Irc Roof Sheathing Requirements

The irc section r902 1 requires class a b or c fire resistant roofing only in jurisdictions designated by law or where the edge of the roof is less than 3 feet from the property line.

Irc roof sheathing requirements.

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. Spaced lumber sheathing for wood shingle and shake roofing shall conform to the requirements of sections r905 7 and r905 8. Never attach roof sheathing with staples. Where the roof sheathing is less than 3 4 inch 19 mm thick the fasteners shall penetrate through the sheathing.

Maximum 19 percent moisture content. Ridge board shall be not less than 1 inch 25 mm nominal thickness and not less in depth than the cut end of the rafter. 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. Fasteners shall comply with astm f 1667.

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. Sheathing should be a minimum of 19 32 inch thick. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Cap nail shank and cap staple legs shall have a length sufficient to penetrate through the roof sheathing or not less than 3 4 inch into the roof sheathing.

The typical thickness range for sheathing is 3 8 to 3 4 inch. Allowable spans for lumber used as roof sheathing shall conform to table r803 1. 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. Rafters shall be framed not more than 1 1 2 inches 38 mm offset from each other to ridge board or directly opposite from each other with a gusset plate as a tie.

8d ring shank nails should be used instead. Table 2304 7 2 sheathing lumber minimum grade requirements. Slate and slate type shingles. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7.

Jurisdictions in the us do not commonly require fire resistance classifications for roof coverings on one and two family residential dwellings. These schedules assume the use of wood structural panels 5 8 inch thick or less and are appropriate for enclosed buildings with a mean roof height of up to 35 feet in exposure b locations. 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.