Next mix your grout and spread it into the gaps between the tiles using.
How to lay tile on plywood wall.
For wall installations plywood is overkill beneath the concrete or fiber board which is designed in five eighths inch material for wall settings.
If you put tile directly on top of plywood it will chip and break.
Unlike wood or drywall sub surfaces cement backerboard will not rot warp or grow mold and mildew when exposed to water.
Never install new tiles over existing tiles or onto an unprotected wood or plywood floor.
Space the field and edge fasteners correctly the top layer of plywood should be screwed down every 8 inches on the edge and every 6 inches in the field or interior section.
To install the concrete board apply tile adhesive to the back then press it down against the 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.
Whenever you re laying tile on a wood subfloor you need to first install cement backerboard to prevent leaks and water damage.
Then you want to install screws into the concrete board in each of the holes.
The preferred method for tile installations is to use a sheet of underlayment.
For the best results when tiling onto plywood floors follow these instructions.
Center your tile in the bathroom.
Do not install glass tile over particleboard chipboard masonite press wood plywood or asbestos surfaces.
Wall preparation keep the installation surface clean and dry.
To install ceramic wall tile use a level and measuring tape to mark the tile locations on the wall with chalk.
If possible you should always use concrete board underlayments rather than plywood.
Use long sweeping motions to apply mortar to the wall and start placing your tiles in the marked locations.
Step 4 center.
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 your drill to make this job simpler.