Lay down a vapour barrier overtop the concrete pad then fasten 3 4 inch plywood using a ramset to the concrete pad.
Tile over wood subfloor.
If water seeps through the tile installation to the underlayment it will not cause the wood to swell as happens with interior grade plywood.
Trowel out bed of unmodified thinset over wooden subfloor.
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.
The most current ansi standards for tile installation a108 1999 specifically exclude osb.
Fasten hardiebacker 1 4 board with corrosion resistant screws or galvanized roofing nails 8 inches apart.
Use thinset with a higher latex content.
Tips for laying tile on plywood subfloor for flooring use intervening sheets of plywood.
When used as an underlayment the plywood sheets are laid over the osb or plywood subfloor for a two layer base.
Cut the backerboard to fit the edges of the room with a carbide tipped scoring tool.
Lay down 1 2 inch thick cement backerboard over the wood subfloor or hardwood.
Install 1 4 inch cork by thin setting it to the concrete pad then installing the heating system by fastening it to.
Tape joints with alkali resistant cement.
Thinset is the wet base that you first trowel on the plywood to make the tile.
Second the strength of wood boards isn t always consistent.
Score the surface of the board.
Tape over holes and.
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.
Splits and knots create weak spots that flex and lead to cracking tile.
If you find hollows and valleys you must fill them with a self leveling underlayment.
This is not to say that tile cannot be installed reliably over an osb subfloor.
A couple options considered are.
Prepare a wood subfloor for tile a successful tile installation project requires a level surface.
While tile can be laid on plywood do not install tile directly onto.
Check for dips in the floor by sliding a 4 foot to 6 foot straight edge in different directions all around the room.
The compound must be allowed to dry completely before proceeding with tile installation which can be anywhere from 24 hours to a few days depending on the brand.
However there is significant debate in the tile industry regarding the conditions necessary for a long lasting successful installation.
First changes in humidity make solid wood shrink swell and cup more than plywood.