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There are three possible span conditions to consider when computing the uniform load capacities of structural-use panels depending on the size and orientation of the panel and the spacing of the framing support members. These include single-span, two-span and three-span (see below).
ALLOWABLE UNIFORM LOAD CAPACITY (PSF) ON SHEATHING. The attached information is based upon recognized industry standards, testing and quality control procedures. The information is provided for information purposes. For project specific application, a design professional should be consulted. SPAN RATING.
Oriented Strand Board. This guide details a full range of OSB products along with technical data for all specifications. Hanson Plywood Limited 2020. OSB/3. OSB3 is a highly engineered, moisture resistant, load-bearing panel designed for use in humid conditions and is therefore ideal for many structural and non-structural applications.
Span Rating on APA Trademarked OSB Panels. The Span Rating denotes the maximum permitted centre to centre spacing of supports. It is particularly important for Rated Sheathing and Rated Sturd-I-Floor when the long panel dimension or strength axis is across two or more supports.
APA Rated Sheathing panels are produced as plywood or oriented strand board (OSB). Typical size is 4 ft x 8 ft, but other sizes may also be produced. Commonly square edge, but may be produced with tongue and groove edges. 2.4 Common Performance Categories And Corresponding Span Ratings. 3.0 Installation.
The standard classi-fies panels by bond classification, span rating, performance category and grade. It provides test methods, a glossary of trade terms and definitions, and a quality certification program whereby agencies inspect, sample, and test products for conformance to this standard.
OSB Information Sheet. Classification: Exposure 1 - OSB Suitable for uses not permanently exposed to the weather. Panels classified as Exposure 1 are intended to resist the effects of moisture on structural performance as may occur due to construction delays, or other conditions of similar severity.
