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For roof decking consisting of wood structural panels, fasteners and spacings required in Table C202.1.2 shall be deemed to comply with the requirements of Section 707.3 of the International Existing Building Code.
Supplemental fasteners as required by Table C202.1.2 shall be 8d ring shank nails with round heads and the following minimum dimensions:
  1. 0.113-inch-nominal (3 mm) shank diameter.
  2. Ring diameter not less than 0.012 inch (0.3 mm) greater than shank diameter.
  3. 16 to 20 rings per inch.
  4. A minimum 0.280-inch (7 mm) full round head diameter.
  5. Ring shank to extend not less than 11/2 inches (38 mm) from the tip of the nail.
  6. Minimum 21/4-inch (57 mm) nail length.
SUPPLEMENT FASTENERS AT PANEL EDGES AND INTERMEDIATE FRAMING
EXISTING FASTENERS EXISTING FASTENER
SPACING (EDGE OR
INTERMEDIATE SUPPORTS)
MAXIMUM SUPPLEMENTAL
FASTENER SPACING
FOR 130 MPH < Vult 140 MPH
MAXIMUM SUPPLEMENTAL
FASTENER SPACING FOR
INTERIOR ZONEc
LOCATIONS FOR MPH
Vult > 140 MPH AND
EDGE ZONES NOT COVERED
BY THE COLUMN
TO THE RIGHT
EDGE ZONEd FOR Vult > 160 MPH
AND EXPOSURE C, OR
Vult > 180 MPH AND
EXPOSURE B
Staples or 6d Any 6" o.c.b 6" o.c.b 4" o.c.b at panel edges and 4" o.c.b at intermediate supports
8d clipped head or round head smooth shank 6" o.c. or less None necessary None necessary along edges of panels but 6" o.c.b at intermediate supports of panel 4" o.c.a at panel edges and 4" o.c.a at intermediate supports
8d clipped head or round head ring shank 6" o.c. or less None necessary None necessary 4" o.c.a at panel edges and 4" o.c.a at intermediate supports
8d clipped head or round head smooth shank Greater than 6" o.c. 6" o.c.a 6" o.c.a along panel edges and 6" o.c.b at intermediate supports of panel 4" o.c.a at panel edges and 4" o.c.a at intermediate supports
8d clipped head or round head ring shank Greater than 6" o.c. 6" o.c.a 6" o.c.a 4" o.c.a at panel edges and 4" o.c.a at intermediate supports
For SI: 1 inch = 25.4 mm; 1 foot = 304.8 mm; 1 mile per hour = 0.447 m/s.
  1. Maximum spacing determined based on existing fasteners and supplemental fasteners.
  2. Maximum spacing determined based on supplemental fasteners only.
  3. Interior zone = sheathing that is not located within 4 feet of the perimeter edge of the roof or within 4 feet of each side of a ridge.
  4. Edge zone = sheathing that is located within 4 feet of the perimeter edge of the roof and within 4 feet of each side of a ridge.

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