It's nice that you can find links that tell you what you want to hear nowadays, but it just ain't always true.
Thirty years ago, it was considered acceptable to install tile over greenboard in wet or damp locations.
but experience has taught us that this will always fail - whether in three years or twenty depends on how much water it is exposed to. Green board is water resistant, not water proof.
Tile sealers are also water resistant and not water proof.
So anyone who doesn't mind taking a chance can go ahead and install over greenboard, but those of us who do appreciate quality and eschew moldy homes use professional installation methods to avoid that.
Excellence is its own reward!
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Member Since
11/07/2002
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1290 Posts
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Moderated by Handyman 
