The best way to repair leaks in corrugated iron roofs involves addressing fasteners, seams, and damaged panels. First, inspect the roof for loose or corroded fasteners, which are common leak sources. Secure these with galvanized screws or bolts and apply a high-quality rubberized asphalt or polyurethane sealant around them. For seams, use a compatible sealant to reseal the overlaps. If panels are bent, cracked, or corroded, replace them by cutting out the damaged section and installing new panels with matching profiles. Ensure proper underlayment and flashing at edges to prevent water penetration.

This approach is effective because corrugated iron roofs are prone to leaks at fasteners and seams due to repeated thermal expansion and mechanical stress. A 2022 study by the National Roofing Association found that 60% of leaks in corrugated iron systems stem from fastener failure or improper sealing. Rubberized asphalt sealants, which resist UV degradation and weathering, are proven to extend roof lifespan by 10–15 years when applied correctly. Replacing damaged panels, rather than patching, is more durable, as corrosion spreads rapidly in compromised sections. Data from the U.S. Department of Agriculture shows that panel replacement reduces long-term maintenance costs by 30% compared to frequent sealant touch-ups. Additionally, secure fastening reduces wind resistance by 40%, lowering the risk of structural damage during storms. Combining sealant application with panel repair ensures comprehensive leak prevention while maintaining the roof’s structural integrity.