Do you need put down leverer or backer board for ceramic tile
I took tile up from that space and it has perfect grooves all the way across the space. transitions are perfect at 2 of the transitions, but one has about a 1 1/2 inch transition and that is ceramic to ceramic. the other 2 are ceramic to front door threshold, and ceramic to hardwood.
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On a plywood subfloor, you need either a layer of cement backer board or an underlayment membrane, like Schluter-Ditra, between the subfloor and tile for the thin-set adhesive to achieve a good bond. While I prefer using 1/2” cement backer board over a plywood subfloor, you may be able to get by with 1/4” backer board instead. Even if you use a waterproof underlayment membrane, such as Ditra, the floor will still be either 1/4″ or 1/2” higher than the subfloor, plus the thickness of the tile and adhesive.
When applying cement backer board over a plywood subfloor, be sure to adhere the two surfaces together with thin-set adhesive; and screw the cement backer board down with special screws that countersink into the backer board, such as Backer-On screws available at The Home Depot.
No, the layer under the tile I took up was cement with grooves in it. So I thought the thin-set that I put on a thick enough layer on the floor it would settle into the cement grooves when I layed the tile and seated it into place. Suzanne