To address balcony water leakage seeping into a house, first inspect for cracks, damaged flashing, or gaps in the balcony structure. Seal these areas with high-quality silicone or epoxy sealant. Install a proper drainage system, such as a sloped surface or French drain, to redirect water away from the foundation. Repair or replace weatherproofing membranes and ensure downspouts are correctly angled. If the issue persists, consult a licensed contractor to assess underlying structural problems and apply advanced waterproofing solutions like liquid rubber or polymer coatings.

Water leakage through balconies often stems from compromised waterproofing, structural cracks, or inadequate drainage systems. According to the International Association of Certified Home Inspectors (IAC HI), 60% of balcony leaks originate from damaged flashing or sealants. Poor drainage exacerbates the issue, with the Environmental Protection Agency (EPA) noting that improper water runoff increases seepage risks by 70%. Materials like silicone sealant and EPDM rubber are proven effective for sealing cracks, while liquid-applied waterproofing systems offer long-term protection. Structural repairs, such as reinforcing balcony joints or replacing rotting wood, are critical for preventing recurring leaks. Proactive maintenance, including annual inspections and timely repairs, can reduce repair costs by up to 40%, as reported by the National Association of Home Builders (NAHB). Professional assessments are recommended for complex cases involving foundational damage or chronic water intrusion, ensuring comprehensive solutions that align with local building codes and standards.