Plywood Roof Sheathing Maximum Span

A panel marked 32 16 may be used for roof sheathing over supports spaced up to 32 inches o c.

Plywood roof sheathing maximum span.

The tables do not apply directly to plywood having a single span. The values given in tables 1 and 2 represent the maximum allowable loads for plywood or osb. Panels and lap siding bearing a span rating of 24 oc may be used direct to studs 24 inches on center. For face grain parallel to supports tables are based on three spans for spans of 16 and less and two spans for 24.

For 1 2 inch panel maximum span shall be 24 inches. So dividing the area of the roof by 32 will give you the number of sheets needed. 1 500 32 46 875 sheets. Panels and lap siding with a span rating of 16 oc may be applied direct to studs spaced 16 inches on center.

The span rating on sheathing span panels appears as two numbers separated by a slash e g 32 16 or 48 24. Produced by apa the engineered wood association formerly the american plywood association in 1989. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. For sanded plywood panels see table 3.

Support spacing when the panel is used for subflooring. A 4 8 sheet of plywood is 32 ft 2. Tables 2a through 2c apply to apa rated osb sheathing apa rated osb structural i sheathing and apa rated osb sturd i floor respectively. Loads will vary with the pitch of the roof.

All rated siding panels may be applied horizontally direct to studs 16 or 24 inches on center provided horizontal joints are blocked. This video may depict some work practices that do not meet current safety standards. For example if your roof is 1 500 ft 2 then it will take 47 sheets of plywood to sheath it. Most roofs will be sheathed in plywood at least 3 8 inch thick.

Use the two span condition for support spacing greater than 16 inches but no greater than 24 inches on center. Always ensure your work site is compliant with current osha regulations. Span is permitted to be 24 inches on center where 3 4 inch wood strip flooring is installed at right angles to joist. The second number is the maximum o c.

Span is permitted to be 24 inches on center for floors where 1 1 2 inches of cellular or lightweight concrete is applied over the panels. Avoid roof complaints with proper framing sheathing and roofing techniques. Table 1d applies to apa rated plywood structural i sturd i floor.