Roof Sheathing Requirements

Maximum 19 percent moisture content.

Roof sheathing requirements.

Roof sheathing material must be coordinated with the roofing itself since each type of roofing has special requirements. Refer to f rs 1 f rs 2 and f rs 3 documentation. Required sheathing thickness for roofing important factors. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7.

Roof sheathing shall be structural wood panels plywood osb with a minimum five eighths inch thickness grade stamped for use and span. 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. Sheathing type typically 15 32 inch or thicker panels are required in high wind areas. At exposed roof overhangs the sheathing must be rated for exposure to the weather.

That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. If roof sheathing is damaged verify new replaced roof deck thickness verify new replaced roof deck meets fortified minimum thickness requirements. Loads will vary with the.

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. 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 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.

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

Create a system of spaced sheathing above the solid sheathing using vertical and horizontal battens. 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. Use panels rated as exposure 1 or better.