Exposed fastener leaks in metal roofing occur when the screws or nails fastening the metal panels become loose, rusted, or their sealing washers deteriorate over time. Since these fasteners penetrate the metal, they can allow water to seep through if the seal is compromised. Chimney flashing leaks happen when the metal or rubber flashing installed around the chimney fails, often due to age, improper installation, or damage from weather and debris. Both issues are common in areas exposed to heavy rain, ice, or extreme temperature fluctuations, which can cause metal to expand and contract, loosening fasteners or damaging flashings. To diagnose these leaks at home, carefully inspect the attic or interior ceilings for water stains above or near the metal roof or chimney. From the outside, look for rusted fasteners, missing washer seals, cracked or lifted flashing, and gaps where the flashing meets the chimney or metal panels. You might also notice discoloration, mold, or peeling paint around those areas, indicating water intrusion.
For safe DIY checks, you can tighten any visibly loose fasteners with a screwdriver, but be careful not to over-tighten and crush the sealing washer. Also, gently clear debris from flashing joints to see if they’re sealed or show cracks. Applying a high-quality, roofing-grade sealant can temporarily reduce leaks, but this is often a short-term fix. If you find significant rust, damaged flashing, or persistent water entry, it’s time to call a professional roofer. When speaking with a contractor, ask if they inspect and replace fasteners using neoprene washers approved for your roof type and whether they’ll use new flashing materials compatible with your chimney and roofing system. Additionally, inquire about how their work will affect your roofing warranty, ensuring that any repairs will maintain coverage without causing voids. This helps ensure you get a long-lasting, code-compliant fix rather than a quick patch.