Minimum Roof Sheathing Thickness

Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively.

Minimum roof sheathing thickness.

1 inch 25 4 mm. And for wood structural panel sheathing r803 2 2 allowable spans. This way no worrying about grabbing scraps to fill in small spots and not having the correct thickness. Osb roof decking thickness 7 16 1 2 or 5 8 if were using osb we get 9 16 we dont worry about getting both 7 16 and 9 16 for walls then the roof we just get all of the same.

Sheathing should be a minimum of 19 32 inch thick. Roofs are framed with rafters or trusses which are rafters joined by internal braces so they install as a single component. 2 the thickness or rating of roof sheathing on a roof not used as a walking deck shall conform to either table 9 23 15 7 a. Building codes for roofing reqiure a minimum 1x4 and the spaces between battens should not exceed 3 1 2 inches figure 2 46 wood shingles over spaced sheathing and figure 2 47 wood shakes installed over wood sheathing are illustrated below.

Thickness or rating 1 the thickness or rating of roof sheathing on a flat roof used as a walking deck shall conform to either table 9 23 14 5 a. Where the rafter spacing is 24 inches on center or less roof boards may be used that have a minimum thickness of 5 8 inch for solid sheathing and 3 4 inch for spaced sheathing. According to 2009 irc table r803 1 minimum thickness of lumber roof sheathing. Many code requirements are not inspected.

Never attach roof sheathing with staples. 8d ring shank nails should be used instead. The minimum plywood for roofing. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7.

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. You would go to table r503 2 1 1 1 to determine minimum nominal panel thickness. Rafters run from the peak of the roof.