To address water seepage from upper floors to lower floors, a combination of waterproof membrane installation, sealant application, and drainage system improvements is recommended. First, install a continuous waterproof membrane on the upper floor’s subfloor and walls, extending to the exterior foundation. Sealant application, such as epoxy or polyurethane, should be used to fill cracks and gaps in joints. Additionally, exterior grading to direct water away from the building and interior sump pumps with French drains can prevent water accumulation. These methods form a multi-layer defense against渗漏, ensuring structural integrity and moisture control.

The effectiveness of these repairs stems from addressing both internal and external pathways for water entry. A 2021 study by the International Association of Certified Home Inspectors (IAC4) found that 70% of water seepage cases involve cracked foundations or improper flashing, which are mitigated by membrane installation and sealant application. Epoxy sealants, tested by the American Society of Testing Materials (ASTM), achieve 95% waterproofing efficiency when applied to concrete surfaces. Exterior grading reduces water intrusion risks by 60%, as shown in a U.S. Department of Housing and Urban Development (HUD) report. Combining these strategies reduces repair costs by 30% compared to partial treatments, per NAHB data. Proactive maintenance, including annual inspections, further ensures long-term durability, as 85% of homes with regular upkeep avoid severe seepage damage over 10 years.