How do you maintain a metal roof?
Updated August 2026
A metal roof is close to maintenance-free, but "close" means one inspection a year: retighten screws that have backed out, renew the rubber washers that dry and crack, and touch up sealant at every seam and penetration. The panels themselves last 40 to 70 years, so the weak point is the hardware, not the metal, and on exposed-fastener panels those neoprene washers need service every 10 to 15 years. Stay on it and one loosened screw never becomes a pinhole that tracks water under the panel and into the deck.
| Task | Interval | Effort |
|---|---|---|
| Check exposed screws for backing out or loose washers | Yearly | 30 min · DIY |
| Inspect sealant at seams, ridges, and penetrations | Yearly | 20 min · DIY |
| Look over flashing at chimney, valleys, and walls | Yearly | 15 min · DIY |
| Scan panels for scratches, chips, or surface rust | Yearly | 15 min · DIY |
| Task | Interval | Effort |
|---|---|---|
| Clear leaves and debris from valleys and behind chimneys | Each season | 20 min · DIY |
| Touch up scratches with matching paint before they rust | As spotted | $15–30 DIY |
| Task | Interval | Effort |
|---|---|---|
| Replace all exposed-fastener neoprene washers | 10–15 years | $300–800 pro |
| Task | Interval | Effort |
|---|---|---|
| Recoat or repaint a painted-panel roof | 15–20 years | $1–3 / sq ft |
What neglect costs
The whole risk on a metal roof rides on tiny parts. A single screw that has backed out, or a washer gone hard and cracked, leaves a pinhole, and because metal panels shed water fast, that pinhole feeds a steady stream under the panel and onto the decking every rain. Left alone it rots the deck and telegraphs a stain far from the actual hole, making it a pain to trace. Re-screwing and re-washering a whole roof runs a few hundred dollars; a deck rebuild and reroof runs into the thousands. Surface rust from an untouched scratch spreads the same way.
Leave these to a pro
Walking a metal roof is genuinely hazardous, slick underfoot and easy to dent, so the annual inspection and any washer or sealant work are worth handing to a roofer who knows standing-seam versus exposed-fastener systems. A full washer replacement at the 10 to 15-year mark runs $300 to $800, and repainting a coated roof lands around $1 to $3 per square foot. From the ground you can spot obvious loose screws, debris in valleys, and rust streaks, and flag them, but the on-roof work belongs to a pro.
This whole checklist ships as reminders in OnOtto: every task above, on the right schedule for your home, snooze-proof.
Load this checklist as remindersFrequently asked questions
Does a standing-seam roof need the same maintenance?
Less of it, because standing-seam panels hide their fasteners under the raised seams with concealed clips, so there are no exposed screws or rubber washers to back out and fail. That removes the metal roof's biggest maintenance item. You still inspect the seams, flashing, and sealant at penetrations yearly, clear debris, and touch up scratches, but you skip the 10 to 15-year washer service. Exposed-fastener panels are cheaper up front and that is the tradeoff: their screws and washers are the parts you have to keep after.
Do metal roofs rust?
Modern panels resist it well. Galvanized and Galvalume steel carry a zinc or zinc-aluminum coating plus a factory paint finish, and aluminum panels do not rust at all. Rust starts where that coating is breached: a deep scratch, a drilled edge, or a spot where two dissimilar metals touch and corrode. That is why you touch up scratches with matching paint promptly and keep debris from trapping moisture against the panels. Caught early, a scratch is a $20 fix; ignored, surface rust creeps under the coating and spreads.
Can I walk on a metal roof to inspect it?
Cautiously, and it is usually smarter not to. Metal is slippery when wet, frosty, or dusty, and stepping in the wrong place dents panels or crushes a seam. If you must, go on a dry day in soft-soled shoes, step only over the framing or in the flat pans near the eave, and use fall protection. For most owners the yearly look is better done with binoculars from the ground or a ladder at the edge, with a roofer handling anything that needs hands on the panels.
How often do the screws need replacing?
On exposed-fastener panels, plan a full washer-and-screw service every 10 to 15 years. The screws are fine; it is the neoprene washer under each head that dries, hardens, and cracks from years of sun and thermal movement, and once it does the screw hole leaks. Thermal cycling also slowly walks some screws loose, which your yearly check catches one at a time. When many washers are visibly flattened or cracked, do the whole roof at once rather than chasing individual leaks.