How long do metal roof screws last?
Short answer. The steel screw in a metal roof can last for decades, but the rubber washer that seals it usually wears out first, and on exposed-fastener roofs many owners start seeing washer and loose-screw problems somewhere around 10 to 20 years in, sooner in hot sun. Plan to inspect fasteners every year or two and replace failed screws before they cause leaks.
Why fasteners fail
- Washer aging: the EPDM or neoprene washer under the screw head hardens and cracks with UV and heat, and Georgia summers speed that up.
- Thermal movement: panels expand and contract every day. Over years the movement can work screws loose or enlarge the holes.
- Installation errors: overdriven screws crush the washer, underdriven ones never seal, and screws driven at an angle or off the framing never hold right.
- Corrosion: screws with poor coatings rust, especially in damp, shaded spots or where dissimilar metals touch.
Signs of trouble
- Rust stains streaking down from screw heads.
- Screws visibly backed out or spinning freely.
- Cracked or missing washers.
- Drips or stains inside along fastener lines or panel seams.
Fixing them
Loose screws in sound holes can be replaced with new screws of the same size. Stripped holes usually need the next size up, often sold as oversize or repair screws, so the threads bite fresh material. Screw caps or coatings can protect heads but do not fix a loose screw. Standing seam roofs avoid most of this because their fasteners are hidden under the seams.
Hail and storms
Hail can crack washers and dent panels around fasteners. Document storm damage with dated photos, close up and from a distance.
More in metal roofing in Georgia and common causes of roof leaks.