Grind them down with a grinder.
Tile over tile in bathroom 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.
Original tiles on wall the existing tile joints are in yellow.
Scrub the wall tiles with diluted degreasing cleaner and a nylon scrub brush.
Very easy diy that will save you hundreds of dollars not paying a contractor.
New tiles on top of old tiles the new tile joints are highlighted in red.
Bjd building roofing say.
Always stagger your joints when putting new tiles onto old tiles what to do at the edges where double thickness of tiles show.
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.
Don t worry if you do pull a bit of plaster when stripping the tiles as it s easy enough to replace.
Lay a level on the old tile and mark any high spots.
Mix degreasing cleaner with water in a bucket using a dilution recommended by the cleaner manufacturer.
Tile on tile or as i say it.
Learn the largest tile industry secret to remodel your bathroom for just 200 bucks and 1 days work.
And it lasts for 20 years.
Roughen the tile with 80 grit sandpaper.