Plywood Roof Sheathing Span Rating

Uniform loads psf on unsanded span rated plywood panels multi span normal duration of load dry conditions face grain parallel to supports span load face grain across supports span center to center rating governed span center to center of supports inches of supports inches by 12 16 19 2 24 30 32 36 40 48 60 12 16 24 l 360 92 37 21 10 8 3.

Plywood roof sheathing span rating.

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. 2 4 common performance categories and corresponding span ratings performance category span rating 3 8 24 0 7 16 24 16. Commonly square edge but may be produced with tongue and groove edges. Panels and lap siding bearing a span rating of 24 oc may be used direct to studs 24 inches on center.

Uniform loads psf on apa rated plywood sheathing. Apa rated sheathing panels are produced as plywood or oriented strand board osb. All rated siding panels may be applied horizontally direct to studs 16 or 24 inches on center provided horizontal joints are blocked. Panels are available that carry apa series mobile home roof sheathing rating n 216r.

Allowable load at maximum span. 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. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. 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.

Panels and lap siding with a span rating of 16 oc may be applied direct to studs spaced 16 inches on center. Loads will vary with the pitch of the roof. 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.