I live in chicago and believe that I need to add a vapor barrier to the walls of a rehabbed sleeping porch. I recently added open cell spray foam to the walls and am trying to figure out what to use to create a vapor barrier. I went to the local Home Depot and they did not know what to use so now I am confused because I thought this was a common thing.
Anyway, what should I use for a vapor barrier? Any specific type of plastic sheeting, calk and tape? Obviously I prefer something that I can pickup at the local hardware store.
I appreciate any advice that you can offer.