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    • #10548
      Gina Wanick
      Guest

      I have alot of used 12×12 floor tiles with the concrete
      left on the back. Do I have to remove the old concrete,
      or can I leave it on. It would take forever to chip it
      off.

    • #76381
      the warm floor center
      Guest

      yes you should. the tile will be harder to install
      and will not set level.
      rjb

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