Flooring Tile - Backerboard over damaged green rock

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tinaowens
01-25-05, 07:24 PM
I'm refinishing my guest bath and in removing the old tiles from around the tub, the green rock board behind has had the paper severely damaged. I was going to apply concrete backerboard using a layer of thinset and screws. Do I have to patch the paper on the old green rock before I add the concrete backerboard? Also, with the green rock in place, can I use 1/4" concrete board over it to reduce the additional width? :confused:

Daniel Wachtel
01-25-05, 07:39 PM
Tear out the greenboard install a moisture barrier and install 1/2 inch cement board.
tinaowens
01-26-05, 01:50 PM
What type of moisture barrier? I read somewhere else to line the studs with #16 roofing paper? Is that adequate? What about a drip pan in the bottom?

Daniel Wachtel
01-26-05, 09:41 PM
Staple up some 8mil plastic and screw the CBUs right to the studs.