Mike,
I asked because 15 years ago when I built my house hear in NY, OSB on the roof was a no no. The advantge to OSB over plywood was the termite factor, so the sheathing of my house was OSB. I was told (15 years ago) that the only problem with OSB is if it gets wet it is like a sponge, that is why they use plywood on the roof.
That was 15 years ago, there will be a day soon that I will build another house, that was the reason for the question. Also in NY we do poured foundations, not block, what are our thoughts on that?
PS
Love the dogy dormers, adds character to the house....