Can you lay tile on plaster walls.
Tile over plaster walls.
Testing the wall for durability.
You would have to remove the plaster and replace it not with drywall run from a contractor who says that.
You may tile over existing tile painted or unpainted drywall plaster and textured walls.
Then rinse the wall with a water dampened.
But with cement board.
Layer newspaper on the floor across the bottom of the tiled wall.
Or flatten walls with a latex modified skim coat product.
Loose paint must be scraped.
Add a diverter and shower line in the wall.
If plaster is any way compromised you should tear out to studs and start over.
This was back in the 80 s.
Both painted and bare plaster allows for the installation of tile.
Bring plumbing to code.
I have repaired tile jobs that were over 20 years old that the tile was applied directly to regular sheetrock and plaster walls.
The problem otherwise is that grout is porous and any slight crack will cause moisture and mold on any other surface.
Cover with cement board tape off.
That is true you cannot tile over plaster if that s your plan.
However tiling over tile can add quite a bit of thickness so make sure your wall can handle the weight.
It used to be very common to put tile up on whatever the wall was and seal the the tile.
Mold does not grow on cement.
Scrub the wall tiles with diluted degreasing cleaner and a nylon scrub brush.
Don t use paint glue pva wall paper paste only use the primer recommended by the adhesive manufacturer of your chosen tile adhesive.
Also now it s been plastered you will be restricting yourself to a tile with a max weight of about 16 kg m2.
Follow manufacturer instructions to a tee.
Adhesive grout and tile 20kg max weight onto plaster.
If you re not sure if you have lead paint test kits are available.