Exterior stud walls shall be sheathed to resist the racking load of wind as set forth in Section 1620 and the concentrated loads that result from hurricane-generated wind-borne debris as set forth in Section 1626 of this code and shall be, at a minimum, any of the following types:
- Tightly fitted, diagonally placed boards not less than 5/8- inch (17 mm) thickness, nailed with three 8d common nails to each support for 1-inch by 6-inch (25 mm by 152 mm) boards and four 8d common nails for 1-inch by 8-inch (25 mm by 203 mm) boards.
- Wall sheathing shall be plywood, or product approved structural panel, rated Exposure 1 with a minimum thickness of 19/32 inch (15 mm) and shall be applied to studs spaced not more than 16-inches (406 mm) on center. Wall sheathing shall be continuous over three or more supports and shall be nailed to such supports with 8d common nails. Nail spacing shall not exceed 6-inches (152 mm) on center at panel edges and all intermediate supports. Nail spacing shall be 4-inches (102 mm) on center at corner studs, in all cases.
- When plywood panel, or product approved structural panel sheathing is used, building paper and diagonal wall bracing can be omitted.
- When siding such as shingles nailed only to plywood or product approved structural panel sheathing, the panel shall be applied with face grain across studs.