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vapor barrier behind cement board

3K views 1 reply 2 participants last post by  Just Bill 
#1 ·
i have come across different advice regarding the use of vapor barrier behind cement board.

the Hardiebacker (which is what i am using for my bathroom) documentation does not mention anything about it but a book that i have does.

should i use vapor barrier behind hardiebacker or not?

thanks
 
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