Flat Roof Sheathing Thickness

Sheathing should be a minimum of 19 32 inch thick.

Flat roof sheathing thickness. Osb roof sheathing 7 16 inch thick approximate weight. The sheathing is the base you lay over the rafters that holds the roofing felt and shingles. Perlite board insulation cover board per inch of thickness. That s considered to be the minimum.

Roof material then covers all. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. 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. A strong resilient roof is a home s first line of defense when the roof deck is exposed to weather.

Apa the engineered wood association. Plywood is typically. Unlike with plywood siding the plywood sheet to be used for sheathing should be at least 3 8 inch thick. Get free estimates from local roofing contractors.

2018 international residential code. 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. 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. The inch thick boards extend from the eaves just past the exterior walls where they butt up against the plywood roof sheathing. Loads will vary with the. Contains sections covering roof framing roof sheathing and roof ventilation.

Copper panel roofing 16 oz. Installing sheathing on a flat roof is much easier than working on a peaked roof. On the upcodes website. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.

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