Layer newspaper on the floor across the bottom of the tiled wall.
Tile over tile in bathroom wall.
Roughen the tile with 80 grit sandpaper.
Scrub the wall tiles with diluted degreasing cleaner and a nylon scrub brush.
Always stagger your joints when putting new tiles onto old tiles what to do at the edges where double thickness of tiles show.
Then rinse the wall with a water dampened.
New tiles on top of old tiles the new tile joints are highlighted in red.
Very easy diy that will save you hundreds of dollars not paying a contractor.
You can tile over tiles with the right preparation but i would never do this the proper way is to strip right back to original wall finish.
And it lasts for 20 years.
Tile on tile or as i say it.
If your old ceramic tile is worn or dated you can lay new tile right over the old and avoid the huge job of tearing out the old tile.
Bjd building roofing say.
Grind them down with a grinder.
Original tiles on wall the existing tile joints are in yellow.
Learn the largest tile industry secret to remodel your bathroom for just 200 bucks and 1 days work.
Mix degreasing cleaner with water in a bucket using a dilution recommended by the cleaner manufacturer.