Trowel out bed of unmodified thinset over wooden subfloor.

Tile over wood subfloor. Place hardiebacker in staggered pattern so no four corners meet. Thinset is the wet base that you first trowel on the plywood to make the tile. Lay down 1 2 inch thick cement backerboard over the wood subfloor or hardwood. 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.

First of all tile definitely should not be put down over a wood sub floor. Tips for laying tile on plywood subfloor for flooring use intervening sheets of plywood. It is an orange colored membrane designed as a backer for tile. Fasten hardiebacker 1 4 board with corrosion resistant screws or galvanized roofing nails 8 inches apart.

Installing over existing tile before installing ceramic tile over the existing tile you will need to roughen the existing ceramic tile surface to produce a better grip for the new ceramic tile. Use thinset with a higher latex content. Second the strength of wood boards isn t always consistent. If the tile is being installed in a bathroom consider applying an isolation membrane over your wood subfloor to further protect against expansion and contraction.

Splits and knots create weak spots that flex. Use the right. Tape joints with alkali resistant cement. First changes in humidity make solid wood shrink swell and cup more than plywood.

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