I’m sure there are many uses for vapor barriers, but if I were in charge of the big orange box, I’d put it near the cement board. After three different stores, I was finally able to find vapor barrier off by itself near the outdoor tile. From what I have read and from talking to people, it is common practice to use a vapor barrier behind your cement backer board in warm climates. Now that I’ve found it, I have two questions.

1. Is this an appropriate vapor barrier?

2. How do you install it? Is there a standard overlap? Do I need to tape the seems?

Vapor Barrier