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Unread 05-26-2005, 04:19 PM   #1
wessieball
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Join Date: Feb 2005
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1/4" Hardi over Drywall

I had recently posted a thread concerning tiling a tub enclosure already drywalled. I don't feel comfortable putting tile directly over the drywall and want to put 1/4" hardi down over the drywall. Some of you suggested a vapor barrier between the hardi and the drywall. I spoke to one of the techs at Hardi and they said I didn't need a vapor barrier (essentially the hardi IS the vapor barrier). Any suggestions?
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Unread 05-26-2005, 04:39 PM   #2
bbcamp
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Normally, we defer to the manufacturer, but in this case I think the rep was wrong. Hardibacker is not waterproof, vaporproof or anything-proof. Moisture will get through the tile at the grout lines, and will get through the hardiboard. The next thing it sees will be the paper on the drywall. Mold food!
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Unread 05-27-2005, 08:58 AM   #3
wessieball
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Somebody in the other thread mentioned using plastic sheeting. Im assuming that will work, right?
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Unread 05-27-2005, 10:44 AM   #4
bbcamp
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yes, 6-mill poly sheeting will work.
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