Fasten hardiebacker 1 4 board with corrosion resistant screws or galvanized roofing nails 8 inches apart.

Tile on plywood subfloor. Trowel out bed of unmodified thinset over wooden subfloor. Uncoupling membranes aren t recommended for tiles smaller than 2 inches square and should not be used when covering old hardwood flooring due to adhesion problems. 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. Tape joints with alkali resistant cement.

Thinset is the wet base that you first trowel on the plywood to make the tile. Exterior grade plywood is the preferred subfloor under tile rather than osb since it deflects less and is more resistant to water and moisture. The best method is to refasten the subfloor then add a layer of plywood. A plywood subfloor should be a minimum of 5 8 thick depending on joist spacing topped by 1 2 cement backer board.

Use the right. A 3 4 inch plywood subfloor on a joist structure with 24 inch spacing needs the extra thickness of cementboard or the floor will flex and the tiles will crack. While tile can be laid on plywood do not install tile directly onto.

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