Repair or remove unfit plaster.
Prep textured wall for tiling.
Remove any remaining dust oil or grease with tsp tri sodium phosphate or an.
If existing tiles are beyond repair remove the tile and install a piece of wallboard in its place.
How to prepare painted or textured drywall for tiling however first you should remove any signs of paint not firmly or tightly fixed in place.
How to prepare for tiling a wall.
Wash the wall with tsp tri sodium phosphate or an ammonia based cleaner to remove any grease or oil.
Get rid of any other paint with paint remover.
Sand the wall with a medium grade sandpaper to create that rough surface for the grout.
Use either a hand held sander or an electric sander.
Vacuum the wall and.
Drag the wide area of the scraper across the paint in all directions to remove as much paint as you possibly can.
Previously painted textured drywall prep.
Remove the tile and prepare the wall according to the corresponding instructions above or tile over the existing tile.
Wait for it to dry then use a filler to make it an even surface.
Repair any loose or cracked tiles.
Sand the wall with medium grit sandpaper 80 grit to further smooth the texture creating an even surface on which to apply the tile.
To do so make sure all of the tiles are intact and secure.
Make sure there is no dust or heavy particles.
Scrape away any loose or peeling paint or wallpaper.
Place a wide drywall knife on the wall at a 45 degree angle.
Get rid of or pre treat wallpaper if present repair any cracks or signs of damage.
Sand so that the adhesive can bond.
Remove old fittings such as pins screws rivets etc.