Not a good idea. The Hardi is designed to be nailed or screwed down over a wood subfloor system. You also put thinset under it to fill in the voids between the wood layer and the cement board. The Hardi gets nailed or screwed at 6" intervals around the perimeter and 8" intervals in the body of the board. Thats a lot of screws ($$$) to set into a concrete floor, about 60+ a board. The thinset under the board is IMPERATIVE and the Tapcons or Walldogs ($$$) must be set so the head is flush with the surface of the board unless you want to pour self leveling cement over the whole floor ($$$). After all that the cost of a grinding machine for the day will be under $200, but you will need help to transport it, they are very heavy. |
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