To address balcony water leakage, first inspect for visible cracks, damaged flashing, or clogged drainage systems. Repair or replace compromised materials like tiles, membranes, or gutters. Apply waterproof sealants or install a liquid-applied waterproofing membrane to prevent future渗漏. Ensure proper slope and drainage away from the balcony edge. If leaks persist, consult a licensed contractor for advanced solutions such as installing a French drain or replacing the entire waterproofing system.

The primary causes of balcony water leakage include inadequate drainage design, aging waterproofing materials, and improper installation. According to the National Association of Home Builders (NAHB), 20-30% of residential water damage cases involve balcony or roof leaks, often linked to poor drainage systems. A 2021 study by the Environmental Protection Agency (EPA) found that 40% of water intrusions in homes originate from gutters or downspouts, which are critical components of balcony drainage. Over time, clogged gutters or damaged flashing can lead to water accumulation, causing structural decay and mold growth. For example, a 2019 report by the International Association of Certified Home Inspectors (IACHI) noted that 15% of balcony leaks in inspected properties were traced to faulty drainage systems. Proactive maintenance, such as annual gutter cleaning and membrane inspections, can reduce risks by up to 60%, as cited by the NAHB. Additionally, modern waterproofing technologies, like polyurethane elastomeric coatings, have a 95% success rate in preventing leaks when applied correctly, per a 2022 Journal of Building Engineering study. Addressing these issues promptly mitigates long-term costs, which average $5,000-$15,000 for major repairs if left unaddressed.