This is the case so much of the time that when people tell me on the phone that.
Tile over mud wall tile.
Then rinse the wall with a water dampened sponge.
Put up the new 4x4 tiles with wall adhesive grouted and have had zero problems.
Wash the wall with tsp tri sodium phosphate or an ammonia based cleaner to remove any grease or oil.
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Tiles falling off the wall.
Repair any loose or cracked tiles.
Whether wall or floor tile that tile needs to thoroughly stick to its base surface demands placed on tile adhesive are both extensive and steep.
By far the most common problem i have encountered has been tile installed over drywall in shower wet areas.
Remove the tile and prepare the wall according to the corresponding instructions above or tile over the existing tile.
Otherwise you do.
It cannot cure too fast.
Tiling over an uneven surface will give you less than stellar results so level out any globs of dried grout with a sander and secure loose tiles with fresh tile adhesive before beginning the.
Suitable sub floors for thick set tile installations include concrete slabs and properly installed wood.
If existing tiles are beyond repair remove the tile and install a piece of wallboard in its place.
Tile adhesive is expected to hold the tile in place not just for years but for decades without fail.
Tile on tile or as i say it.
My areas include behind the sink stove and several counter areas.
Versabond lft fortified medium bed mortar is a general versabond lft fortified medium bed mortar is a general purpose economical polymer modified medium bed mortar for use with large format porcelain ceramic and natural stone tile.
It must be easy to work with and it must adequately fill in gaps between the tile and the substrate.
And it lasts for 20 years.
Scrub the wall tiles with diluted degreasing cleaner and a nylon scrub brush.
The mortar bed sits over the sub floor and provides a smooth and stable base for the tile installation.
With a non slumping formula to eliminate lippage versabond lft can be applied to 3 4 in.
To do so make sure all of the tiles are intact and secure.
19 mm thick on horizontal applications.
Layer newspaper on the floor across the bottom of the tiled wall.