Divide the dimension in half and make a mark there.
How to install ceramic wall tile around a bathtub.
Check if you need to adjust this mark to avoid laying slivers of tile at the top and bottom.
For a tub surround only install the backerboard and tile 12 inches above the tub.
Apply it to the wall with the bottom edge about 1 4 in.
Then apply a generous amount of thin set to the bottom bathtub tile and position it 1 8 in.
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.
When tiling around a tub mark the first layout line at the vertical edge of the tile next to the tub.
This video will show you how to set tile around a tub.
I cover some of the specifics of how to layout and set up a tub to install tile around it.
Fill the gap between the tile and the tub with caulk.
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.
Follow the order shown in the diagram to snap the rest of the lines.