The construction systems described in this brochure are based on designs using APA structural wood panels. APA trademarked panels conform to standards based on either the panel's intended end use, or the way the panel is manufactured. Some panels meet the requirements of both standards.


Performance standards set requirements based on a panel's end use, while manufacturing standards prescribe minimum manufacturing requirements. The performance standard employed by APA is called PRP-108, Performance Standards and Policies for Structural-Use Panels. PRP-108 sets standards for uniform, concentrated and impact load capacities,fastener-holding ability, racking resistance, dimensional stability, and bond durability. in addition to conventional veneered plywood, APA performance standards encompass such other structural panel products as composites and oriented strand board (OSB). Panels conforming to the performance standard are referred to as APA Rated Sheathing, APA Rated Sturd-I-Floor or APA Rated Siding.


The manufacturing standard employed by APA is called U.S. Product Standard PS 1-83 for Construction and Industrial Plywood. This voluntary standard was developed cooperatively by the U.S. Department of Commerce and the construction and industrial plywood industry. PS 1-83 establishes requirements for producing, marketing and specifying construction and industrial plywood.


APA panels possess a unique combination of characteristics that make them an invaluable material in seismic design applications.

STRENGTH - APA panels resist racking, or in-plane shape distortion. Because of their resistance to splits they have excellent fastener-holding capabilities and can be nailed very near panel edges. Relative to their strength, structural wood panels are lightweight and easy to handle, work and install.

STIFFNESS - APA panels resist deflection when confronted with the movement and shifting forces of an earthquake That means buildings with structural wood panel roofs, walls and floors are less likely to collapse during an earthquake.

IMPACT RESISTANCE - APA panels improve upon wood's well-known ability to absorb shock. Their construction and large size distributes impact loads.

WORKABILITY - APA panels can be worked with ordinary tools and basic carpentry skills. They can be cut, routed, jointed, drilled, glued and fastened. Panels also can be bent to form curved surfaces without losing strength. For more information on performance standards and grade designations ask for the APA Product Guide: Grades and Specifications, [Form J2O].

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