How Long Does a Metal Roof Last?
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Quick answer
A quality metal roof lasts 40 to 70+ years, and often a lifetime — far longer than asphalt shingles at 15 to 30 years. Aluminum in particular resists the corrosion that ends most roofs, which is why Interlock's aluminum systems carry a 50-year transferable warranty and are engineered to be the last roof a home needs.
How long each roofing material lasts
Not all roofs age the same way. Metal dramatically outlasts asphalt, and among metals, aluminum and copper lead because they do not rust.
| Roofing material | Typical lifespan |
|---|---|
| Asphalt shingles | 15–30 years |
| Steel roofing | 30–60 years |
| Aluminum roofing | 50+ years (lifetime) |
| Copper | 100+ years |
Why metal — and especially aluminum — lasts so long
Asphalt fails because its organic materials break down: granules shed, the mat dries and cracks, and water gets in. Metal has none of that. It will not rot, absorb water, or feed a fire, and an interlocking design resists the wind that lifts other roofs. Aluminum goes a step further than steel: with no iron to rust and a self-healing oxide layer, it is not fighting a slow corrosion battle that a coating eventually loses. That is the difference between a 30-year roof and a lifetime roof.
What affects a metal roof's lifespan
Four things: the metal (aluminum and copper outlast coated steel), the finish (a quality PVDF coating like Alunar holds color and resists UV for decades), installation quality (correct fastening, flashing, and slope), and attic ventilation (which manages the heat and moisture that age any roof from beneath). Get those right — with installation to the applicable specifications — and the roof reaches its full lifetime potential, backed by the 50-year transferable Guardian warranty.
Frequently Asked Questions
How long does an aluminum roof last?
A quality aluminum roof lasts 50+ years and is engineered to be a lifetime roof. Because aluminum cannot rust, it avoids the corrosion that limits steel, and Interlock backs it with a 50-year transferable warranty.
Do metal roofs really last 50 years?
Yes — quality metal roofs routinely last 40–70+ years, and aluminum and copper often exceed that. It is two to three times the lifespan of asphalt shingles, which is why metal is considered a lifetime roof.
What makes a metal roof fail early?
Almost always corrosion (on coated steel), poor installation, or an inadequate coating — not the metal itself. Aluminum sidesteps the corrosion issue entirely, and proper installation plus ventilation handles the rest.
Is a metal roof a lifetime roof?
For most homeowners, yes. A well-installed aluminum roof is designed to outlast the time you own the home — the basis of Interlock's "never re-roof again" positioning and 50-year transferable warranty.
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Sources
- Angi — Metal Roof Lifespan by Material — Lifespan by metal
- HomeGuide — Metal Roof Cost (2026) — Lifespan vs asphalt
Explore Interlock Metal Roofing
Last reviewed 2026-07-11 · Reviewed by Scott Plumptree, Director of Marketing, The Interlock Group · Reviewer profile