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Unread 12-16-2013, 06:39 PM   #1
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Tile on greenboard for tub/shower surround?

Over the weekend my fella and hired help hung greenboard in our recently gutted bathroom. My job is to do the tiling. The greenboard is also installed in the tub/shower surround, instead of the typical 1/2" cement board. What to do?

Can I get away with simply doing a good caulking/grout job? Or should I pay to tear out this new stuff and put in cement board? I don't want to replace everything again in ten years, but then again I'm not expecting it to last for a hundred either.
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Unread 12-16-2013, 06:53 PM   #2
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Hi Nicole,
Greenboard is not approved for use as a tile backing in a shower or shower/tub surround.

Tile and grout are not waterproof so whatever you install them over need s to take csare of that. One option would be to use a sheet membrane like Kerdi. Another would be to remove the greenboard and put up a vapor barrier (6 mil plastic works well) then install cement backer board.
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Unread 12-16-2013, 08:41 PM   #3
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nicole: you'll be lucky to get two years out of a tile over greenboard shower and you'll be left with a huge black mold mess in the bargain.

You can buy two gallons of Redgard waterproofing membrane and paint it on the greenboard. That's two nice thick coats. Also highly recommend using fibergrlass mesh tape on seams and inside corners. There should be no drywall mud under the redgard either.
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Unread 12-16-2013, 08:53 PM   #4
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Im not sure if one is "supposed" to use redguard on drywall. Pretty sure it needs to be cement board.
That said, i did use it in my own shower over green board (before I knew not to) and its fine. I have seen inside the wall cavity (working on another room) and its fine. No leaks.
Might be ok on a tub surround, but id probably just put kerdi over the drywall.
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Unread 12-16-2013, 10:19 PM   #5
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Another vote for Kerdi over the existing drywall.....and that's not just a band-aid fix, that is the way Schluter says to do it and it is code approved if done correctly. (But hopefully there is NO plastic sheeting already up behind the greenboard that would create the 'moisture sandwich'.)
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