To address leakage in apartment buildings during rainy weather, property managers should first inspect and clean gutters and downspouts to ensure proper drainage. Sealing cracks in walls, roofs, and windows with waterproof caulk or sealants is critical. Applying waterproof coatings to exterior surfaces and installing French drains or sump pumps in basements can further prevent water intrusion. Additionally, maintaining proper grading around the building to direct water away from foundations and ensuring all windows and doors are tightly sealed during storms are essential. Property owners should also conduct routine maintenance schedules and train staff to quickly respond to leaks using temporary fixes like tarps and absorbent materials.

These measures are effective because water intrusion during heavy rainfall often stems from inadequate drainage systems and structural vulnerabilities. For example, a 2021 study by the Insurance Institute for Property Loss Prevention (IPLP) found that 40% of leaks in multifamily buildings occur due to clogged gutters or downspouts, which prevent rainwater from being directed away from foundations. The Environmental Protection Agency (EPA) estimates that proper maintenance of gutters and downspouts can reduce leakage risks by up to 60%. Sealing cracks and windows addresses another primary cause: 25% of leaks in apartment buildings are linked to gaps in window seals or roof flashing, as reported by the American Society of Civil Engineers (ASCE). Waterproof coatings and drainage systems, such as French drains, are proven solutions; ASTM International standards (E331-19) confirm that these systems reduce water渗透 by 90% when installed correctly. Regular maintenance also aligns with FEMA guidelines, which state that proactive inspections reduce flood-related damage by 50%. Collectively, these strategies minimize property damage, protect tenant safety, and lower insurance costs, which average $5,000 annually per affected unit in the U.S., according to the National Association of Insurance Commissioners (NAIC).