Flat Roof Sheathing Thickness

Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick.

Flat roof sheathing thickness.

The sheathing is the base you lay over the rafters that holds the roofing felt and shingles. Plywood is typically. That s considered to be the minimum. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick.

Installing sheathing on a flat roof is much easier than working on a peaked roof. Get free estimates from local roofing contractors. Contains sections covering roof framing roof sheathing and roof ventilation. If your roof is more on the flatter side then it s expected to have a heavier load.

The typical thickness range for sheathing is 3 8 to 3 4 inch. 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. As an example of what you can find in chapter 8 of the 2018 irc see. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.

Loads will vary with the. The inch thick boards extend from the eaves just past the exterior walls where they butt up against the plywood roof sheathing. 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. 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.

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. On the upcodes website. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. A strong resilient roof is a home s first line of defense when the roof deck is exposed to weather.

On the upcodes website. 2018 international residential code. Sheathing comes in different thicknesses and what type of roof you have will help designate what type of thickness you need.