I have a Bi-level home and the family room is on a concret slab. This room, up to Floyd, had carpet on the floor. I have had to replace the carpet once befor due to water problems. When I did that I painted the floor with Dry-loc UVL. Ihave corrected the water problem but want to tile with 12" square tiles. My question is what if any thin set or other adhesive could I use, or what do I have to do to prepare the floor.