Roof Sheathing Requirements

Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick.

Roof sheathing requirements. Refer to f rs 1 f rs 2 and f rs 3 documentation. 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. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7.

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. In high wind areas more fasteners may be required. Use a breathable underlayment applied over the sheathing. If roof sheathing is damaged verify new replaced roof deck thickness verify new replaced roof deck meets fortified minimum thickness requirements.

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. 1 photo per each panel of new replaced sheathing type and thickness. Roof sheathing shall be structural wood panels plywood osb with a minimum five eighths inch thickness grade stamped for use and span.

Loads will vary with the. Maximum 19 percent moisture content. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. 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. Sheathing type typically 15 32 inch or thicker panels are required in high wind areas. 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.

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. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively. Several factors must be considered when determining appropriate roof sheathing thickness such as the.