You can in areas like a kitchen back splash. Just use a mastic glue. Don't tile over drywall in areas prone to high moisture, such as a shower, tub or floors.
Ceramic tile contractors install ceramic tile floors in any room of a house, and they are specialized and do a great job. They also install other types of tiles, such as ceramic wall tiles, and ceramic countertop tiles.
The most common wall tile is simply a white ceramic tile. These tiles are extremely cheap and easy to make and install. One can purchase them at a home improvement store.
With great difficulty!
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Ceramic Tile Wall.
Bullnose ceramic tile trim is a trim that lines the tiles of your floor or wall. This trim has a bit of a curve to it, which is where the name bullnose comes from.
Very Carefully !
You can if it's smooth and really sticking to the wall well enough. In this case, I would use a mastic style glue by Mapei.
With tiles! But on a more serious note, build a frame, plaster board it, get a base tray for the water to fall into and connect it to your waste. Plaster the "boarded wall" then tile it. Then install the shower itself. Seal up then its ready to use.
You use a regular wall tile adhesive like Ecobond
Ceramic tiles come in various thickness, a 8 x 12 could be 1/8 if it's a wall tile or as much as 3/8 if a floor tile.
You should not adhere tile on top of tile. It is much better to rip it up and install on a secure surface and make sure it is smooth level. If you find yourself in a situation where you can not/should not remove the tile (e.g. if there is asbestos tile underneath or if there is a radiant heat systems under and you don't want to risk breaking/puncturing it), then the alternative is to pour 1/2" (or more) of self leveling cement and then install on top of that.