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Building Design and Construction Handbook - Merritt - Ventech!

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10.38 SECTION TEN<br />

10.12.5 Availability of Panel Grades<br />

Some panel grades, thicknesses, span ratings, or species may be difficult to obtain<br />

in some areas. Check with your supplier for availability or include an alternative<br />

panel in specifications. St<strong>and</strong>ard panel dimensions are 4 � 8 ft, although some<br />

mills also produce plywood panels 9 or 10 ft long or longer. OSB panels may be<br />

ordered in lengths up to 24 ft in some market areas.<br />

10.12.6 APA Rated Sturd-I-Floor<br />

APA Rated Sturd-I-Floor (copyrighted name) is a span-rated product designed specifically<br />

for use in single-layer floor construction beneath carpet <strong>and</strong> pad. The maximum<br />

spacing of floor joists, or span rating, is stamped on each panel. Panels are<br />

manufactured with span ratings of 16, 20, 24, 32, <strong>and</strong> 48 in. These assume the<br />

panel continuous over two or more spans with the long dimension or strength axis<br />

across supports (Fig. 10.6). The span rating in the trademark applies when the long<br />

panel dimension is across supports unless the strength axis is otherwise identified.<br />

Glue-nailing is recommended, though panels may be nailed only. Application<br />

provisions for both methods are given in Table 10.18. Uniform live loads are given<br />

in the APA ‘‘<strong>Design</strong>/<strong>Construction</strong> Guide—Residential & Commercial.’’<br />

10.12.7 Panel Subflooring<br />

The limiting factor in design of floors is deflection under concentrated loads at<br />

panel edges. Nailing provisions for APA panel subflooring (Fig. 10.7) are given in<br />

Table 10.19. Other code-approved fasteners, however, may be used. The span ratings<br />

in Table 10.19 applied to Rated Sheathing or sheathing grades only <strong>and</strong> are<br />

the minimum for the span indicated. The span ratings assume panels continuous<br />

over two or more spans with the long dimension or strength axis across supports.<br />

FIGURE 10.6 Floor construction with APA Rated Sturd-I-Floor.

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