Required Thickness Of Roof Sheathing

Sheathing should be a minimum of 19 32 inch thick.

Required thickness of roof sheathing.

In areas where the average daily temperature in january is 25 f or less solid sheathing is required on the lower section of the roof to support an eaves membrane. According to 2009 irc table r803 1 minimum thickness of lumber roof sheathing. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. If the nails penetrate the sheathing but not the studs the minimum plywood thickness that the irc designates is 1 2 inch.

Screws can be used for typical layout of roof sheathing panels on gable end roof typical layout of roof sheathing panels on hip roof. The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that. The eaves membrane should extend into the house 24 inches past the interior face of the outside wall. 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.

Never attach roof sheathing with staples. The typical thickness range for sheathing is 3 8 to 3 4 inch. 8d ring shank nails should be used instead. In practice many builders default to 1 2 inch plywood even if they plan.

Wood structural panel roof sheathing shall be bonded by exterior glue. Ommended that deformed shank nails be used throughout the entire roof. Many code requirements are not inspected. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.

Roof sheathing conforming to the provisions of table 2304 7 1 2304 7 2 2304 7 3 or 2304 7 5 shall be deemed to meet the requirements of this section. And for wood structural panel sheathing r803 2 2 allowable spans. For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended. 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.

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