Okay...no tile on the ceiling.
I would use Denshield in this case. Shove it up tight against the ceiling and caulk that joint. There is absolutely no reason to run tape up there and create more work. Once the tile is in, caulk that juncture again, don't grout it, CAULK IT.
I don't know where you would get a Fiberglas tile backer board. I doubt there is such a thing. Never seen one.:no:
Is this "Whirlpool Tub" suitable for installation with a shower? Is it a drop-in type? What the heck are you doing?
I'll be installing this whirlpool tub. 60"x32"
http://www.mirolin.com/english/home.php?Page=Products&Model=TA6032L/R
I think I've made up my mind and will be using cement board around the tub up to the ceiling.
If I understand it correctly, I will need:
1. cement board screws for the installation
2. cement board seam tape
My plumber will be installing the tub and completing all the plumbing. My tiler will install the tile, but I will install the cement board and drywall to minimize my costs.

Sorry, I've overspent on this renovation as it is and need to save on costs...
I have a few questions. My tub is a skirted tub with the following measurements 60"W x 32 "D x 20"H. I also have 8 foot ceilings.
The length of my wall is 60" so this entire wall above the length of the tub will be cement board.
The question I have pertains to the depth of the tub which is 32". What length of cement board should I use for this assuming tile will go past the tub by 4"? Essentially 36" of cement board will be covered by tile.
Can the portion of the cement board that is not covered by tile be mudded and feathered for priming/painting? (i.e. should I install 60"x32" and install the cement board horizontally along the depth of the tub too?)
I want to be able to tape and mud where the seams of the cement board and other moisture resistant drywall meet...
Confused...
