radioman
Super Member
I see you are posting from MI. I'd wouldnt worry about untreated lumber being outside since the wood is already fastened to frame where it can gt air and dry out properly. Of course its best sooner the better to get the roof on. One thought tho- If you get the osb on the roof but no shingles but you do have time to put tar paper down, I'd cover it up with tarp or plastic and weigh it down since snow will ruin the OSB for sitting on it given you are from MI just like here in NYS.