Gyp sheathing vs plywood sheathing

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Brendan Clifford

September 10, 2023 21:26

When should you use Gypsum sheathing and when should you use plywood sheathing?

Can plywood sheathing be used for types I and II? If it is does it have to be FRT, since plywood is combustible?

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  Christine Williamson Cronin September 21, 2023 14:29

  The reason to use plywood (or OSB) is nearly always structural— you can nail into it and it provides shear strength. Gypsum sheathings are not structural, but they are non-combustible and can help achieve whatever fire rating is required.

  I’m not sure if FRT plywood is ever used in Type I or Type II construction, but I’ve never seen it. Shear strength comes from either bracing or concrete.

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