How to Install Ceramic Tile on a Tile Floor

Before you can install new ceramic tile over existing ceramic tile, you’ll need to do some surface preparation.

The first step is sanding the old tile with 100-grit paper to rough up the surface.

Next, apply a bonding primer to the surface. We’re using Custom Building Product’s Multi-Surface Bonding Primer.

To fill the grout joints in the old floor, mix up a floor-leveling compound like LevelQuik. This material is a relatively thin liquid when it goes on, so it will flow into the low places and level itself.

Trowel it over the old tile to fill in the grout joints so that once it’s dry, you have a completely flat, level surface across the whole bathroom.

From this point, the process is much like any ceramic tiling. Chalk layout lines along the longest dimension of the room and begin applying thin-set mortar with a notched trowel. The thinset acts as a glue to secure the tiles to the floor.

The chalk lines and plastic spacers help maintain straight lines and consistent spacing.

Once the tiles are in and dry, apply the grout with a rubber float before we clean off the excess material, revealing our new finished tile floor.

Further Reading



  1. Applying a new ceramic tile over the existing tile floor is amazing and wakes up the diy initiative. I am curious whether the new floor will be too elevated for a door jam to remain flush with the adjoining, carpeted bedroom. What do you think? What sort of clearance is needed?

    • Hi, Susan!
      This is a concern — there are tapered thresholds that address this concern but it depends on the individual situation as to how well they work.
      Good luck!

  2. How do you deal with raising the toilet “ring” that was level with the existing tile? Is there something you can buy that connects to the old ring to raise it up 1/2″ so that way the toilet can be secured via bolts (that is my main concern that the bolt hole will be too low once the new tile is over the old tile.

  3. Please tell me if I can wallpaper over existing paintable wallpaper, if not how do I remove the already painted paper.

  4. Hi Thomas,
    Thank you for sharing this video on how to install ceramic tile, I will try this style for my drywall. Thanks for the guide.


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