We removed the drywall behind our lower kitchen cabinets. It had some water damage and we wanted to get it repaired before new cabinets come in. Long story short. My husband is trying to decide what to put on the wall. Cement board or green board. There was a vapor barrier that was pretty much shredded so had to cut off and we removed and replaced insulation. Question for you of Houzz .... 1. How necessary is the vapor barrier to replace 2 cement board or green board? We are getting tile installed and they will typically cut out drywall and install cement backer board..... So is it better to have it going all the way down or can we use the green board?