Shrinking and swelling will crack the grout can pop off tiles etc.
Tile on plywood wall.
Thinset is the wet base that you first trowel on the plywood to make the tile.
You should not tile over wallpaper glossy surfaces lead paint or plywood.
While tile can be laid on plywood do not install tile directly onto.
Tiling onto 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.
You cannot install tile directly onto plywood because it is not dimensionally stable.
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.
Wet areas such as bathrooms and washrooms as well as exterior settings need to use exterior grade plywood.
If you are working in an interior setting in a dry area where the tile will never come into contact with.
Tips for laying tile on plywood subfloor for flooring use intervening sheets of plywood.
Things you will need screw driver wood filler tape measure chalk line tool pencil mastic v notched trowel scraper mastic remover level rubber mallet tile cutter grout rubber grout float sponge.
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.
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.
Plywood is not dimensionally stable it can shrink swell and otherwise move around no matter how many screws are holding it in place.
As the plywood or osb expands the ceramic won t.
Ceramic tile doesn t expand contract nearly as much.
Then you want to install screws into the concrete board in each of the holes.
However tiling over tile can add quite a bit of thickness so make sure your wall can handle the weight.
Plywood and osb expand and contract with humidity and temperature much more than ceramic tile.
However tiling onto plywood floors is still acceptable under british standards.
Use the right.
To install the concrete board apply tile adhesive to the back then press it down against the plywood.
No tile pro worth his her salt would recommend to tile directly on plywood.
If you put tile directly on top of plywood it will chip and break.
You may tile over existing tile painted or unpainted drywall plaster and textured walls.