Metal Roofing in Hanover, Minnesota — Lifetime Interlock® Aluminum Shingles Installed Locally

Interlock's four-way interlocking aluminum panels shed snow reliably because the smooth, sloped surface doesn't trap moisture the way asphalt does. With Hanover averaging about 95 cm of snow annually and roughly 79 freeze-thaw days per year, your roof cycles between wet and frozen conditions constantly—exactly where asphalt shingles curl and crack. Aluminum's oxide layer stays flexible through those swings; it won't split or crack as temps swing above and below freezing. Snow guards can be added if you want to control slide-off, but the material itself handles the load without structural reinforcement.

Freeze-thaw damage happens when water seeps into a material, freezes, expands, and cracks it from inside—a cycle that repeats about 79 times yearly in Hanover. Asphalt and wood-based materials absorb moisture and deteriorate this way. Aluminum roofing-grade 3105-H24 alloy doesn't absorb water, so there's nothing to freeze and expand inside the panel. The four-way interlocking design keeps water moving off the roof rather than pooling. Over 25 years, that immunity to internal freeze damage adds up to a roof that stays intact while asphalt shingles are curling and splitting.

No—aluminum cannot rust because it contains no iron, and iron is what rusts. Instead, aluminum naturally forms a transparent oxide layer that protects the metal underneath; when that layer is scratched, it self-heals automatically. Interlock uses roofing-grade 3105-H24 and 3003-H24 aluminum alloy (ASTM B209), which has handled everything from coastal salt-air homes to Antarctica research stations. The Alunar 70% PVDF fluorocarbon finish on both sides provides an extra 30-year warranty against chalking and fading. In Hanover's 796 mm annual rainfall, that dual protection means your roof won't corrode or delaminate the way painted steel will after decades of moisture exposure.

Possibly—many insurers do offer discounts for Class 4 impact-rated roofing, and Interlock carries UL 2218 Class 4 certification, the highest impact rating available. The warranty even covers perforation from hailstones up to 1.5 inches. You'll want to contact your agent with the UL 2218 Class 4 documentation to ask whether your policy qualifies for a break on premiums. Minnesota's hail season and Hanover's average wind gusts of 19 km/h (with peaks to 94 km/h) make impact resistance real insurance, not just a selling point. Getting a discount on your premium while gaining durability is worth a quick phone call.

No structural reinforcement is needed. Interlock's Mediterranean Tile profile weighs only about 0.59 pounds per square foot—roughly 96% lighter than concrete or clay tile—so it installs directly over most existing roof decks and framing without upgrades. Compare that to traditional tile, which can weigh 10–15 pounds per square foot and often requires roof reinforcement. For Hanover homeowners, this means you can install Interlock Tile over your existing asphalt roof, avoiding a costly tear-off and structural engineering. The light weight also means easier installation and lower labor costs, all while you get the authentic tile aesthetic.

energy-efficient color options for Interlock include profiles with thermal emissivity up to 0.84 and solar reflectance up to 0.55 (Aged Copper Penny), rated by the Cool Roof Rating Council. In a climate where Hanover receives about 3,128 sunshine hours yearly, that reflectance matters—aluminum bounces heat back into the atmosphere rather than absorbing it like dark asphalt does. Lower roof surface temperature means your air conditioner works less hard on summer days and your attic stays cooler. Over a roof's 50+ year lifespan, the energy savings compound, especially in homes with good insulation that can actually benefit from reduced heat gain.

Interlock panels interlock four ways—top, bottom, and both sides—creating a unified system that resists wind uplift rather than fighting it individually. The warranty covers wind speeds up to 120 mph (193 km/h) when installed to spec. Hanover's average winds of 19 km/h with gusts reaching 94 km/h fall well within that range, so the roof won't lift, separate, or rattle. That four-way connection also means water can't work its way underneath during the kind of horizontal rain that comes with strong wind, which is valuable in a climate that gets 796 mm of annual rainfall. The result is a watertight, wind-secure roof that doesn't need re-fastening every few years.

Interlock's Guardian Warranty is a lifetime limited, non-prorated material warranty for the original owner—covering rusting, rotting, splitting, cracking, curling, and loss of impact resistance with no annual cost cap. It's transferable once, giving the next owner 50 years of coverage from completion, which means resale value is protected. The Alunar coating itself carries a separate 30-year warranty against chalking and fading (verified by ASTM testing). In Hanover's freeze-thaw environment and with 79 annual freeze-thaw cycles, that non-prorated lifetime coverage shields you from the degradation that asphalt shingles suffer. Most owners see the roof outlast their mortgage.

Interlock requires virtually no maintenance—no re-nailing, no sealing, no moss treatment, no seasonal upkeep. Asphalt shingles need inspection and touch-up every few years, especially in Hanover's 79 annual freeze-thaw cycles where they cup and crack. Wood shakes rot and split; concrete or clay tiles break and leak. Aluminum panels don't absorb water, so they don't support mold or algae growth. Rain (796 mm yearly) naturally washes the surface. The ICC-ES ESR-1790 code evaluation and CALGreen verification confirm reduced maintenance burden. Over 50 years, that means no gutter repairs from debris, no seasonal inspections, just a roof that sheds water and keeps doing its job quietly.

Yes—Interlock aluminum panels are non-combustible and Class A fire-rated is available, the highest fire classification. Aluminum cannot ignite or contribute fuel to a fire, unlike wood shakes or asphalt. Your homeowner's insurance may recognize this non-combustibility with a premium reduction, similar to hail discounts. The ICC-ES ESR-1790 evaluation report (reissued 2025) confirms Interlock's compliance with IBC and IRC fire codes. In a state with roughly 3,128 sunshine hours per year and wildfire risk increasing across the region, choosing a non-combustible roof protects your home, reduces insurer risk, and may lower your premiums. It's peace of mind that also shows up in your policy.