Irc Roof Sheathing Requirements

Each manufacturer shall publish the allowable maximum loads and spans for service as floor and roof sheathing for their treatment.

Irc roof sheathing requirements.

Sheathing should be a minimum of 19 32 inch thick. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. A certificate of inspection issued by a lumber grading or inspection agency meeting the requirements of this section shall be accepted.

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. Roof sheathing conforming to the provisions of table 2304 7 1 2304 7 2 2304 7 3 or 2304 7 5 shall be deemed to meet the requirements of this section. 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. Fasteners for asphalt shingles shall be galvanized steel stainless steel aluminum or copper roofing nails minimum 12 gage 0 105 inch 3 mm shank with a minimum 3 8 inch diameter 9 5 mm head complying with astm f1667 of a length to penetrate through the roofing materials and not less than 3 4 inch 19 1 mm into the roof sheathing.

Where the roof sheathing is less than 3 4 inch 19 mm thick the. The typical thickness range for sheathing is 3 8 to 3 4 inch. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. 8d ring shank nails should be used instead.

Spaced lumber sheathing is not allowed in seismic design. Fasteners for asphalt shingles shall be galvanized steel stainless steel aluminum or copper roofing nails minimum 12 gage 0 105 inch 3 mm shank with a minimum 3 8 inch diameter 10 mm head astm f 1667 of a length to penetrate through the roofing materials and a minimum of 3 4 inch 19 mm into the roof sheathing. Back to diagram. Wood structural panel roof sheathing shall be bonded by exterior glue.

This also means that when re roofing there are opportunities to improve the roof s wind performance by following best practices for roof to wall and sheathing attachment. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. International residential code 2015 irc 2015. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.

Allowable spans for lumber used as roof sheathing shall conform to table r803 1. Sheathing r803 irc provisions.