Back in the day when OSB was a newer product, I always heard that it would
handle three times being soaked without any problems. Snow should cause NO
problems if you get it off before the sun hits it hard. I've seen it soaked
so many times that the edges blow up over a quarter inch though. Around
here the high volume builders could give a crap if it blew up to an inch and
a half anyway. I try to avoid those kind of guys.
I know I'm a Luddite, and it is probably a moot point anyway since I'll
never be able to afford a new-construction house, but I still don't
trust OSB for subfloor or roof decking, or corner sheathing. It just
looks and feels wrong. I suppose it is okay for the web in engineered
joists, which seem to be the modern standard, but anything facing the
weather, I want real plywood.
A lot of people are using Georgia-Pacific Plytanium product called
Dryply. It can survive a month or so of bad weather. It is
manufactured for greater stiffness as needed in subflooring. Our local
Menards store carries it and this is my choice for subflooring
projects, especially in bathroom and utility areas where disasters
might occur. The price is not that much more than ordinary CDX. With
ring shank nails or construction screws it does seem more rigid than
conventional subflooring. Plytanium and Dryply fit together OK with
tongue and groove edges, too.
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