I am putting in a new tub and tiling the shower walls and I have taken everything down to the studs. Do I need to use a vapor barrier when using cement backer board? I have been reading lots of information and watching several videos that all call for different techniques. Some only use the cement backer board and then others use 6mil poly plastic over studs or 15lbs felt paper over studs before cement board. Is it necessary on an interior wall? Thanks in advance for the help.
vapor barrier is for exterior walls to keep warm moisture laden air from escaping into the wall framing. you dont need it for the bathroom wall if its an interior wall. just be sure to properly waterproof the concrete board with kerdi first
The answer to your question depends entirely on where you live.
You don't put a vb behind Kerdi.
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