The values given in tables 1 and 2 represent the maximum allowable loads for plywood or osb.
Roof sheathing tables.
The tables permit a bearing length of up to 3 5 inches but since 1 5 is probably the worst case that you ll encounter for joist or rafter bearing it s a safe value.
For example if the roof pitch is 45 then sec 45 1.
For sanded plywood panels see table 3.
If you know the roof pitch in degrees find the secant of the slope using a scientific calculator.
The loads are based on adjusted roof snow loads from the governing building code.
Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.
A strong resilient roof is a home s first line of defense when the roof deck is exposed to weather.
The maximum allowable spans for wood structural panel roof sheathing shall not exceed the values set forth in table r503 2 1 1 1 or apa e30.
Example use of load span tables roof application.
Table 1d applies to apa rated plywood structural i sturd i floor.
Zip system roof assembly combines our revolutionary integrated sheathing and flashing tape or liquid flashing to provide a sealed roof for protection against moisture intrusion during construction or if high winds strip the roof covering away.
Avoid roof complaints with proper framing sheathing and roofing techniques.
8d ring shank nails should be used instead.
Always ensure your work site is compliant with current osha regulations.
Tables 2a through 2c apply to apa rated osb sheathing apa rated osb structural i sheathing and apa rated osb sturd i floor respectively.
For roof live loads less than 20 pounds per square foot psf rafter spans and required e values tabulated for 20 psf shall be permitted to be adjusted in accordance with the fol lowing table.
For a more detailed explanation of the roof pitch multiplier see how to find the area of a sloped roof.
Never attach roof sheathing with staples.
Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively.
Sheathing should be a minimum of 19 32 inch thick.
Produced by apa the engineered wood association formerly the american plywood association in 1989.
R803 2 3 installation wood structural panel used as roof sheathing shall be installed with joints staggered in accordance with section r803 2 3 1 for wood roof framing or with table r804 3 for cold formed steel roof framing.
For roof live loads of 12 psf or 16 psf.
This video may depict some work practices that do not meet current safety standards.
Determine allowable uniform live load and total load for 1 2 structural 1 sheathing 32 16 advantech vip for application in a roof system subject to snow loads.
Table 9 1 in span tables for joists and rafters figure 5 gives a required compression value of 237 psi for a span of 16 feet and bearing length of 1 5 inches.
The primary axis is applied perpendicular to roof trusses spaced 24 inches on center.
The typical thickness range for sheathing is 3 8 to 3 4 inch.
Table 2304 7 2 sheathing lumber minimum grade requirements.
