Roof Sheathing Requirements

Or less roof fastening zone wind main sheathing to gable overhang velocity roof end wall framingg eaves 3 second panel 123 2 3 2 3.

Roof sheathing requirements.

Roof sheathing fastening schedulea b c d e 8d common 0 131 x 2 1 2 inches or ring shank 0 135 x 2 1 2 inches except where noted for exposure b enclosed buildings roof framing spaced 24 inches o c. Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood. Roof sheathing shall be structural wood panels plywood osb with a minimum five eighths inch thickness grade stamped for use and span. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.

Sheathing type typically 15 32 inch or thicker panels are required in high wind areas. Refer to f rs 1 f rs 2 and f rs 3 documentation. Fasten roof sheathing panels properly fasten panels with a minimum of 8d common 0 131 inch by 2 1 2 inch nails spaced a maximum of 6 inches on center at supported panel ends and edges. Required sheathing thickness for roofing important factors.

Create a system of spaced sheathing above the solid sheathing using vertical and horizontal battens. At exposed roof overhangs the sheathing must be rated for exposure to the weather. 1 photo per each panel of new replaced sheathing type and thickness. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively.

Oriented strand board osb or plywood can be used although plywood will provide higher nail head pull through resistance. Roof sheathing material must be coordinated with the roofing itself since each type of roofing has special requirements. Secure roof sheathing panels to the roof framing with 8d common nails spaced six inches on center at the edges and twelve inches on center at intermediate supports. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7.

Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. In high wind areas more fasteners may be required. Maximum 19 percent moisture content. If roof sheathing is damaged verify new replaced roof deck thickness verify new replaced roof deck meets fortified minimum thickness requirements.

At intermediate supports fasten panels 12 inches on center. Several factors must be considered when determining appropriate roof sheathing thickness such as the. Use a breathable underlayment applied over the sheathing.