Flat Roof Sheathing Thickness

The sheathing is the base you lay over the rafters that holds the roofing felt and shingles.

Flat roof sheathing thickness.

Get free estimates from local roofing contractors. 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. Osb roof sheathing 7 16 inch thick approximate weight. Plywood is typically.

A strong resilient roof is a home s first line of defense when the roof deck is exposed to weather. On the upcodes website. 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 typical thickness range for sheathing is 3 8 to 3 4 inch.

Copper panel roofing 16 oz. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Sheathing should be a minimum of 19 32 inch thick. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick.

Perlite board insulation cover board per inch of thickness. Installing sheathing on a flat roof is much easier than working on a peaked roof. Loads will vary with the. 2018 international residential code.

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. The inch thick boards extend from the eaves just past the exterior walls where they butt up against the plywood roof sheathing. On the upcodes website.

Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Apa the engineered wood association. Sheathing comes in different thicknesses and what type of roof you have will help designate what type of thickness you need. As an example of what you can find in chapter 8 of the 2018 irc see.

If your roof is more on the flatter side then it s expected to have a heavier load.