2021 IBC requires structural glued cross-laminated timber to be manufactured and identified in accordance with PRG 320, and Type IV provisions require CLT to bear a label demonstrating conformity with that standard.
PRG 320 addresses essential manufacturing and qualification requirements, including panel construction, layup, structural performance, adhesive qualification, dimensional tolerances, product marking and quality assurance. Product identification is particularly important to the special inspector because visual similarity alone does not establish that a panel is code compliant.
DOC PS 2 applies primarily to wood structural panels such as plywood and oriented strand board and is not the manufacturing standard for CLT. ANSI/AITC or ANSI/APA A190.1 applies to structural glued-laminated timber, commonly called glulam. ASTM D5055 covers the establishment and monitoring of structural capacities for prefabricated wood I-joists.
The inspector should verify that CLT panels retain legible identification and that the manufacturer, grade, layup and panel designation correspond to the approved construction documents.
References/Topics: 2021 IBC Sections 602.4 and 2303.1.4; Chapter 35; ANSI/APA PRG 320-2019.
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