Originally Posted by tom12
Thanks for your replies, but i'm not much further ahead. I'm looking for a sound method of floating given the above conditions. Backer board is obviously not the answer.
AAMOI, San Jose bldg dept were passing shower walls with drywall behind a floated coat up to 2001, as far as i recall.
Why would you NOT want to do a wet area with CBU, which IS the industry standard for tile installation, both wet and dry?
I suspect that you should research what is common practice in tile today.