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... http://49000.kr/shop/list.php?ca_id=20