Information provides guidance for engineers and designers with attention to questions on the physical properties of plywood and their application in extreme conditions. Revised November 2008.

Discusses minimum nail penetration required to develop full connection capacity. Revised September 30, 2017.

Describes the use of portal-frame design in engineered applications, as well as its use as bracing in conventional light-frame construction. Revised May 2020.

Results of bearing tests conducted on plywood and OSB specimens of different thicknesses sampled from various mills by APA. Revised May 2020.

Provides guidance on lateral bracing recommendations for wood bending members having varying depth-to-width ratios and a brief history of testing. Revised May 2020.

If radiant (hydronic) underfloor heat systems are improperly designed, installed, or operated, they can have adverse impacts upon wood I-joist floor framing. This Tech Topic addresses prevention of such problems. Revised September 2014.

Discussion and recommendation for foam plastic roof insulation over minimum Performance Category 15/32 engineered wood panels that meet the 15-minute thermal barrier requirement. Revised August 1, 2012.

APA-trademarked panel recommendations for trench-shoring design. Revised March 11, 2016, 4 pages.

Minimum application recommendations for design and specification of columns, girts, blocking and framing connections of panel siding on post frame structures. Issued January 6, 2013.

Recommends three methods for the installation of a wood floor system over a concrete slab: sleepers, rigid foam or direct. Revised February 10, 2017.