A hollow sound under a tile occurs when there is an air pocket or a void in the thin-set mortar layer beneath it. While this is often a result of improper troweling technique or insufficient mortar coverage during the initial installation, it does not necessarily mean the tile is loose or about to detach. Some tiles, particularly those installed on certain substrates or over sound-proofing membranes, may naturally produce a different acoustic response than those installed directly on concrete. However, if the hollow sound is accompanied by movement, grout cracking, or the tile shifting underfoot, it is a strong indicator that the bond has failed. A professional installer can perform a tap test or inspect the floor to determine if the void is extensive enough to warrant a repair. If the tiles are not showing signs of failure, such as rocking or cracking, they may remain stable for years. If the void covers a significant percentage of the tile's underside, the risk of future cracking increases, making a professional assessment a wise investment to avoid more extensive damage later.
Key considerations
- hollow sound tile
- is my tile loose
- tile mortar coverage
- Mortar Coverage
- Hollow Tile
- Installation Quality