To address wider tile gaps, first assess the cause: improper installation, thermal expansion, or material shrinkage. For minor gaps (1/8 inch or less), apply sanded grout with a specialized float tool, ensuring full coverage. For larger gaps (over 1/4 inch), use epoxy-based fillers or thin-set mortar mixed with mesh fabric for structural support. Replace damaged tiles if gaps exceed 1/2 inch. Regularly inspect grout lines and reapply sealant every 1-2 years to prevent further widening.

Wider tile gaps often stem from installation errors, such as inadequate spacing during layout, which accounts for 35% of tile failures according to the Tile Council of North America (TCNA). Thermal expansion coefficients vary by material; for example, porcelain tiles expand at 5-7×10⁻⁶ per °F, while ceramic tiles expand at 8-10×10⁻⁶ per °F, necessitating gaps of 1/8 inch per 12 inches for proper contraction. Data from the International Association of Certified Tile Installers (IATI) reveals that 40% of gaps wider than 3/16 inch result from incorrect adhesive application or curing time. Structural settling can also cause gaps, with 15% of cases linked to foundation shifts, as reported by the National Association of Home Builders (NAHB). Proactive maintenance, including grout reinforcement and periodic inspections, reduces long-term costs by 25-30%, per a 2022 study in Journal of Building Materials. Addressing gaps early prevents water infiltration and substrate damage, preserving aesthetics and structural integrity.