Use our guide on strengthening a wooden floor for tiling to do this.
Chipboard sealer before floor glue.
Continuous double bead on each joist where a board spans over it then you glue the groove and top edge of the tongue before knocking together.
Seal the particleboard well with a shellac sealer.
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Depending on the amount of movement and deflection you may need to strengthen the substrate before tiling.
Just be careful when the boards are butted tightly together as the adhesive is likely to foam out of the board joint.
Grout with granfix maxigrout flexible in your choice of colour.
What you may need for the job.
Seal the floor using granfix acrylic bonding agent and allow it to dry.
Let the sealer dry according to the manufacturer s instructions.
Strengthening the substrate will decrease the amount of movement associated with timber and non tongue and groove floorboards and chipboard.
If your floor passes the two fat men test proceed as follows.
Ensure the entire joint is bonded and then move on to the next row of joists.
Abrade sand the floor to remove wax dirt etc especially with green chipboard.
You can do this either by covering with a 10mm layer of weberfloor flex 6mm tile backer board or 15mm plywood.
Diy advice please sealing a chipboard floor.
Apply the adhesive directly to the groove and shoulder of the profile joint.
This is normal just leave it to dry for a while as this will help enhance the protection of the joint.
I want to seal it before laying down self adhesive vinyl tiles.
Roll it on with a paint roller and make sure you cover all areas of the board.