Loose areas on an existing plywood subfloor can cause peel and stick tiles to lift over time.
Ceramic tile directly on plywood.
No matter how firm the subfloor.
Installing tile directly on the plywood can damage the plywood and your tile both.
While some types of plywood can be used in certain types of tile installations use of the material has limitations.
Clean and heavily score area to where tiles are to be fixed it sounds like the adhesive does not have a rough surface in which to secure itself to.
A number of different types of substrate are used for tile including plywood.
Be mindful to use intervening sheets of plywood before putting tiles on it.
It is more important as a subfloor than anything else.
So it is better to put sheets of plywood before placing the tile on it.
Ceramic tile doesn t expand contract nearly as much.
While most floor tile these days is installed onto a layer of cement board or similar backerboard it is possible to lay tile directly over plywood.
Under british standards bs 5385 part 1 plywood has now been excluded as a suitable substrate material for the direct fixing of wall tiles therefore when tiling on to walls a tile backer board is required however tiling onto plywood floors is still acceptable under british standards.
If you re installing new plywood use galvanized screws to fasten it and countersink the screw heads.
As the plywood or osb expands the ceramic won t.
For wall installations your real concerns are whether you want to use thinset directly on the wood and whether you are using an exterior or interior type of plywood.
To be sure maybe drill up to 6 evenly spread out holes in the plywood at least 4mm deep or straight through in the areas to be tiled so the adhesive sinks into the holes and hardens hence creating a stronger fix.
For the best results when tiling onto plywood floors follow these instructions.
You may also want to tile an outdoor shed or tile plywood boards for display.
But a number of precautions must be taken to ensure a successful installation.
Glue called mastic is the least expensive method for installing tiles.
The plywood will expand and contract at a different rate as the tile causing cracks to develop in the grout lines or tiles over time.
Plywood and osb expand and contract with humidity and temperature much more than ceramic tile.
Regular seasonal humidity shifts are significant enough to make the average 10 x 10 wood subfloor floor expand or contract as much as 1 2.
Backerboard can double the thickness of an installation which can be troublesome in some locations.
While you can lay tile directly over a concrete slab using thin set adhesive don t make the mistake of applying tile directly to a plywood subfloor.
Using intervening sheets of plywood.
