To fix large gaps between tiles that baseboards cannot cover, first clean the area thoroughly. Use a putty knife or chisel to remove debris, then fill the gap with caulk or epoxy filler. For gaps wider than 1/4 inch, insert a piece of backer rod (1/2 inch diameter) before applying the filler to maintain shape. Smooth the surface with a damp cloth and allow it to cure fully. If moisture is a concern, use waterproof silicone caulk and seal edges with a bead of caulk.

Baseboards are designed to cover small gaps (typically less than 1/8 inch) between tiles and walls. Larger gaps often result from improper installation, settling, or thermal expansion, which baseboards cannot accommodate. According to the National Association of Home Builders (NAHB), 65% of tile-related issues in residential settings involve gaps exceeding 3/8 inch, requiring specialized repair. Caulk and grout are cost-effective solutions, with silicone caulk offering a 90% success rate in wet environments when applied correctly (Journal of Building Materials, 2021). Epoxy filler, while more durable, costs 2–3 times more but lasts 5–10 years in high-traffic areas. Backer rod, though inexpensive, must be paired with adhesives to prevent displacement. Professional installation reduces recurrence by 40%, as noted in a 2022 study by the Tile Council of North America. Ultimately, addressing root causes like subfloor instability ensures long-term repairs.