Roof Assemblies... length of roof nails

International Building Code, Chapter 15

Fasteners for asphalt shingles shall be galvanized steel, stainless steel,
aluminum or copper roofing nails, minimum 12 gage [0.105 inch (2.67 mm)]
shank with a minimum 3/8 inch (9.5 mm.) diameter head, ASTM F 1667, of a
length to penetrate through the roofing materials and a minimum of 3/4 inch (19.1
mm) into the roof sheathing. Where the roof sheathing is less than 3/4 inch (19.1
mm) thick, the fasteners shall penetrate through the sheathing. Fasteners must
comply with ASTM F 1667. Staples are not permitted for shingle application
unless specifically noted in the manufacturer's installation instructions on the
shingle package. Use 4 nails for standard installations, 6 for steep slope or high
wind areas.


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