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If it was me, I'd be using plywood, not OSB, just in case moisture ever does get under it. Plus, don't forget that humidity from inside the house will be going through to the outside as the house "breathes" (hence Tyvek/typar being a barrier to let moisture out, but not in), and OSB isn't always good with humidity. Remember to tape the tyvek seams very well, and overlap pieces a good 6 inches.
Just my 2cents.
Just my 2cents.
