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Old 02-18-2015, 10:14 AM   #1
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CB/Greenboard question for shower


I'm halfway through renovating a corner shower in my basement. The bathroom was stripped down to the studs, new green-board was put up, and the corner shower base was installed into a bed of wet mortar (so I can't take it up now). I know now that green board should not be used in showers but it's too late to take it out. I'm wondering how I can salvage this situation!

I need to use some type of CB because the walls need to be 'packed out' so there is over-hang at the shower flange. My question is, should I install Kerdi over the green board, then CB, then tile right over the CB? Or should I install the CB right over the green board and put Kerdi on top of the CB? My instinct says the 1st option is better because I like the idea of directly protecting the green board from moisture with the Kerdi. I've called Schluter and they said it was OK to put Kerdi on green board.

Lastly, the tiled shower walls will be raised above the level of the other walls when I apply the CB over top of the green board. How should I finish/seal the edges so they don't look terrible and are water tight?
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Old 02-18-2015, 07:08 PM   #2
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What is cb?
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Old 02-18-2015, 09:49 PM   #3
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Cleve,
Cb- cement board.

Beware,
Can you post any pics of what you have so far? Schluter's kerdi is made to go over drywall. I understand why you want to pack it out, not sure if I would bother with cement board if you're going to use the Kerdi. IF you put the kerdi over the green board then go over it with cb, I think you will be creating a future headache for yourself. If water gets behind the tile, it will get trapped in the cb and eventually the cb will go bad. I would probably cut out the drywall that's up, fur out the studs so that one layer of drywall would suffice, then apply the kerdi. Or if you furred out the studs, you could use just the cement board providing you applied a water proofing membrane like Redguard. At this point, I will defer to Jazman, he may have another idea.
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