As long as it's dry, there shouldn't be any problems. I insulated and
sheetrocked our detached garage and it has been fine for the last 9+ years,
even though there's a bit of moisture that drips off vehicles, or when I
hose down the garage floor.
I sheetrocked "part" of our small pump house also, but got busy with other
tasks and haven't finished that project. No problems there either.
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