Scratch the tile with sandpaper to rough up the surface.
Tile over existing shower wall tile.
Don t worry if you do pull a bit of plaster when stripping the tiles as it s easy enough to replace.
The surface of the existing tile should be free of mold and mildew completely level including grout and without any warping or strangely placed tiles that might otherwise interfere with a.
Then rinse the wall with a water dampened.
Grind them down with a grinder.
Mix degreasing cleaner with water in a bucket using a dilution recommended by the cleaner manufacturer.
Tile on tile or as i say it.
While tiling on tile is a great solution for outdated tiles it s no solution for an existing tile job with issues.
If your old tiles are loose drummy lifting too uneven or badly damaged they are better off removed.
Typically screws secure each of these items in.
Bjd building roofing say.
As much as i dispise pre mixed thinset for any application as a tile professional for 15 years i must strongly advise you to not give out advice to.
Most kitchen and bath supply and design stores stock bath and shower liners which can cover ugly shower tile.
And it lasts for 20 years.
Remove the faucet handle face plate spout and shower head.
Lay a level on the old tile and mark any high spots.
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.
Tiling on tiles like this will not improve the problems.
This gives the tub surround sealant a stronger hold.
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Layer newspaper on the floor across the bottom of the tiled wall.
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.
If the existing shower is correctly installed there is no way that the tiles on the floor of the shower can be level as pitch from the walls to the drain is required for the water to drain.
This option is less labor intensive than painting or replacing the tile but it s not.