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.

And for wood structural panel sheathing r803 2 2 allowable spans. 1 inch 25 4 mm. Never attach roof sheathing with staples. 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.

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. 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 minimum plywood for roofing.

8d ring shank nails should be used instead. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Roofs are framed with rafters or trusses which are rafters joined by internal braces so they install as a single component. The typical thickness range for sheathing is 3 8 to 3 4 inch.

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. 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. This way no worrying about grabbing scraps to fill in small spots and not having the correct thickness. You would go to table r503 2 1 1 1 to determine minimum nominal panel thickness.

Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7. Rafters run from the peak of the roof. 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.