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Yes, that is how it was designed to be used.
BTW. I caulked every angle. This will help with drafts.
Yes but not the paper stuff. Some have used tar paper which is not a proper vapor barrier but this baeing a chicken coop which will not be sealed up like a house is then that might...
I agree with most replies. OSB is not an exterior material but can be use if properly covered. Majority of homes have OSB sheathing but is then of course covered by a vapor barrier and siding. I have a playhouse and shed that has been standing for almost 10 years now. All made of OSB but...