Building out a 42' x 24' storage barn & work area. Floor is concrete. Construction is post & beam. For added structural stability I'm installing 7/16" OSB over the girts, then I will be covering the OSB with most likely 3/8" T 1-11. Between the sheathing material I will have a 1/4" air gap for draining out any potential accumulated water condensation or vapor. I'm wondering if I should also install a house wrap over the OSB, then my 1/4' air gap & finally the finished T1-11.
I'm asking because I really do not see a need for house wrap on an unheated building. As far as climate goes, I'm down here in South Crapolina where the summers are brutal from humidity, but the nice thing is I can run around all winter in shorts & a sweatshirt. Would welcome your opinions & experiences with this issue. Thanks!