Why Are My Kitchen Tiles Cracking Near the Sink?

Water is the most common reason tiles crack near a sink. Small leaks from the faucet base, supply lines, or drain connections can send water under the tile. Over time, that moisture softens the thin-set or adhesive holding the tiles down, so they shift and crack under normal foot traffic.

The subfloor itself can also swell or rot when it stays wet. Once the base moves, the rigid tile surface has no give, and cracks appear. Look for dark grout, a musty smell, or soft spots in the floor, which are signs of moisture trapped below.

• Check under the sink for drips or dampness on pipes
• Feel the grout lines near the sink for wet or crumbly areas
• Press on tiles to find any that flex or feel hollow
• Look for a white or chalky residue, which can indicate dried water
• Run water and watch for leaks at the base of the faucet

Start by drying everything under the sink and wiping down the pipes. Then run the water for a few minutes and watch for any drips. Pay attention to the area where the faucet meets the counter and the drain connection, as those are common failure points.

If you cannot see a leak, the moisture may come from a slow drip inside the wall or from the dishwasher line. A water damage inspection can use moisture meters to locate hidden dampness without tearing up your floor. Keeping the shutoff valve location written down helps you act quickly if a leak is found.

Keep the area around the sink as dry as possible. Wipe up standing water quickly, and fix any drips as soon as you notice them. Check the caulk around the sink edge and the grout lines at least twice a year, and reseal them if they show wear.

If your home has a crawl space or basement, check for high humidity or condensation that could affect the floor above. A dehumidifier can help in damp seasons. In cold or coastal climates, being proactive about moisture can save you from bigger repairs later.