Regrouting makes sense when the tile itself is solid and well-adhered, but the grout is cracked, stained, or deteriorating. If tiles are loose, hollow-sounding when tapped, or shifting under pressure, the issue is usually below the surface and regrouting alone will not fix it.

You also want to look for signs of moisture intrusion, such as soft drywall behind a shower wall, dark staining that returns quickly after cleaning, or persistent mildew smells. Regrouting addresses failing grout joints, not structural or waterproofing failures behind the tile.

Grout failure is typically caused by movement, moisture, or improper curing. Movement happens when the subfloor or wall backing flexes, especially in bathrooms where humidity levels fluctuate. Discoloration often comes from trapped moisture, improper sealing, or cleaning products that slowly break down the grout surface.

It’s also common for grout to cure unevenly if the space wasn’t properly ventilated during installation. The result can be blotchy color or powdery joints that wear down faster than expected.

Floor tile needs to handle weight, foot traffic, and cleaning. That means paying attention to slip resistance, thickness, and the tile’s rating for floor use. Wall tile does not carry the same load requirements and can be thinner or more decorative.

Porcelain is typically more durable and moisture-resistant than many ceramic options, especially for wet areas. Larger format tiles reduce grout lines, which can make cleaning easier, but they require flatter surfaces to install properly. The right tile depends on location, use, and the condition of the substrate underneath.