It could even lead to mould growth.
Tiling over existing tiles in shower.
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.
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 has drummy tiles they have to be pulled out and replaced before the tiling over work starts.
When there is a double thickness of tile it is much harder to disguise.
Tiling over tiles can make it awkward i e.
When this occurs moisture will continue to build up threatening the plaster and dry lining which lies behind the tile.
Normal tile trim is ideal for hiding the cut or unsightly edges of tiles.
Tile on tile or as i say it.
For the sake of a few hours work i would take them off.
While tiling on tile is a great solution for outdated tiles it s no solution for an existing tile job with issues.
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.
Tiling on tiles like this will not improve the problems.
Scrub the wall tiles with diluted degreasing cleaner and a nylon scrub brush.
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.
Damaged tiles or tiles that are literally lifting off your floors or walls provide the perfect entry for water.
When you are tiling over tiles however you will always have one section of edges that shows.
Mix degreasing cleaner with water in a bucket using a dilution recommended by the cleaner manufacturer.
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.
At diy doctor we use double glazing plastic trim to hide these edges.
Complete adhesive coverage is critical on large tiles 12 in.
And it lasts for 20 years.
Then rinse the wall with a water dampened.