I'm late to the party, but I do have a comment. Our barn is situated on a north-south line, the prevailing winds are southwest/west. I'm not sure why they built the barn the way they did, but there were too many times that I wished it had been east-west for drainage purposes - nothing worse than coming to the barn first thing in the morning and finding poo laden gutters full of water. Now, the direction of the barn seems to fit well with the new section of the barn open to the breezes in the summertime with the curtain walls. I'd say check your prevailing wind, but also check your drainage and the direction that water will run out of the barn.
