OSB had some issues when it first came out a few decades ago, but it's been the standard for a very long time now for sheathing and decking. On sheer strength, it's equal to good quality plywood of the same thickness and superior to construction grade plywood because of all the voids in plywood and frequency of delaminating. For the same reason, it's better for decking and holding shingles in place because it doesn't have the voids in the center or the bottom layer blows off when the nail goes through it. I love plywood for a lot of things, but not so much for a shell around a house.
JHurt. Can you inform us about how you are going to use the radiant heating? What is driving it? How cold do your winters get in MO?
Eddie. Here in the PNW our buildings are subjected to a lot of rain before getting enclosed. For a litttle she shed I am building for the wife I chose Plywood due to bad experience with OSB in the rain before (1996 OSB). Has it changed enough to withstand prolonged exposure to rain (2 weeks worse case?) The plywoood we got wasn't that great this time around, seems like wood just isn't what it used to be. Also, would you consider OSB for inside wall paneling for a shop?
I was wondering what is providing the hot water for the radiant heating