I am renovating my kitchen and bathroom. My house was built in 1952. I will be installing ceramic floors in both. I have 5-1/2 x 3/4 tongue and groove boards running diagonally and nailed to the floor joists.
If I use 3/4" t&g plywood followed by 7/16" cement board and then tile my floor will be too high. What is the best method to prep for tile?