Not all plaster wall surfaces will support the tile properly.
Tile over plaster wall.
You should not tile over wallpaper glossy surfaces lead paint or plywood.
Gotall10 posted in general discussion on november 2 2010 08 23am i plan to put up tile in the bathroom as a tub surround.
Tile over plaster wall.
Add a diverter and shower line in the wall.
Or flatten walls with a latex modified skim coat product.
Testing the wall for durability.
If you re not sure if you have lead paint test kits are available.
You may tile over existing tile painted or unpainted drywall plaster and textured walls.
If i aggressively sand or even strip the paint can i apply the tile over the plaster.
However tiling over tile can add quite a bit of thickness so make sure your wall can handle the weight.
Bring plumbing to code.
The wall is plaster lathe and is good condition.
Cover with cement board tape off.
Loose paint must be scraped.
Both painted and bare plaster allows for the installation of tile.
If plaster is any way compromised you should tear out to studs and start over.