can use a membrane
There is a membrane product that came out in the US about 5-7 years ago. The membrane can be put over most floors before the tile. I do not remember the name of it, but Home Depot carries it in the tile dept. It is Orange in in color, comes in rolls and looks like the old "waffle padding" they use under wall-wall carpet in the 60's. The company in DE that put our floor in said that is all they use on wood or concrete. Our floor has been down about 3 years. Looks good so far!
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