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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.
The Span Rating on APA RATED SHEATHING panels appears as two numbers separated by a slash, such as 32/16, 48/24, etc.(a) The left-hand number denotes the maximum recommended spacing of supports when the panel is used for roof sheathing with the long dimension or strength axis of the panel across three or more supports.
To qual ify 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 charac teristic of APA structural-use panels are actually greater than the mini mum necessary to pass one criterion.
Use the two-span condition for support spacing greater than 32 inches on center but no greater than 48 inches on center. When the panel strength axis is placed parallel to framing supports, the three-span condition is used for support spacing up to and including 16 inches on center.
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.
1. UNIFORM LOADS (PSF) ON APA RATED SHEATHING, MULTI-SPAN, NORMAL DURATION OF LOAD, DRY CONDITIONS, PANELS 24 INCHES OR WIDER. The strength axis is the long panel dimension unless otherwise identified. Nominal thickness may vary within Span Rating. For range of thicknesses, see Table 5 of. TABLE 2.
residential roofs. However, using fewer supports with thicker panels—e.g., Performance Category 23/32 panels with a span rating of 48/24 over framing 48 inches on center—is also cost effective for long-span flat or pitched roofs. Recommended live loads are given in Table 34. Nailing recommendations are given in Table 36.
