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Old 04-14-2008, 12:00 PM   #1
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Shower tile project (questions)

I'm re-tiling a stand alone shower and tub area. When I removed the previous tile there was 2 layers of green board. One of course on the studs then another smaller piece on top of it. The previous tile had mud caps so I figured that was the reason for the two layers. My new tile does not have the mud caps just bull-noses so if I replaced it with two layers (backer board) the tile would not sit flush. My question is is it ok to use just one layer of backer board? Also should there be a space between the bottom of the board and the flange of the tub or shower for expansion?
This will be the first post of many so please be patient.


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Old 04-14-2008, 01:37 PM   #2
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One layer of backer is fine. No green board is required. I leave a small gap for caulk. I tile over the transition between the backer and the greenboard with my bullnose.


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Old 04-16-2008, 08:37 PM   #3
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I never use green board. Think about it. Chances are the part that gets wet is the raw edge at the bottom and that's not the waterproof part. I used to use regular drywall with plastic behind it and use that aluminum duct tape on the raw edges to water proof it. Under most conditions that's good enough for walls. You can put the aluminum tape in the corners too. If your caulking and your grout work is kept in good repair, water won't get through. If the day comes it's been leaking bad and you have to repair it you'll be ripping off the backer board anyway, no matter what it is and if you are replacing taps it likely has to come off too. If you really want some overkill use the cement board stuff.
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Old 04-16-2008, 08:39 PM   #4
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Oh, also fill the tub with water before you caulk it. If there's any slight movement the water will hold it down and decrease the chances of the caulking letting go. Check your caulking frequently and replace when necessary.
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