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How Can I Identify Hollow Tiles?
Updated: 15.07.2026
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By tapping; a hollow tile produces a different, more hollow sound and needs to be repaired or removed.
Detailed answer
Hollow tiles are most commonly identified by tapping. A firmly bonded tile sounds solid, whereas a hollow one produces a more empty, ringing sound. Such areas are risky because the tile may loosen over time and cause issues in the new layer of microcement. It is best to remove, re-bond, or locally repair hollow tiles before application.
Common mistakes
- applying on dusty or unstable substrates
- skipping checks for hollow areas and cracks
- insufficient degreasing and priming
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