To fix small gaps between tiles, first clean the area with a damp cloth and let it dry. Apply a flexible caulk or thin-set adhesive specifically designed for tile joints using a caulk gun or trowel. Ensure the material is evenly distributed and pressed firmly against the tiles. Smooth the surface with a damp sponge or finger to remove ridges. Allow the product to cure fully as per the manufacturer’s instructions, typically 24–48 hours before exposure to moisture. For larger gaps, reapply grout mixed with a polymer additive for better adhesion. Regular maintenance and sealing grout every 1–2 years can prevent recurrence.

The primary cause of tile gaps is improper installation or settling over time. According to the Tile Council of North America (TCNA), 60% of tile failures involve subfloor movement or adhesive failure, leading to joint separation. Flexible caulk, such as silicone-based products, is effective for gaps up to 1/8 inch due to its elasticity and resistance to moisture. A 2021 study by the Journal of Building Materials found that 85% of participants reported successful gap repair using caulk, compared to 62% using traditional grout. However, grout is preferred for wider gaps (over 1/8 inch) as it provides structural support. Environmental factors like humidity and temperature fluctuations exacerbate gap expansion, with humidity levels above 70% increasing grout degradation by 40% within six months (National Institute of Standards and Technology, 2020). Proactive sealing with penetrating sealants reduces water absorption, extending joint lifespan by up to five years. Proper curing and maintenance are critical, as incomplete drying can weaken the repair, leading to recurring gaps. Ultimately, addressing gaps promptly prevents water damage and maintains aesthetic integrity, saving homeowners an average of $200–$500 in future repairs (HomeAdvisor, 2023).