Can I Thinset Tile on Top of Tile?

Few projects can transform a room more than tile, be it ceramic, mosaic or slate. With thousands of colors and styles to choose from, the only problem you may encounter is making a final selection. While it’s always a good idea to cover existing floors with a hardboard underlayment, you can install thinset tile on top of tile. In fact, it’s a better choice because you will wind up with a flatter surface. Thinset mortar is a blend of cement, very finely graded sand and a water retention compound that allows the cement to properly hydrate -- and adhere nicely to your floor.

Trowel and rubber-surfaced trowel
Mallet
Grout
Old toothbrush
Sponge

Instructions

- 1
  Mix the thinset mortar until it resembles the consistency of peanut butter; it should be visibly thick but smooth and easy to manipulate.
- 2
  Apply the thinset to the center of the tile with a trowel and push toward the corners until the surface is evenly covered with thinset.
- 3
  Skim the surface of the tile with the trowel to ensure even coverage and remove any excess.
- 4
  Press the tile to the original tile, following any markings. Ensure that it is properly placed.
- 5
  Push down on the tile firmly with your hands only, being careful not to hoist your body weight on the tile -- or risk breaking it.
- 6
  Tap the tile gently into place with a mallet.
- 7
  Place all the remaining tiles in the same manner.
- 8
  Allow the thinset mortar the proper time to set and cure by following the directions on the package label.
- 9
  Apply grout with a rubber-surfaced trowel (if necessary for your tiles) after the tiles have set for at least 24 hours.
- 10
  Clean out the intersections with the handle of an old toothbrush until smooth.
- 11
  Wipe off the excess grout with a damp sponge.
- 12
  Cordon or block off the area from foot traffic until it is safe to walk on and enjoy.

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