Metal Roofing in Mitchell, Wisconsin — Lifetime Interlock® Aluminum Shingles Installed Locally

Interlock's four-way interlocking aluminum panels shed snow reliably because the smooth surface and steep-profile options (Slate, Shake, Tile) discourage accumulation, while the material itself weighs only 0.41–0.59 lb/sq ft—light enough that snow load poses no structural risk. In freeze-thaw cycles like Mitchell's 84 days per year, aluminum expands and contracts uniformly without the cracking or splitting that plague asphalt and wood. Snow guards can be added if you prefer controlled melting. The warranty explicitly covers snow and ice damage, giving you confident winter protection.

No. Aluminum's molecular structure makes it inherently resistant to freeze-thaw damage—it doesn't absorb moisture, so repeated freezing and thawing cycles (about 84 per year here) cause no splitting, cracking, or delamination. The Alunar 70% PVDF fluorocarbon coating, warranted for 30 years against degradation, protects against the oxidation that salt spray from winter roads can trigger elsewhere. With roughly 3113 sunshine hours annually, Mitchell's dry intervals help the oxide layer self-heal. Asphalt and wood shingles, by contrast, absorb water and fail under the same stress.

Aluminum cannot rust—it contains no iron, so there is no oxidation process that produces rust as seen in steel or iron roofs. Mitchell receives about 726 mm of rain yearly, and that exposure actually strengthens aluminum's protective oxide layer, which self-heals when scratched. The Alunar 70% PVDF fluorocarbon finish (applied to both sides of every panel) adds a 30-year warranty against chalking and fading, even in high-moisture environments. This is why Interlock roofs have been installed in coastal salt-air homes since 1998—they're proven in conditions far harsher than inland Wisconsin.

No structural reinforcement is needed. Interlock's aluminum panels are extraordinarily light—the Mediterranean Tile profile, for example, weighs about 0.59 lb/sq ft, roughly 96% lighter than concrete or clay tile. This lightweight design means the Shake, Slate, and Tile profiles install directly over most existing roofs without added framing cost. Your home's structure already supports the weight of 105 cm of snow that Mitchell experiences annually; adding a metal roof actually reduces that load significantly compared to traditional tile or slate. This cost saving alone often offsets material investment.

Interlock metal roofing is warranted to resist wind speeds up to 120 mph when installed to specification—well beyond Mitchell's typical gusts of about 101 km/h (63 mph). The four-way interlocking aluminum panels lock together on all edges, creating a unified system that distributes wind pressure rather than allowing individual shingle lift. This design earned code compliance under ICC-ES evaluation report ESR-1790 (reissued 2025 for IBC/IRC). The combination of light weight (0.41–0.59 lb/sq ft) and mechanical interlock means wind cannot peel or separate panels like it can with nailed shingles.

Interlock aluminum panels carry the highest hail rating available—UL 2218 Class 4 impact resistance—and the Guardian warranty explicitly covers perforation from hailstones up to 1.5 inches. This rating means the material resists impact from objects dropped from 20 feet, far exceeding real-world hail exposure. After hail, the smooth aluminum surface shows minimal cosmetic marks compared to asphalt shingles, which lose granules and develop leaks. Many homeowners find that this superior impact resistance qualifies them for insurance discounts; contact your agent with the UL 2218 Class 4 certification for your policy review.

The Guardian warranty is a lifetime limited, non-prorated material warranty for the original owner—meaning there is no percentage reduction in coverage as the roof ages. It covers rusting, rotting, splitting, cracking, curling, and loss of impact resistance. The warranty transfers once to the next owner for 50 years from completion, a feature that increases resale appeal and gives you peace of mind that your investment retains value. Combined with aluminum's proven durability (Interlock has been manufactured since 1998 and installed from coastal salt-air homes to an Antarctic research station), this warranty reflects genuine confidence in the product's lifespan.

Yes. Aluminum is non-combustible, and Interlock offers Class A fire classification (the highest available) for residential and commercial roofs. Class A means the roof material itself will not ignite or spread flames—a significant advantage over asphalt shingles, which are combustible. The ICC-ES evaluation report ESR-1790 confirms compliance with IBC/IRC fire codes. If fire safety is a concern (whether from local wildfire risk or insurance requirements), specifying the Class A option provides assurance that your roof meets the most stringent fire standards without reducing aesthetics—all five Interlock profiles are available with this rating.

Yes. Although aluminum roofing costs more initially than asphalt shingles, it is the last roof you buy. Asphalt typically lasts 15–20 years; Interlock's non-prorated lifetime limited warranty and 95% recyclability mean you will not replace it, re-roof your home multiple times, or pay for tear-off and landfill disposal of deteriorated shingles. Over 40 years, the total cost of ownership—including labor for multiple asphalt replacements—favors aluminum. Additionally, the warranty transfers to the next owner for 50 years, protecting your home's resale value. Energy-efficient colors (energy-efficient, up to 0.55 solar reflectance) also reduce cooling costs in sunny months, adding to the long-term return.

Installation timeline varies by roof size and complexity but is faster than asphalt replacement because there is no tear-off required if the existing roof is structurally sound. The lightweight aluminum panels (Slate at 0.41 lb/sq ft, for example) install directly over most existing roofing without structural reinforcement, reducing labor and material cost. Our local installer, serving the region since 2001, will inspect your roof during an estimate to confirm whether over-roof installation is viable. The interlocking panel design speeds installation because each panel locks mechanically to its neighbors—no individual fastening of hundreds of shingles. You will avoid the disruption, dust, and disposal expense of complete tear-off.

Yes. Mitchell averages about 105 cm of snow, 726 mm of rain, roughly 84 freeze–thaw days a year, with peak wind gusts near 101 km/h. Interlock® aluminum roofing is wind-rated to 193+ km/h (120 mph), UL 2218 Class 4 impact-rated and Class A fire-rated, and its four-way interlocking panels shed snow and resist ice dams and freeze–thaw cracking — all backed by a lifetime limited, transferable warranty.