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Old 08-09-2009, 08:58 AM   #1
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ceramic tile onto concrete floor

Whats up,
I just bought a home and want to put ceramic tiles in one of the rooms. I pulled up the rug and along with that came a layer of old hard tiles. Under the tiles is a concrete floor in good shape with some black glue left over from the tiles. Can I just put down thinset and tiles or do I need Ditra or Red Guard first. The floor is straight and in good shape. The only thing about the floor that I would have to prep is removing the black glue and if necessary fill in some tiny holes which are from those wooden brads when the carpet was installed.


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Old 08-09-2009, 11:54 PM   #2
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Location: Troy, Michigan
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Hi Andy,

Those old tiles were probably asphalt or vinyl asbestos tiles. Both of these types of tiles contain asbestos, and chances are that black "cut-back" adhesive contains asbestos too. When do think they were installed, when was the house built?

The recommended procedure is to cut as much as that adhesive off with a razor tool called a wallpaper scrapper, then when only a film remains, you can bond tiles or a membrane such as Ditra to it. The scrapper looks like this; http://www.core-industrial.com/manag...28Small%29.jpg Do not use solvents to remove the adhesive.

Be sure the "modified" thin set mortar says it's compatible with the cut-back. If the floor is small and has no cracks, you could skip the Ditra, but it is best to use it, or a similar product from Noble. Makes for better sleeping.



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