Use intervening layers of two sheets of plywood.
Ceramic tile over wood subfloor installation.
Lay down inch exterior plywood and screw into the 2 3 s every 8 inches.
A plywood subfloor must be structurally sound and able to support the installation.
First changes in humidity make solid wood shrink swell and cup more than plywood.
If installing over an appropriate wood surface sand the wood to make it smoother and remember that the installation will work better over a subfloor at least 1 1 8 inches thick.
Try laying tile over 1 2 durock or hardie and see what happens when the joists are 19 2 or 24 on center.
Cement backer board can provide a solid flat surface to install tiles on if you have a wood subfloor.
According to backer board manufacturers and tile setters installing backer board directly over an old solid wood subfloor is risky for a couple of reasons.
Lay down inch exterior plywood the opposite direction and screw to the inch.
Tile floors are heavy and tile is a hard material.
Laying tile on plywood.
Tile can be installed over a plywood substrate and it is actually a fantastic way to make sure you don t have deflection in your floor.
If you must install over such surfaces it is best to install a backer board over the old surface and install the tile on the backer board.
Second the strength of wood boards isn t always consistent.
Build a structure of 2x3 s with 8 inches of space between the boards.