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Unread 01-17-2020, 11:54 AM   #4
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Join Date: Jul 2005
Location: Fairfax, Va
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Welcome, Ian.

Many challenges with using mastic, and one that springs immediately to mind is that the manufacturer of your floor warming system isn't likely going to condone using mastic with their product. And even if they did you'd have to apply it so thick that, as Jim says, it may never dry, and almost certainly not by the time you want to use it.

I've read here that some companies make a primer specifically engineered to be applied over existing ceramic tile that will allow you to use a thinset mortar to set new tile upon the old. Mapei I think is one, Laticrete might be another.

You'd have to, of course, ensure the old tile is still firmly set and that the floor is sufficiently flat for the size tile you wish to use.
If I recall correctly my memory is excellent, but my ability to access it is intermittent.
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