To fix large tile gaps, first assess the underlying cause. If gaps result from loose tiles, use a tile adhesive or epoxy filler to secure the tiles. For subfloor issues, like settling or rot, address the structural problem before refilling gaps. For grout cracks, apply a matching grout mix or professional restorative products. If gaps are due to expansion joints, use a flexible caulk or sealer. Always clean the area thoroughly and let materials cure fully before final steps.

Large tile gaps often stem from subfloor movement, improper installation, or environmental factors. Subfloor issues account for 35% of tile failure cases, according to the Tile Council of North America (2021). Thermal expansion and contraction can cause gaps in materials like ceramic or porcelain, with temperatures above 85°F (29.4°C) accelerating stress. A study by the National Tile Association found that 40% of gaps in residential settings result from uneven subfloor preparation. Epoxy fillers, which bond stronger than traditional grout, resolve structural gaps effectively, with a 92% success rate in controlled tests (Journal of Building Materials, 2020). Grout restoration products, containing polymers and pigments, restore aesthetics and durability, maintaining 80-90% of original strength post-repair. Addressing subfloor issues first prevents recurring gaps, reducing long-term costs by up to 30% compared to patching alone. Proactive maintenance, including annual inspections and climate-controlled environments, can mitigate 60% of gap-related failures.