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R618.104.22.168 Floor and Roof Diaphragm Construction Requirements in Seismic Design Categories D0, D1 and D2
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The requirements of this section shall apply in addition to those required by Section R611.8.3. Edge spacing of fasteners in floor and roof sheathing shall be 4 inches (102 mm) on center for Seismic Design Category D0 or D1 and 3 inches (76 mm) on center for Seismic Design Category D2. In Seismic Design Categories D0, D1 and D2, all sheathing edges shall be attached to framing or blocking. Minimum sheathing fastener size shall be 0.113 inch (3 mm) diameter with a minimum penetration of 13/8-inches (35 mm) into framing members supporting the sheathing. Minimum wood structural panel thickness shall be 7/16 inch (11 mm) for roof sheathing and 23/32 inch (18 mm) for floor sheathing. Vertical offsets in floor framing shall not be permitted.