The short answer: an Interlock aluminum roof is engineered to last the life of the home — and we can show you the evidence. The Charcoal Grey Interlock shingle roof in this photo was installed in Gilsum, New Hampshire in 2004. Two decades of New England winters later, it shows zero degradation: no rust, no curling, no replacement.
Never Re-Roof Again.® with New Hampshire’s best roof
- System: Charcoal Grey Interlock aluminum shingle · 55 squares
- Installed: 2004 — Gilsum, Cheshire County, NH
- Most recent photo: taken at 18 years, 9 months — and the roof is still performing today, 21+ years in
- Condition: no rust, no curling, no fading beyond spec, no replacement
Why this one roof matters
Every roofing company says “lifetime.” Almost none can point to a specific, photographed, dated installation and let it speak. This Gilsum roof is our documented benchmark: installed while the first iPhone was still three years away, it has carried every snow load, ice-dam season, and freeze-thaw cycle Cheshire County could throw at it.
An asphalt roof installed the same year would now be on its second replacement — two more tear-offs, two more dumpsters, two more five-figure checks.
What makes it last
Aluminum cannot rust; it forms a stable, self-protecting oxide layer. The panels lock on all four sides, so wind has nothing to lift and backed-up meltwater has no exposed seam to creep under. The Alunar® finish carries a 30-year coating warranty, and the system itself is backed by the Interlock® Lifetime Limited Warranty — transferable to the next owner.
If you’re weighing “how long does a metal roof actually last?” — come see us at a home show, browse the documented projects, or plan your last roof.
