Install Tile on Plywood?

Yes, you can install tile on plywood, but it’s not the very best base for tile installation.

Cement-based surfaces such as concrete and cement board (WonderBoard, HardiePlank, etc.) are more stable and provide a better “stick” than plywood.  But tile on plywood still isn’t bad.

If you feel uncertain at all about your plywood, then screw down cement backerboard over the whole thing.  It’s work, but it guarantees a perfect installation.

• Choose exterior-grade plywood BC.  “B” is the grade of one side; “C” is the grade of the back side.
• Use 3/4″ plywood.
• Make sure that the “B” side–smooth side–is up.  The reason you’ll be installing on exterior grade is because this type of plywood deals with water better, and your thin-set mortar will be loaded up with water.
• Already have plywood down but don’t know what kind of plywood this is?  You may be able to get in the crawlspace and see grade markings on the bottom.
• Use only complete sheets, where possible.
• This plywood must be absolutely stable and bend-free.  Any kind of “give” when you walk will transmit to your new tile, and will eventually crack the tile.
• Avoiding having the joints of the plywood lining up; stagger the joints instead.