Flat Roof Sheathing Thickness

Contains sections covering roof framing roof sheathing and roof ventilation.

Flat roof sheathing thickness.

Installing sheathing on a flat roof is much easier than working on a peaked roof. As an example of what you can find in chapter 8 of the 2018 irc see. 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. A strong resilient roof is a home s first line of defense when the roof deck is exposed to weather.

The inch thick boards extend from the eaves just past the exterior walls where they butt up against the plywood roof sheathing. Sheathing should be a minimum of 19 32 inch thick. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. The typical thickness range for sheathing is 3 8 to 3 4 inch.

Plywood is typically. On the upcodes website. Roof material then covers all. The sheathing is the base you lay over the rafters that holds the roofing felt and shingles.

If your roof is more on the flatter side then it s expected to have a heavier load. On the upcodes website. That s considered to be the minimum. 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.

That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. 2018 international residential code. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. Loads will vary with the.

Sheathing comes in different thicknesses and what type of roof you have will help designate what type of thickness you need. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. 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.