Tiles sound hollow or detach after occupancy.
Use the site evidence to agree a project-specific method with the responsible engineer, concrete producer, manufacturer or specialist applicator.
Tiles sound hollow or detach after occupancy.
Lift representative tile to inspect adhesive coverage, substrate, cure and movement joints.
Insufficient coverage, contamination or incompatible adhesive can reduce bond.
Repair substrate and reinstall with adhesive rated for tile type, size and exposure.
Key adhesive into substrate, use suitable trowel and back-buttering where required.
Check coverage and bond on trial area before full reinstatement.
Do not assume grout will bond a loose tile to the slab.
References inform the topic; they do not endorse a specific product for this project.