I cover some of the specifics of how to layout and set up a tub to install tile around it.
Transition from wall tile to bathtub lip.
This kohler acrylic tub is thick the flange is more than a 1 2 thick if you run the cement board over the flange and the tile which is about 1 2 thick when thinsetted it will come too far into the tub.
This issue is sitting there for a long time now and really bother me.
Then apply a generous amount of thin set to the bottom bathtub tile and position it 1 8 in.
Apply it to the wall with the bottom edge about 1 4 in.
As with any other gap near your bathtub you ll want to close the opening to prevent any possible water damage or the onset of mold and mildew.
I checked the tile grout.
Similar to the gap that can exist between your wall tile and tub you may have a space between the floor and your bathtub.
This gap may widen over time as your home shifts.
This video will show you how to set tile around a tub.
The best approach when installing cement board or other tile backer around a tub is to keep the cement board out of the lip area.