I am remodeling a bathroom to install wall tile. Here is what we have done so far.
1. Removed all old wall plaster to studs (this was plaster over wallboard so did we need to tear out or could we have tiled over this)
2. Installed new plumbing fixtures and cast iron tub-then leveled
3. Installed Hardibacker board and taped joints
4. Started to fill in Taped joints with thinset
Okay, here is our questions after first listening to the home center department manager of his tile department, then tonight watching an installation video of hardibacker board.
1. Was told no vapor barrier needed due to popular use of this board and it being moisture resistant
a. if we need a vapor barrier-can I use something else as the thought
of tearing the board off is like thinking I going to get a big stimulus
2. The gap between the tub and backer board is a little more than 1/4"
a. Can I fill this gap with scrap board, then thinset, then caulk? (yes, we should have dropped the board down another 1/8" but for some reason didn't see this. I know that is where water will set so I want to fill with thinset, then caulk if this sounds agreeable.
We are ready to tile but the vapor barrier question is bugging me before I tile. Is there something to go over this before I tile that thinset will adhere too?
We are using 12x12 with 3/8 x 1/4 trowel
Thank you for your help.