Oriented strand board (OSB) OSB Grading Guide Design and Application Guide Part 1
Oriented strand board (OSB) is commonly used as the primary structural sheathing component in residential construction and low rise commercial applications. OSB panel products give engineers, designers, specifiers and builders a broad array of choices for use as subfloors, combination floors, wall and roof sheathing. Besides the very important function of supporting and transferring loads to the building foundation, OSB panels provide an excellent base for many types of finished flooring and provide a flat, solid base upon which the exterior wall cladding and roofing can be applied. Performance criteria for specific construction applications for panels used in the United States, including OSB panels, are set out in the U.S. Department of Commerce/National Institute of Standards and Technology Voluntary Product Standard PS 2, Performance Standard for Wood-Based Structural-Use Panels. Panels conforming to this standard are identified with a gradestamp that includes the grade, recommended span rating(s) and bond classification for the panel, as well as the trademark of the third-party certification and testing agency with whom the panel was qualified. Once qualified, it is the manufacturer’s responsibility to maintain a quality control system that will assure that the gradestamp is applied only to those panels that meet the requirements of PS 2. This TECO Design and Application Guide is divided into four sections. Section 1 identifies some of the basics in selecting, handling, and storing OSB. Section 2 provides specific details regarding the application of OSB in single or multilayer floor systems, while Section 3 provides similar information for OSB used as wall and roof sheathing. Section 4 provides information on various performance issues concerning OSB. The information provided in this guide is based on standard industry practice. Users of structural-use panels should always consult the local building code and information provided by the panel manufacturer for more specific requirements and recommendations.
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