Minimum Roof Sheathing Thickness

1 inch 25 4 mm.

Minimum roof sheathing thickness.

And for wood structural panel sheathing r803 2 2 allowable spans. 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. 8d ring shank nails should be used instead. The minimum plywood for roofing.

Roofs are framed with rafters or trusses which are rafters joined by internal braces so they install as a single component. 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. Many code requirements are not inspected. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7.

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. 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. You would go to table r503 2 1 1 1 to determine minimum nominal panel thickness.

Never attach roof sheathing with staples. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. This way no worrying about grabbing scraps to fill in small spots and not having the correct thickness. 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.

Rafters run from the peak of the roof. 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. According to 2009 irc table r803 1 minimum thickness of lumber roof sheathing.