Tile over tile means exactly what it says, but in this case youre going to sandwich a layer of radiant heating mats between the old and the new tile. Tile over tile is an easy way to avoid the mess associated with tearing up the old bathroom floor, but requires thorough planning.
Deflection:
Before you install a radiant heat mat over the old bathroom tile and install new tile over the mat, you should check the floor for deflection. This is the maximum amount the floor can move under the anticipated load (you). Ceramic tile is hard and will break or dislodge if the surface bends under the load. Heres a simple test:
Stand in the middle of the bathroom floor and jump up and down. If the floor moves it has a deflection problem and is not a good candidate for tile over tile installation until you reinforce the sub-floor.
Avoid That Sinking Feeling:
Since youre tiling over tile, you must plan in advance to avoid making the vanity, toilet and tub look like theyre sinking into the new floor.
Fortunately, many of the new radiant heating mats are no thicker than the depth of the mortar you would ordinarily apply for most tile installations. ...
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