Flat Roof Sheathing Thickness

As an example of what you can find in chapter 8 of the 2018 irc see.

Flat roof sheathing thickness.

2018 international residential code. Get free estimates from local roofing contractors. 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. Sheathing comes in different thicknesses and what type of roof you have will help designate what type of thickness you need.

On the upcodes website. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Contains sections covering roof framing roof sheathing and roof ventilation. That s considered to be the minimum.

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. Loads will vary with the. 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 sheathing is the base you lay over the rafters that holds the roofing felt and shingles. Zip system roof assembly combines our revolutionary integrated sheathing and flashing tape or liquid flashing to provide a sealed roof for protection against moisture intrusion during construction or if high winds strip the roof covering away. Roof material then covers all. The inch thick boards extend from the eaves just past the exterior walls where they butt up against the plywood roof sheathing.

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. Sheathing should be a minimum of 19 32 inch thick. Installing sheathing on a flat roof is much easier than working on a peaked roof. The typical thickness range for sheathing is 3 8 to 3 4 inch.

That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. 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. Plywood is typically.