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Re: OSB roof and shearwalls wet from these rain

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>Once the board has swollen there's not much to be done.  ALWAYS warn
>Contractors of the danger of using OSB in, especially, exposed locations,
>even with so-called exterior grade!!. 
Thor , It is cheaper in the USA.
Also the "all products association " APA should have application
specifications for the OSB.
Norb Vony , PE