Above the lip of the tub.
Tiling around a bathtub lip.
Check if you need to adjust this mark to avoid laying slivers of tile at the top and bottom.
The cement board must be.
Secure the cement board.
This video will show you how to set tile around a tub.
I am tiling a greenboard wall above a bathtub.
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.
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.
Apply it to the wall with the bottom edge about 1 4 in.
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.
I cover some of the specifics of how to layout and set up a tub to install tile around it.
Mark a horizontal line around your bath at this height.
Unless there is already a backer board installed you must place a cement board.
Place the cement board.
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.
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.