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Does OSB waferboard sheathing OK in the rain?

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Posted 2013-08-04T20:31:29+0000  by bluetinkerer bluetinkerer
 

Hey bluetinkerer.

 

OSB is certainly not cut out for damp places but it will forgive you a couple times in certain applications. Builders use it on roofs and walls because plywood is notorious for warping. It is more forgiving on vertical surfaces because the water can run off. OSB will start to flake off if water sits on it for any decent amount of the time, when horizontal.

 

The best plan is to assume that it can't get wet and cover it whenever possible.

 7/16 in. x 4 ft. x 8 ft. OSB Sheathing

Posted 2013-08-04T21:11:24+0000  by Ingar_HD_ATL

How  much time do i have to cover up ? i am worried about rain before i finish the building.

Posted 2013-08-06T23:46:11+0000  by bluetinkerer

Hey bluetinkerer. 

 

Houses get rained on when they are being built. It will be fine getting wet a few times, just uncover it when the sun is out and let it dry out before you put roofing felt over it to roof it. They use waterproof adhesives that are actually pretty durable. I like to air on the side of caution and preach covering it as this will help save the integrity of the project. 

 

You have time, just cover it when you can and get this building dried in as soon as possible.

Posted 2013-08-08T13:07:53+0000  by Ingar_HD_ATL
 
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