A rainstorm in Seattle showed me why I needed a proper vapor barrier
Honestly, I was finishing the drywall in my 12x16 studio when a heavy rain hit for three days straight. I started to see dark spots forming on the new wall near the base. My buddy who builds houses came over, poked the drywall, and said, 'You skipped the 6 mil poly, didn't you?' He was right, I had just used insulation with a paper backing. I had to tear out a whole section, put up the proper plastic sheeting, and start over. Has anyone else in a wet climate had to fix this after the fact?