Cement board detail 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.
Transition from wall tile to bathtub lip.
To tile around a tub or shower start by measuring the height of the back wall from the lip of the tub to the top of the area to be tiled.
Then apply a generous amount of thin set to the bottom bathtub tile and position it 1 8 in.
The transition is directly under the bullnose tile on the edges of the shower.
Understand how your bathtub is setup.
Opposite where the faucet is i had to shim the studs to make my hardieback edge clear the tub lip.
Affiliate links bosch laser level.
Apply it to the wall with the bottom edge about 1 4 in.
Above the lip of the tub.
This issue is sitting there for a long time now and really bother me.
In this video i show you the entire process of installing tile around a bathtub.
I checked the tile grout.
Was the shower water seeped to the lip area from the bottom caulk and then travelled laterally out and wet the dry wall adjacent to the tub.
And yes you can paint right over the thinset if you need to.
How to tile a tub surround 1.