This assumes that the floor underneath is solid concrete and that there are no cracks in the existing tile indicating underlying problems in the concrete.
Tiling over existing shower wall tile.
This will guarantee your tiles to stick over pretty much anything.
This essentially means laying a new layer of tiles over the old layer.
Remove the faucet handle face plate spout and shower head.
Then rinse the wall with a water dampened.
This isn t especially problematic if the pan was installed separately from the shower walls but it can be tricky if the pan is part of a one piece fiberglass stall and it may need professional expertise.
Instead of removing the old tiles you can often update them by tiling over tiles.
This gives the tub surround sealant a stronger hold.
Let this dry before moving on.
But this isn t always the case.
Skim coat over your existing tile.
Typically screws secure each of these items in.
If your old ceramic tile is worn or dated you can lay new tile right over the old and avoid the huge job of tearing out the old tile.
Mix degreasing cleaner with water in a bucket using a dilution recommended by the cleaner manufacturer.
How to install a shower surround over existing tiles step 1.
The proper way to tile over a fiberglass shower pan is to remove the pan.
Layer newspaper on the floor across the bottom of the tiled wall.
Scrub the wall tiles with diluted degreasing cleaner and a nylon scrub brush.
My fil uses and recommends laticrete 272 mortar mixed with 333 additive.