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Community and Q&A

When OSB Sheathing Gets Wet

Mecajunboy01 | Posted in General Questions on

With all the rain lately, as I’m waiting to apply the Shingles to my shed, anyone have any idea how much water the exposed OSB sheeting will tolerate b4 it starts to deteriorate / swell.

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  1. Expert Member

    OSB can handle rain OK, but it resists water better when it's a vertical surface, such as a wall. If you're going to put shingles on later, I'd go ahead and at least cover it with #15. That'll alleviate a large portion of the water that ever touches the surface, and will allow it to dry between rains.

    A month isn't the worst thing in the world. Obviously the sooner you cover it the better it'll be.

    1. Mecajunboy01 | | #2

      Just tack it over the wet OSB?

      1. Expert Member
        MALCOLM TAYLOR | | #3


        Yes. Building paper and house-wrap are permeable. That is they designed top allow drying to the outside, without letting rain water in.

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