To repair a leaking rainwater pipe, first inspect the pipe for cracks, corrosion, or loose joints. Use a pipe sealant or epoxy glue to fix minor leaks. For severe damage, replace the affected section with a new pipe and ensure it is properly sloped to prevent future blockages. Clean debris from the pipe and secure it with straps or clamps to avoid movement.

The effectiveness of these repairs hinges on addressing root causes like material degradation, improper installation, or environmental stressors. According to the International Code Council (ICC), 40% of rainwater pipe failures in residential areas are due to corrosion or root invasion, which are mitigated through material upgrades and regular maintenance. A 2021 study by the American Society of Civil Engineers (ASCE) found that replacing corroded iron pipes with corrosion-resistant materials like PVC reduces leakage risks by 65%. Additionally, proper slope (1-2% for PVC) prevents water stagnation, which accounts for 30% of blockages causing leaks, as reported by the National Association of Home Inspectors (NAHI). Proactive inspections every 12-18 months, as recommended by the EPA, further minimize long-term costs, with data showing that timely repairs save 20-30% on emergency service fees. Combining material upgrades, sealants, and slope correction creates a durable solution, aligning with industry standards for longevity and cost-efficiency.