Roof Sheathing Requirements

Roof sheathing material must be coordinated with the roofing itself since each type of roofing has special requirements.

Roof sheathing requirements.

Use panels rated as exposure 1 or better. 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. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. The everyday sheathing used on the body of a roof is not rated for weather exposure so when exposed eaves and or rakes occur at the.

Required sheathing thickness for roofing important factors. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Several factors must be considered when determining appropriate roof sheathing thickness such as the. If roof sheathing is damaged verify new replaced roof deck thickness verify new replaced roof deck meets fortified minimum thickness requirements.

Roof sheathing shall be structural wood panels plywood osb with a minimum five eighths inch thickness grade stamped for use and span. In high wind areas more fasteners may be required. Maximum 19 percent moisture content. Use a breathable underlayment applied over the sheathing.

Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood. At intermediate supports fasten panels 12 inches on center. Refer to f rs 1 f rs 2 and f rs 3 documentation. At exposed roof overhangs the sheathing must be rated for exposure to the weather.

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. Create a system of spaced sheathing above the solid sheathing using vertical and horizontal battens. Loads will vary with the. Oriented strand board osb or plywood can be used although plywood will provide higher nail head pull through resistance.

Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7. 1 photo per each panel of new replaced sheathing type and thickness.