It could even lead to mould growth.
Tiling over existing tiles in shower.
Or larger and even more important when you re tiling over tile.
Scrub the wall tiles with diluted degreasing cleaner and a nylon scrub brush.
Extra thickness when tiling around shower fittings.
Others prefer to use a larger notched trowel 1 2 x 1 2 in to apply the thin set.
Tiling on tiles like this will not improve the problems.
If the tiled area is 95 free from hollow sounds it is good for tiling over.
When there is a double thickness of tile it is much harder to disguise.
Then rinse the wall with a water dampened.
Mix degreasing cleaner with water in a bucket using a dilution recommended by the cleaner manufacturer.
And it lasts for 20 years.
Don t worry if you do pull a bit of plaster when stripping the tiles as it s easy enough to replace.
For the sake of a few hours work i would take them off.
Tile on tile or as i say it.
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.
Layer newspaper on the floor across the bottom of the tiled wall.
If your old tiles are loose drummy lifting too uneven or badly damaged they are better off removed.
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When this occurs moisture will continue to build up threatening the plaster and dry lining which lies behind the tile.
Before you begin tiling over tile conduct a thorough assessment of the base layer to pinpoint any surface irregularities which can cause foundational problems down the road.
Some installers prefer to flatback each tile with the flat edge of the trowel before applying the tile to the combed thin set.
Moisture and steam from your shower can easily creep behind these tiles.
At diy doctor we use double glazing plastic trim to hide these edges.
Tiling over tiles can make it awkward i e.
Complete adhesive coverage is critical on large tiles 12 in.
If the tiled area has drummy tiles they have to be pulled out and replaced before the tiling over work starts.
Normal tile trim is ideal for hiding the cut or unsightly edges of tiles.