Roof Sheathing Thickness Code

Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick.

Roof sheathing thickness code.

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. Installation details shall conform to sections 2304 7 1 and 2304 7 2 for floor and roof sheathing respectively. Chapter 9 roof assemblies. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.

Chapter 8 roof ceiling construction. Minimum thickness of lumber roof sheathing for si. Loads will vary with the. On the upcodes website.

8d ring shank nails should be used instead. 2018 international residential code. Many code requirements are not inspected. Contains sections covering roof framing roof sheathing and roof ventilation.

Roof sheathing shall be structural wood panels plywood osb with a minimum five eighths inch thickness grade stamped for use and span. On the upcodes website. And for wood structural panel sheathing r803 2 2 allowable spans. Secure roof sheathing panels to the roof framing with 8d common nails spaced six inches on center at the edges and twelve inches on center at intermediate supports.

Allowable spans for lumber floor and roof sheathing a b for si. Minimum 420 fb 660 000 e. The typical thickness range for sheathing is 3 8 to 3 4 inch. 2018 international residential code.

Sheathing should be a minimum of 19 32 inch thick. You would go to table r503 2 1 1 1 to determine minimum nominal panel thickness. 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. According to 2009 irc table r803 1 minimum thickness of lumber roof sheathing.

That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7. 1 inch 25 4 mm.