Mark the tile where it overlaps the installed.
How to wall tile on plywood.
You want the tile adhesive to have something to grab onto.
While tile can be laid on plywood do not install tile directly onto the plywood subfloor itself.
Measure perimeter tiles by laying the tile flat on the surface so that it touches the edge and overlaps the last full size tile installed on a row.
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.
Use thinset with a higher latex content thinset is the wet base that you first trowel on the plywood to make the tile stick.
Sand with a medium grit sandpaper to create a uniform surface that s not too smooth.
If possible you should always use concrete board underlayments rather than plywood.
Seal the walls with a skim coat and let it dry thoroughly.
The preferred method for tile installations is to use a sheet of underlayment.
Then you want to install screws into the concrete board in each of the holes.
Use intervening layers of two sheets of plywood.
If you are tiling on a plywood floor with tiles above 400mm x 400mm in size or heavier tiles made of stone we recommend using an ultra flexible adhesive s2 such as bal fast flex.
You cannot install tile directly onto plywood because it is not dimensionally stable.
For wall installations plywood is overkill beneath the concrete or fiber board which is designed in five eighths inch material for wall settings.
Arrange the pieces so backer board and plywood joints don t align.
Spread thinset adhesive with a 1 4 inch notched trowel over the plywood subfloor.
Set the pieces of backer board into the adhesive.
Thoroughly vacuum the area and give the wall a once over with a damp sponge or cleaning cloth.
To install the concrete board apply tile adhesive to the back then press it down against the plywood.