If you know the roof pitch in degrees find the secant of the slope using a scientific calculator.
Roof sheathing tables.
Always ensure your work site is compliant with current osha regulations.
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.
For sanded plywood panels see table 3.
For roof live loads of 12 psf or 16 psf.
Sheathing should be a minimum of 19 32 inch thick.
Table 2304 7 2 sheathing lumber minimum grade requirements.
8d ring shank nails should be used instead.
The loads are based on adjusted roof snow loads from the governing building code.
The values given in tables 1 and 2 represent the maximum allowable loads for plywood or osb.
Never attach roof sheathing with staples.
Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7.
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.
This video may depict some work practices that do not meet current safety standards.
Table 1d applies to apa rated plywood structural i sturd i floor.
Avoid roof complaints with proper framing sheathing and roofing techniques.
The following table provides the roof pitch multiplier for roofs of various slopes.
Tables 2a through 2c apply to apa rated osb sheathing apa rated osb structural i sheathing and apa rated osb sturd i floor respectively.
The typical thickness range for sheathing is 3 8 to 3 4 inch.
Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.
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.
The primary axis is applied perpendicular to roof trusses spaced 24 inches on center.
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.
Example use of load span tables roof application.
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.
Maximum 19 percent moisture content.
Produced by apa the engineered wood association formerly the american plywood association in 1989.
A strong resilient roof is a home s first line of defense when the roof deck is exposed to weather.
