On Sun, 15 Dec 2013 13:32:20 -0800, "Bob F"
wrote:

Snag wrote:
."

http://www.custombuildingproducts.com/products/surface-preparation/membranes-underlayments/redgard.aspx

Video:

http://www.youtube.com/watch?v=mG5GIqcYkSs#t=24

Interesting stuff , but not applicable in my case . I'm on a
suspended wood floor , and will be using a two-part shower drain flange with a
vinyl pan . Floor will be 4:1 sand/cement dampened enough to pack and bond
then tiled . Walls will be concrete backer board on the bottom 3 feet ,
green board sheetrock above .

My last project I used HardiBacker all the way to the ceiling and redgarded
that. I will NEVER use greenboard in a shower again. That was why I was re-doing
the shower.

HardiBacker is the only way to go. It's easy to work with (a few
precautions are needed against dust) and lasts forever. Greenboard
was never recommended for wet locations.