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2.0 Description. APA Rated Sheathing is rated for use as subfloor, wall, roof, diaphragm and shear wall sheathing. It is suitable for use in a range of construction and miscellaneous applications where strength and stiffness are required.
To qualify for a given Span Rating under the standards, a panel must meet all of the criteria for that rating. As a result, mechanical properties that are characteristic of APA structural-use panels are actually greater than the minimum necessary to pass one criterion.
For each combination of span and thickness (or Span Rating), loads are given for deflections of L/360, L/240 and L/180, and maximum loads controlled by bend-ing and shear capacity. Uniform loads for some applications can be read directly from the tables.
A panel marked 32/16, for example, may be used for roof decking over supports up to 32 inches on center or for subflooring over supports up to 16 inches on center. The Span Rating on APA RATED STURD-I-FLOOR and APA RATED SIDING panels appears as a single number.
for strength axis perpendicular to supports, 3-span conditions are considered for spans of 32" or less and 2-span conditions are considered for spans greater than 32".
Panels are assigned a Span Rating, which is primarily a mea- sure of panel stiffness and strength paral- lel to the major panel strength axis (usually the long dimension). It consists of two numbers presented in a manner similar to a fraction, e.g. 32/16.
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.
