Tiling over tile is usually a much easier and cheaper solution than pulling up your original tiles and re tiling your floor or wall.
Tiling over existing shower floor tiles.
If the original tile is still in excellent condition then it is possible to install tile over tile but the proper steps must be taken in order to complete the project correctly.
And it lasts for 20 years.
Tile on tile or as i say it.
Many shower floors have cut tile with sharp or rough looking edges.
Tile is covered with a smooth finish that prevents anything from getting through to the surface.
Available at stores like home depot and lowes these peel and stick tiles are available for less than 1 a square foot.
Step 1 clean and prepare the tile floor.
So first sweep the floor clean it with soap and water and allow it to dry.
As much as i dispise pre mixed thinset for any application as a tile professional for 15 years i must strongly advise you to not give out advice to.
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If you expect to apply an epoxy coating then you need to get the finish to a point where it can accept the coating.
Lay grout able peel stick vinyl over the existing tile vinyl peel stick flooring or vtf has come a long way from the vinyl tile flooring options that were popular in the 1980 s.
One advantage of doing this is that it is time saving.
Laying a new layer of tile over the existing shower floor can solve these issues without removing the old tile and grout.
If your old ceramic tile is worn or dated you can lay new tile right over the old and avoid the huge job of tearing out the old tile.
In fact pros do it all the time.
Tiling over an uneven surface will give you less than stellar results so level out any globs of dried grout with a sander and secure loose tiles with fresh tile adhesive before beginning the project.
If the existing shower is correctly installed there is no way that the tiles on the floor of the shower can be level as pitch from the walls to the drain is required for the water to drain.
Removing existing tile before installing new tile is recommended however sometimes old tile can be very difficult or almost impossible to remove.