2015 Irc Roof Sheathing Requirements

Attics should have ventilation to allow heat and moisture to escape the attic space.

2015 irc roof sheathing requirements. Allowable spans for lumber used as roof sheathing shall conform to table r803 1. 8d ring shank nails should be used instead. Solid sheathing is required in areas where the average daily temperature in january is 25 f 4 c or less or where there is a possibility of ice. The international codes i codes are the widely accepted.

As an alternative adhered underlayment complying with astm d1970 shall be permitted. For asphalt shingle roofs drip edges are required pre 2015 irc section r905 2 8 5. Sheathing should be a minimum of 19 32 inch thick. The cap nail shank shall be a minimum of 12 gage 0 105 inch 2 67 mm with a length to penetrate through the roof sheathing or a minimum of 3 4 inch 19 1 mm into the roof sheathing.

The framing details required in section r802 apply to roofs having a minimum slope of three units vertical in 12 units horizontal 25 percent slope or greater. Any existing ventilation of the attic space such as by ridge vents must not be restricted reduced or eliminated by the reroofing installation. Class a roof assemblies include ferrous or copper shingles or sheets metal sheets and shingles clay or concrete roof tile or slate installed on noncombustible decks. Jurisdictions in the us do not commonly require fire resistance classifications for roof coverings on one and two family residential dwellings.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Roof ceilings shall be designed and constructed in accordance with the provisions of this chapter and figures r606 11 1 r606 11 2 and r606 11 3 or in accordance with awc nds. Never attach roof sheathing with staples. 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.

Icc digital codes is the largest provider of model codes custom codes and standards used worldwide to construct safe sustainable affordable and resilient structures. Class a roof assemblies include minimum 16 ounces per square foot copper sheets installed over combustible decks.