I need some help. I just stated my own business this year, I have primarily worked in commercial and industrial jobs before going on my own. Anyway the inspector on a new house I wired came to do final inspection. He stated that all electrical boxes on a outside wall had to be vapor tight and it was a code violation if they weren't. I cannot find anywhere to support this claim. He wants me to cut open the finished walls to replace all the boxes. I also questioned why he didn't tell me when he did the rough inspection. I told him to basically F$#% himself. But I do want to know what the code is for this so I can avoid on the next job. Thanks!