A layer of underlayment (lauan or other special plywood, $12 to $20 per 4 x 8-ft. sheet) should be installed over wood floors to create a smooth, clean surface for the tile. Underlayment is ...

Read more: 10 Ways To Bring Old Hardwood Floors Back To Life To prepare a plywood subfloor for a tile layout, you'll want to make sure its surface is level. Use a large level or a 4-by-6-foot ...