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While tiling on tile is a great solution for outdated tiles it s no solution for an existing tile job with issues.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