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Old 02-21-2010, 05:01 PM   #1
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Bathroom floor vapor barrier


Hello I found this site searching for the answer to my question so I'm a very new. Did a site search also and couldn't find a answer to my question.

I'm installing 12"X12" porcelain tile in our bathroom. Our house is 5 years old. The bathroom is on the second floor with a 3/4" plywood subfloor. I'm going to install it over Hardibacker but I'm wondering about a vapor barrier. Is one necesarry if you are using Hardibacker? And does it go over the plywood or over the Hardibacker? The vapor barrier I was looking at was at Lowe's and was called AquaDefense by Mapei. Thanks for any help.

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Old 02-22-2010, 06:27 AM   #2
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Bathroom floor vapor barrier


A vapor barrier is different from a moisture barrier, but while neither is a necessity in a bathromm floor, it is not a bad idea. If the grout and tile are intact, the floor is essentially waterproof, but then you are not going to be flooding the floor everyday, in theory.

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Old 02-22-2010, 08:59 PM   #3
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Bathroom floor vapor barrier


Thank you. Just from reading around it looks like everyone recommends it on the wall but not the floor. Thanks for your help.
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