Irc Roof Sheathing Requirements

Spaced lumber sheathing for wood shingle and shake roofing shall conform to the requirements of sections r905 7 and r905 8.

Irc roof sheathing requirements.

Never attach roof sheathing with staples. As an example most building codes being used before hurricane andrew allowed roof sheathing to be attached using 6d nails spaced 6 inches along panel. Wood structural panel roof sheathing shall be bonded by exterior glue. 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.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. 8d ring shank nails should be used instead. Allowable spans for lumber used as roof sheathing shall conform to table r803 1. The typical thickness range for sheathing is 3 8 to 3 4 inch.

International residential code 2015 irc 2015. Each manufacturer shall publish the allowable maximum loads and spans for service as floor and roof sheathing for their treatment. Back to diagram. 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.

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. A certificate of inspection issued by a lumber grading or inspection agency meeting the requirements of this section shall be accepted. Where the roof sheathing is less than 3 4 inch 19 mm thick the. 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.

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. Sheathing r803 irc provisions. 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. 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.

Spaced lumber sheathing is not allowed in seismic design. Sheathing should be a minimum of 19 32 inch thick.