The cement board must be.
Tiling around a bathtub lip.
The tiling scheme will largely dictate where to start tiling and how the wall should be marked out for tiles start by measuring the height from the lip of your bath to the top of the planned tiled area.
How to install tile around a tub with a lip 1.
Secure the cement board.
Divide the dimension in half and make a mark there.
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.
I am tiling a greenboard wall above a bathtub.
I cover some of the specifics of how to layout and set up a tub to install tile around it.
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.
Place the cement board.
Mark a horizontal line around your bath at this height.
Fill the gap between the tile and the tub with caulk.
I understand that the greenboard must be above the lip of the bathtub not overlapping or underlapping however using this method will create a 1 gap the length of the lip between the top of the tub minus the lip and the beginning of the drywall.
Unless there is already a backer board installed you must place a cement board.
Above the lip of the tub.
Apply it to the wall with the bottom edge about 1 4 in.