Roof Sheathing Thickness Code

Contains sections covering roof framing roof sheathing and roof ventilation.

Roof sheathing thickness code.

Minimum 420 fb 660 000 e. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. 1 inch 25 4 mm. 2018 international residential code.

2018 international residential code. Allowable spans for lumber floor and roof sheathing a b for si. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Chapter 9 roof assemblies.

Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. 1 inch 25 4 mm. The typical thickness range for sheathing is 3 8 to 3 4 inch. You would go to table r503 2 1 1 1 to determine minimum nominal panel thickness.

Sheathing should be a minimum of 19 32 inch thick. Chapter 8 roof ceiling construction. 8d ring shank nails should be used instead. 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. Loads will vary with the. Roof sheathing shall be structural wood panels plywood osb with a minimum five eighths inch thickness grade stamped for use and span. Never attach roof sheathing with staples.

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. Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of section 2304 7. 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. And for wood structural panel sheathing r803 2 2 allowable spans.

Many code requirements are not inspected. On the upcodes website. On the upcodes website.