Fiber-cement underlayment shall conform to ASTM C1288 or ISO 8336, Category C.Fasteners attaching wood structural panel roof sheathing to gable end wall framing shall be installed using the spacing listed for panel edges. Specified alternate attachments for roof sheathing shall be permitted where the ultimate design wind speed is less than 130 mph.Hardboard underlayment shall conform to CPA/ANSI A135.4.For 5-ply panels, intermediate nails shall be spaced not more than 12 inches on center each way.Fasteners shall be placed in a grid pattern throughout the body of the panel.Nails or staples shall be spaced at not more than 12 inches on center at intermediate supports for floors. Nails or staples shall be spaced at not more than 6 inches on center at all supports where spans are 48 inches or greater.Staples shall have a minimum crown width of 7/ 16-inch on diameter except as noted.Nail is a general description and shall be permitted to be T-head, modified round head or round head. RSRS-01 is a Roof Sheathing Ring Shank nail meeting the specifications in ASTM F1667.The toe nail on the opposite side of the rafter shall not be required. Where a rafter is fastened to an adjacent parallel ceiling joist in accordance with this schedule, provide two toe nails on one side of the rafter and toe nails from the ceiling joist to top plate in accordance with this schedule.Floor perimeter shall be supported by framing members or solid blocking. Blocking of roof or floor sheathing panel edges perpendicular to the framing members need not be provided except as required by other provisions of this code. Spacing of fasteners on roof sheathing panel edges applies to panel edges supported by framing members and required blocking. Spacing of fasteners on floor sheathing panel edges applies to panel edges supported by framing members and required blocking and at floor perimeters only.Fiberboard sheathing shall conform to ASTM C208. Gypsum sheathing shall conform to ASTM C1396 and shall be installed in accordance with GA 253.For wood structural panel roof sheathing attached to gable end roof framing and to intermediate supports within 48 inches of roof edges and ridges, nails shall be spaced at 6 inches on center where the ultimate design wind speed is less than 130 mph and shall be spaced 4 inches on center where the ultimate design wind speed is 130 mph or greater but less than 140 mph.Spacing of fasteners not included in this table shall be based on Table R602.3(2).Four-foot by 8-foot or 4-foot by 9-foot panels shall be applied vertically.Nails shall be spaced at not more than 6 inches on center at all supports where spans are 48 inches or greater.Staples are 16 gage wire and have a minimum 7/ 16-inch on diameter crown width.Nails used for framing and sheathing connections shall have minimum average bending yield strengths as shown: 80 ksi for shank diameter of 0.192 inch (20d common nail), 90 ksi for shank diameters larger than 0.142 inch but not larger than 0.177 inch, and 100 ksi for shank diameters of 0.142 inch or less. Nails are smooth-common, box or deformed shanks except where otherwise stated.
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