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My guess is that you're trying to raise the tile to match the existing hall floor level. For my fraction-oriented friends, the material that was removed is about 1 inch thick. Foam is generally not suitable as a tile substrate. However, a direct mortar/cement bond with the concrete slab will do very well to dampen sound. There's no reason that you can't ...


No no no. You do not put a subfloor on good concrete. You are then allowing for a moisture sandwich (which is bad). Buy a modified thinset, put tiles on thinset, grout, then you are done.


wall - ceiling - floor then joint retouch

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