Roof Sheathing Requirements

1 photo per each panel of new replaced sheathing type and thickness.

Roof sheathing requirements.

Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. Roof sheathing shall be structural wood panels plywood osb with a minimum five eighths inch thickness grade stamped for use and span. Maximum 19 percent moisture content. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively.

Typical types of wood used for roof sheathing are oriented strand board known as osb and plywood. 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. 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. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.

Use a breathable underlayment applied over the sheathing. Several factors must be considered when determining appropriate roof sheathing thickness such as the. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7. At exposed roof overhangs the sheathing must be rated for exposure to the weather.

Required sheathing thickness for roofing important factors. At intermediate supports fasten panels 12 inches on center. If roof sheathing is damaged verify new replaced roof deck thickness verify new replaced roof deck meets fortified minimum thickness 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.

In high wind areas more fasteners may be required. Roof sheathing material must be coordinated with the roofing itself since each type of roofing has special requirements. Create a system of spaced sheathing above the solid sheathing using vertical and horizontal battens. Sheathing type typically 15 32 inch or thicker panels are required in high wind areas.

Oriented strand board osb or plywood can be used although plywood will provide higher nail head pull through resistance. 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.