How often should you replace a metal roof?
Updated July 2026
A metal roof outlasts almost everything else on the house: plan on 40–70 years for a concealed-fastener standing-seam roof and 30–45 years for exposed-fastener panels. The steel itself rarely wears out first; the painted coating and the rubber gaskets on exposed screws age ahead of it. Stay on top of those (re-screw at 20–30 years, recoat as the finish chalks) and you push the roof to the top of its range instead of replacing it decades early.
What changes the interval
| Your situation | Interval | Why |
|---|---|---|
| Standing seam, concealed fasteners | 40–70 years | No exposed screws means no gaskets to dry out and leak |
| Exposed-fastener ag-panel | 30–45 years | Thousands of screw gaskets are the weak point that ages first |
| Aluminum or zinc panels | 50+ years | Non-ferrous metals will not rust, so they run to the long end |
| Coastal or salt-air exposure | Toward the low end | Salt is corrosive and shortens both coating and metal life |
| Exposed screw gaskets | Re-screw at 20–30 years | The EPDM washers harden and crack long before the panels do |
| Scratched or chalking coating | Recoat, do not replace | A fresh coat restores the finish for a fraction of a new roof |
| Bare or rusting cut edges | Touch up promptly | Rust that starts at a scratch or edge spreads under the coating |
The cost of skipping it
What skipping it costs: the metal can be fine while a dried-out screw gasket drips into the attic for years, rotting decking and staining ceilings. Re-screwing an exposed-fastener roof runs about $1–2 per square foot, and a recoat is roughly $1–3 per square foot, both a fraction of a full tear-off at $8–16 per square foot, or $12,000–30,000 installed. Catching the small stuff, ideally during roof flashing inspections, is what makes a metal roof the last one you buy.
How to do it (Replacement is a pro job; annual checks are DIY from the ground)
- Once a year, scan the roof with binoculars for rust streaks, loose or backed-out screws, and lifted seams.
- On an exposed-fastener roof, watch for screws that sit high or have cracked rubber washers underneath.
- Check the flashing at valleys, chimneys, and sidewalls, where metal roofs leak long before the panels fail.
- Look for chalking or fading of the coating; a powdery residue means the finish is due to be recoated.
- Touch up any scratch or exposed cut edge with the matching manufacturer paint before rust takes hold.
- Have a metal roofer re-screw or recoat at the 20–30 year mark rather than waiting for interior leaks.
Knowing the interval is the easy half. OnOtto reminds you at the right interval, and it won't let you snooze it into next year. Tasks persist until they're done, and completing metal roof replacements schedules the next one automatically.
Put this on autopilot, free for 30 daysFrequently asked questions
Should I recoat or replace an aging metal roof?
If the panels are sound and just the finish or fasteners have aged, recoat and re-screw, do not replace. A quality acrylic or silicone recoat at roughly $1–3 per square foot restores weatherproofing and appearance and buys another decade or two. Replacement only makes sense when panels are perforated by rust, seams have failed structurally, or the deck beneath has rotted from a long-ignored leak.
Why do exposed-fastener roofs last less than standing seam?
It comes down to the screws. An exposed-fastener roof is held on by thousands of screws with rubber (EPDM) washers driven through the panel face. Those washers harden, crack, and back out with heat cycling and UV, usually around 20–30 years, and each one becomes a potential leak. Standing-seam roofs hide their fasteners under interlocking seams, so there is no gasket exposed to weather, which is why they reach 40–70 years.
Does a metal roof really need any maintenance?
Less than asphalt, but not none. Keep it clear of leaf debris in valleys, rinse off salt near the coast, touch up scratches before they rust, and, on exposed-fastener roofs, plan on a screw replacement pass. The flashing and sealant details need periodic attention on any roof. Do that and a metal roof genuinely delivers its 40–70 year promise instead of stalling out at 25.