Always stagger your joints when putting new tiles onto old tiles what to do at the edges where double thickness of tiles show.
Tile over tile in bathroom wall.
New tiles on top of old tiles the new tile joints are highlighted in red.
Tile on tile or as i say it.
And it lasts for 20 years.
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Layer newspaper on the floor across the bottom of the tiled wall.
Generally speaking thin set adhesive also known as thin set mortar is great for setting tiles in areas subject to moisture like bathrooms while mastic adhesive is best for drier spaces like.
Roughen the tile with 80 grit sandpaper.
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.
Very easy diy that will save you hundreds of dollars not paying a contractor.
Bjd building roofing say.
Then rinse the wall with a water dampened.
Grind them down with a grinder.
Scrub the wall tiles with diluted degreasing cleaner and a nylon scrub brush.
Lay a level on the old tile and mark any high spots.
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.