Tile can be placed over Cresdek following the installation of a tile backer such as Hardibacker. Another alternative to installing tile directly over particleboard, plywood or OSB floor decking is to use Dal Tile's Dal Lath system. This system has been tested and approved by Dal Tile on Cresdek. You can also contact the Manufacturer of Cresdek directly, Hambro Forest Products, Inc., Crescent City, CA directly at 707-464-6131 for a copy of recommended installation instructions for all floor coverings applied over Cresdek or Cres-X floor decking. Ask for Mr. Dan Davis. All types of floor covering is applied over Cresdek and has been since the product was introduced in 1964. You will find the factory very helpful in assisting you.