Flat Roof Sheathing Thickness

A strong resilient roof is a home s first line of defense when the roof deck is exposed to weather.

Flat roof sheathing thickness.

The typical thickness range for sheathing is 3 8 to 3 4 inch. Sheathing comes in different thicknesses and what type of roof you have will help designate what type of thickness you need. 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.

Steeper roofs tend to have thinner sheathing due to not much weight being applied to the roof while flat and low sloop roofs that are likely to gather weight from precipitation or people walking on it. The inch thick boards extend from the eaves just past the exterior walls where they butt up against the plywood roof sheathing. As an example of what you can find in chapter 8 of the 2018 irc see. Roof material then covers all.

Sheathing should be a minimum of 19 32 inch thick. Contains sections covering roof framing roof sheathing and roof ventilation. That s considered to be the minimum. 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.

Get free estimates from local roofing contractors. On the upcodes website. Installing sheathing on a flat roof is much easier than working on a peaked roof. This minimum will only work if the rafters are set 16 inches apart at most and if the roof doesn t have too much load.

Loads will vary with the. The sheathing is the base you lay over the rafters that holds the roofing felt and shingles. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. If your roof is more on the flatter side then it s expected to have a heavier load.

2018 international residential code. On the upcodes website. Plywood is typically.