Do I need a Tyvek-type barrier?
I am building g in nw ohio-zone 5- 2×4 walls filled with open cell foam and 2″ of foam (eps or xps ?) On the exterior of 7/16 osb sheeting. From what i’ve read, it seems like I do not need a tyvek type barrier. Not sure if I’m understanding that correctly and would appreciate further clarification. Thanks