A quality unmodified thinset should be used and mixed with a latex additive.
Glue ceramic tile to 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.
However the floor must be properly reinforced to minimize flexing.
If you are working in an interior setting in a dry area where the tile will never come into contact with water you can install the tile directly onto the face of the plywood so long as you use the proper type of thinset.
The silicone or urethane adhesives should work too but the thin set mortars are easier to work with and easier to get full adhesive contact between the tile and its substrate.
Unscrew register covers and save the screws.
Find the ratio of water to dry mortar and reduce to the smallest amount you can use in 20 minutes.
Add the dry mortar to the bucket along with any liquid additives recommended by the manufacturer.
One example would be to use laticrete s 317 thinset mixed with laticrete 333 liquid latex additive.
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.
How to glue tile to wood.
There are two materials commonly used for laying ceramic on plywood or osb that are applied before the tile.
Level the surface using a wood filler.
Fill in all large gaps and holes as these will prevent proper adhesion of the tiles.
Slowly add in the.
Remove any obstacles from the installation area.
Higher latex content is essential for bonding to plywood.
Thin set dries quickly and it must be.
Thinset is the wet base that you first trowel on the plywood to make the tile stick.
Unscrew switch plate and outlet covers and set aside.
Concrete board concrete board also called backer boardcomes in 1 4 and 1 2 thicknesses and is usually sold in 4 x 6 sheets.
The joists if they re 2x8 newer code and not 2x10 older code must be braced every four feet with cross braces which minimizes independent flexing of each joist and the subfloor above.
How to bond tile to wood.