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.
Tiling around a bathtub lip.
Mark a horizontal line around your bath at this height.
This video will show you how to set tile around a tub.
Above the lip of the tub.
I cover some of the specifics of how to layout and set up a tub to install tile around it.
You may wish to alter this height if possible to minimise tile cutting.
How to install tile around a tub with a lip 1.
Then apply a generous amount of thin set to the bottom bathtub tile and position it 1 8 in.
Divide the dimension in half and make a mark there.
Use backboard screws to secure the cement board to the framing.
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.
Check if you need to adjust this mark to avoid laying slivers of tile at the top and bottom.
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.
Secure the cement board.
Fill the gap between the tile and the tub with caulk.
Apply it to the wall with the bottom edge about 1 4 in.
I am tiling a greenboard wall above a bathtub.