Complete adhesive coverage is critical on large tiles 12 in.
Tiling over existing tiles in shower.
When there is a double thickness of tile it is much harder to disguise.
At diy doctor we use double glazing plastic trim to hide these edges.
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If the tiled area is 95 free from hollow sounds it is good for tiling over.
When this occurs moisture will continue to build up threatening the plaster and dry lining which lies behind the tile.
For the sake of a few hours work i would take them off.
Tiling over tiles can make it awkward i e.
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.
Layer newspaper on the floor across the bottom of the tiled wall.
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.
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.
If the tiled area has drummy tiles they have to be pulled out and replaced before the tiling over work starts.
When you are tiling over tiles however you will always have one section of edges that shows.
If your old tiles are loose drummy lifting too uneven or badly damaged they are better off removed.
Mix degreasing cleaner with water in a bucket using a dilution recommended by the cleaner manufacturer.
Scrub the wall tiles with diluted degreasing cleaner and a nylon scrub brush.
Don t worry if you do pull a bit of plaster when stripping the tiles as it s easy enough to replace.
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.
Tiling on tiles like this will not improve the problems.
Tile on tile or as i say it.
Or larger and even more important when you re tiling over tile.
Moisture and steam from your shower can easily creep behind these tiles.
It could even lead to mould growth.