Tips for Tile over Tile Installation?

QUESTION

Tile over Tile Installation - I am considering installing travertine or marble flooring over existing 8" ceramic tile. The job is less than 1000 square feet and the existing tile is very secure and level. Also, the additional height to the floor will not pose any problems. Can you please provide any tips or advice regarding this situation. I am thinking there would be a specific type of thin-set which one would need to use in order to obtain excellent adherence to the smooth tile surface.

ANSWER

ANSWER - It is an industry acceptable method to install tile over tile. The first important step is to verify that the existing tile is bonded substantially well to the substrate, since it is the foundation and your new installation and will be no better than its weakest point. Make sure there are no cracks, loose or hollow sounding tiles. Next is to scarify (grind) and thoroughly clean the surface of the existing tile to remove any contaminates (dirt, sealers, etc) that could act as a bond breaker. Then select a thin-set mortar for bonding the new tile to the old. The thin-set should be latex or polymer modified thin-set that meets ANSI A118.4 or ANSI A118.15 and  and be recommended for this application.

Go to Installation Products to find a manufacturer with the appropriate thin-set who offers at least a Single Source 10 year labor and material warranty. Be sure to install ¼” wide expansion joints at the perimeter of the installation and throughout the installation every 20 to 25 feet in each direction.

Good Luck!

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