A drywall contractor advises placing greenboard behind showers and tubs where a cement based tile base will be floated in for the tile. The tile guy says use only cement board as a base. I’m thinkin’ the drywall guy is loony. It is a VERY dry climate, but I’m thinking the cost of cement board is relatively cheap and provides a great base no matter what way the tile will be installed. Comments?
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Drywall can be used if a waterproof membrane (sheet or roll on) is applied between the wall mud and the tile. IMHO this a best practice no matter what is on the walls.
Ultimately, if you want the guy doing the shower to warranty his work it should be done his way.
YMMV
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