Plywood Roof Sheathing Span Rating

Loads will vary with the pitch of the roof.

Plywood roof sheathing span rating.

All rated siding panels may be applied horizontally direct to studs 16 or 24 inches on center provided horizontal joints are blocked. Uniform loads psf on apa rated plywood sheathing. The span rating on apa rated sturd i floor underlayment and apa rated siding panels appears as a single number. Allowable load at maximum span.

Panels are available that carry apa series mobile home roof sheathing rating n 216r. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. 2 4 common performance categories and corresponding span ratings performance category span rating 3 8 24 0 7 16 24 16. Allowable uniform load based on deflection of 1 360 of span is 100 pounds per square foot except the span rating of 48 inches on center is based on a total load of 65 pounds per square foot.

The span ratings for apa rated sturd i floor and underlayment panels like those for apa rated sheathing are based on application of the panel with the long dimension or strength axis across three or more supports. Multi span normal duration of load dry conditions panels 24 inches or wider span rating b load governed by c strength axis a perpendicular to supports span center to center of supports inches parallel to supports span center to center of supports inches 12 16 19 2 24 30 32 36 40 48 60 12 16 24. Sheathing panels 3 8 category may be installed perpendicular or parallel to supports spaced a maximum of 16 o c and will support a 30 psf live load without exceeding a deflection limit of 1 180. Most roofs will be sheathed in plywood at least 3 8 inch thick.

Panels and lap siding bearing a span rating of 24 oc may be used direct to studs 24 inches on center. 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.