Layer newspaper on the floor across the bottom of the tiled wall.
Adding tile to existing tile.
If so check out the classes at home depot lowes might also have them for tile installation.
Scrub the wall tiles with diluted degreasing cleaner and a nylon scrub brush.
It had the same rustic feel.
Sounds like this is a new adventure for you.
It was relatively solid looking.
A couple other considerations are the on center o c spacing of the trusses.
Roughen the tile with 80 grit sandpaper.
Hold the tile close to your device until they connect it should take about ten seconds.
By adding cement board and tile to the floor you will be increasing the top chord dead load.
Grind them down with a grinder.
Out of all the tiles my client had collected this one was the clear winner for these reasons.
Lay a level on the old tile and mark any high spots.
It did not look like we had tried to match the existing tile and failed.
Then rinse the wall with a water dampened.
Mix degreasing cleaner with water in a bucket using a dilution recommended by the cleaner manufacturer.
Your shower tile is surface mount so you can simply remove the trim piece at the point you want to start the subway tile and butt it into the existing square tiles.
Tile loads are usually higher than 10 psf so chances are your trusses were not designed to account for this.
On the add a device page choose tile for tile partner products follow the prompts on your device press the button on your tile device and listen for the tune.
It was 13 x 13 the exact same size as the old tile.