Is it possible to put wall tiles over exsisting ceramic wall tiles.?
Yes, they will stick. On occasions it is a helpful thing to do to get over a problem in some instsnces. However it is not professional and would not usually be done by a competent and experienced worker in the industry. You should remove all old ceramics and start with a good quality non-hollow plaster surface and re-tile as necessary. Removal can often be a dangerous and difficult job. There is a generic risk assessment for the removal of ceramics, and eye protection should be used to protect from fragments of glaze. And gloves. It is sometimes beneficial to use a wallpaper stripper to remove old adhesives and sometimes tiles, by cupping them with the steamer plate and getting the water to soak behind the tiles, although stuck fast tiles can be very stubborn.
