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R803.1 Lumber Sheathing
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Allowable spans for lumber used as roof sheathing shall conform to Table R803.1. Spaced lumber sheathing for wood shingle and shake roofing shall conform to the requirements of Sections R905.7 and R905.8. Spaced lumber sheathing is not allowed in Seismic Design Category D2.
MINIMUM THICKNESS OF LUMBER ROOF SHEATHING
|RAFTER OR BEAM SPACING |
|MINIMUM NET THICKNESS |
|48a||11/2 T & G|
For SI: 1 inch = 25.4 mm.
- Minimum 270 Fb, 340,000 E.
- Minimum 420 Fb, 660,000 E.
- Minimum 600Fb, 1,150,000 E.
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