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.
Tiling over tiles can make it awkward i e.
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.
It could even lead to mould growth.
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.
Mix degreasing cleaner with water in a bucket using a dilution recommended by the cleaner manufacturer.
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While tiling on tile is a great solution for outdated tiles it s no solution for an existing tile job with issues.
Damaged tiles or tiles that are literally lifting off your floors or walls provide the perfect entry for water.
Layer newspaper on the floor across the bottom of the tiled wall.
When there is a double thickness of tile it is much harder to disguise.
Extra thickness when tiling around shower fittings.
Tile on tile or as i say it.
Scrub the wall tiles with diluted degreasing cleaner and a nylon scrub brush.
If the tiled area is 95 free from hollow sounds it is good for tiling over.
Moisture and steam from your shower can easily creep behind these tiles.
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.
Some installers prefer to flatback each tile with the flat edge of the trowel before applying the tile to the combed thin set.
At diy doctor we use double glazing plastic trim to hide these edges.
For the sake of a few hours work i would take them off.
Then rinse the wall with a water dampened.
If the tiled area has drummy tiles they have to be pulled out and replaced before the tiling over work starts.
Or larger and even more important when you re tiling over tile.
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.
When this occurs moisture will continue to build up threatening the plaster and dry lining which lies behind the tile.