Minimum Roof Sheathing Thickness

This way no worrying about grabbing scraps to fill in small spots and not having the correct thickness.

Minimum roof sheathing thickness.

Sheathing should be a minimum of 19 32 inch thick. 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. 8d ring shank nails should be used instead. 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. According to 2009 irc table r803 1 minimum thickness of lumber roof sheathing. The minimum plywood for roofing. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively.

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. Rafters run from the peak of the roof. Never attach roof sheathing with staples. 1 inch 25 4 mm.

And for wood structural panel sheathing r803 2 2 allowable spans. 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. Roofs are framed with rafters or trusses which are rafters joined by internal braces so they install as a single component.

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. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. 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.