Others prefer to use a larger notched trowel 1 2 x 1 2 in to apply the thin set.
Tiling over existing tiles in shower.
When you are tiling over tiles however you will always have one section of edges that shows.
Complete adhesive coverage is critical on large tiles 12 in.
If your old tiles are loose drummy lifting too uneven or badly damaged they are better off removed.
At diy doctor we use double glazing plastic trim to hide these edges.
When there is a double thickness of tile it is much harder to disguise.
Or larger and even more important when you re tiling over tile.
When this occurs moisture will continue to build up threatening the plaster and dry lining which lies behind the tile.
Tiling on tiles like this will not improve the problems.
Don t worry if you do pull a bit of plaster when stripping the tiles as it s easy enough to replace.
The best way to check the tiles for drumminess is to tap each one with the back of a screwdriver and listen for a hollow sound.
And it lasts for 20 years.
Moisture and steam from your shower can easily creep behind these tiles.
Normal tile trim is ideal for hiding the cut or unsightly edges of tiles.
Damaged tiles or tiles that are literally lifting off your floors or walls provide the perfect entry for water.
If the tiled area is 95 free from hollow sounds it is good for tiling over.
Then rinse the wall with a water dampened.
While tiling on tile is a great solution for outdated tiles it s no solution for an existing tile job with issues.
Tiling over tiles can make it awkward i e.
For the sake of a few hours work i would take them off.
Scrub the wall tiles with diluted degreasing cleaner and a nylon scrub brush.
Tile on tile or as i say it.
Some installers prefer to flatback each tile with the flat edge of the trowel before applying the tile to the combed thin set.
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Mix degreasing cleaner with water in a bucket using a dilution recommended by the cleaner manufacturer.
If the tiled area has drummy tiles they have to be pulled out and replaced before the tiling over work starts.
Extra thickness when tiling around shower fittings.