Click on the links to download the following new and updated publications.
New Standard for Cross-Laminated Timber
Approved by ANSI
ANSI/APA PRG 320-2011
Standard for
Performance-Rated Cross-Laminated Timber
A new standard for cross-laminated timber (CLT) was approved for publication last month by the American National Standards Institute (ANSI). Cross-laminated timber is a prefabricated solid engineered wood panel made from at least three layers of solid-sawn lumber or structural composite lumber (SCL) that are stacked cross-wise and bonded together with structural adhesives to form a solid, rectangular-shaped panel that is intended for construction applications, including roofs, floors and walls in residential and non-residential buildings.
ANSI/APA PRG 320 provides requirements and test methods for qualification and quality assurance of CLT. The standard includes seven stress classes covering major wood species in North America.
The 29-page brochure, ANSI/APA PRG 320-2011: Standard for Performance-Rated Cross-Laminated Timber, Form PRG 320 is available as a free downloadable PDF from APA's Publication Library.
Additional information is also availalbe in APA's News section.
Additional Standards Information
Updated Technical Topics
APA's Technical Topics provide recommendations and explanations for a variety of design and construction details. The following publications have recently been updated and are available only as free downloadable PDFs.
- Technical Topics: Power-Driven Fastener Considerations, Form TT-056
Discusses some common issues encountered when using power-driven fasteners. - Technical Topics: Woodpecker Damage to Wood, Form TT-067
Discusses possible methods for discouraging woodpeckers. -
Technical Topic: Requirements for Wall Coverings and Wind Pressures, Form TT-105
Reason for International Residential Code wall sheathing requirements with regard to wind pressure.
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