how much subfloor is enough for ceramic tile install?

Question

subfloor is 3/4" joists are 2x10, 16" on center and span of 14"

Answer 1

The subfloor as you describe it is sufficient for ceramic tile. The tile can be installed in a couple of methods, either a thin set method or a mud set method. With a thin set method the tile is glued directly to the subfloor, with a mud set you would first put down a 3/4" cement base and glue the tile to the cement base.

Answer 2

If you want a long-lasting trouble free install, you need to put down cement backer board, at least 1/4" thick, preferably 1/2" thick. You want to make the base as sturdy as possible to prevent movement in the floor, which creates loose or cracked tyles. You should use thinset to glue the backerboard down & screw it to the floor joists. This is more work & expense initially, but will make the floor last forever with no problems.

Answer 3

To lessen the chance of cracking of the tile later on, use a backer board - find this at any home improvement/hardware store. These are usually available in 2 thicknesses. The thicker would be best in your situation. Follow the instructions for screw spacing when putting these down.

Answer 4

go with a a full inch of plywood,though you could get away with 3/4