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

Yes—aluminum actually improves with freeze-thaw cycling because it has no moisture-absorbing substrate. DeForest experiences about 84 freeze-thaw days per year, which breaks down asphalt and wood but leaves aluminum unharmed. The material's oxide layer self-heals when scratched, so micro-cracks from thermal stress never propagate into leaks. Unlike slate or concrete tile, which can spall and crack after repeated freezing, aluminum expands and contracts uniformly without structural fatigue. The four-way interlocking panels stay sealed across thousands of seasonal swings.

The smooth interlocking surface sheds snow far more efficiently than asphalt or wood shake. DeForest averages about 89 cm of snow annually, and metal's slickness prevents the ice-dam formation that plagues traditional roofs. Because the aluminum panels are nearly 96% lighter than concrete or clay tile, you don't need structural reinforcement—the roof sits safely over your existing structure even after snow loads. Optional snow guards can be installed where desired. The non-absorptive surface means melting snow doesn't seep into substrate or create hidden moisture pockets that invite rot.

DeForest's typical peak gusts reach about 104 km/h, and Interlock panels are warranted to resist winds up to 120 mph (193 km/h)—significantly exceeding local extremes. The four-way interlocking system creates a unified surface that distributes pressure across the whole roof rather than relying on fasteners alone. Each panel locks to its neighbors on all four sides, so wind pressure is transferred laterally instead of pulling at nail holes. This is why the system works from coastal salt-air homes to Antarctic research stations—it doesn't just withstand gusts; it transforms them into structural advantage.

Aluminum cannot rust because it contains no iron—the element that oxidizes into rust. Instead, aluminum develops a thin, self-sealing oxide layer that actually protects the metal underneath. If that layer is scratched, it heals automatically within hours. Interlock panels use roofing-grade 3105-H24 and 3003-H24 aluminum alloy (ASTM B209) with a Alunar 70% PVDF fluorocarbon coating on both sides, warranted for 30 years against chalking. DeForest's 781 mm of annual rainfall and seasonal moisture pose zero risk of rust—the coating and the aluminum itself work together to ensure decades of corrosion-free performance.

The Guardian lifetime limited warranty on Interlock—non-prorated for the original owner, transferable for 50 years—eliminates the cycle of tear-off and replacement that asphalt demands every 15–20 years. Over 50 years, a typical home replaces asphalt shingles 2–3 times, each tear-off dumping thousands of pounds into landfill. Interlock's weight (the Cedar Shingle at 0.41 lb/sq ft) means no structural work, so you avoid that hidden cost. Energy-efficient profiles like Aged Copper Penny reflect up to 0.55 of solar energy, lowering cooling costs in warmer months. The one-time purchase transforms your roof from a recurring expense into a permanent asset.

The Guardian is a lifetime limited, non-prorated material warranty for the original owner—meaning you pay the same claim value whether you file in year one or year 40. It covers rusting, rotting, splitting, cracking, curling, and loss of impact resistance. The warranty is one-time transferable, giving the next owner 50 years of coverage from completion, a benefit that substantially increases resale appeal. Interlock has been manufactured since 1998 in Delta, BC and installed across climates from salt-air coasts to Antarctic research facilities, proving that the aluminum and Alunar coating endure decades of real-world stress. With about 84 freeze-thaw cycles annually in DeForest, that durability translates directly to peace of mind.

Interlock panels carry a UL 2218 Class 4 impact rating—the highest available—and the Guardian Warranty even covers perforation from hailstones up to 1.5 inches. Class 4 resistance is rare and signals durability that insurers recognize. Many homeowners qualify for insurance premium discounts because the non-combustible aluminum and extreme impact rating reduce claim likelihood. The four-way interlocking design distributes impact energy across the entire panel system rather than concentrating it at fasteners, so the roof absorbs punishment that would fracture slate or create soft spots in asphalt. If a severe hail event occurs, you have both warranty protection and the confidence that your roof remains structurally sound.

Far less than traditional materials. Asphalt shingles require moss/algae treatment, seasonal gutter cleaning from granule shedding, and ventilation checks. Wood shakes split and invite rot; slate and concrete tile crack and need pointing. Interlock's non-porous aluminum surface doesn't absorb moisture, so it resists moss, algae, and rot. DeForest's 3089 annual sunshine hours keep the surface dry between rains, and the smooth panels shed debris naturally. The 30-year Alunar coating (ASTM D4214 / D2244) resists weathering without repainting. The main task is occasional gutter cleaning—which you'd do anyway. That's why Interlock is CALGreen-verified for reduced maintenance: the material itself eliminates the problems that demand upkeep.

Yes. Interlock aluminum is non-combustible and qualifies for Class A fire classification—the highest fire-safety rating available. Aluminum will not burn, cannot sustain flame, and produces zero flammable gases when exposed to extreme heat. This matters particularly if your home is near wooded areas or if your homeowners insurance carries wildfire-zone provisions. The ICC-ES evaluation report ESR-1790 (current 2025 edition) documents Interlock's compliance with IBC and IRC fire codes. Many insurance carriers offer premium reductions for Class A roofs because the non-combustible material stops fire spread at the roof line. In Wisconsin's climate, the metal panels also eliminate the degradation that wood-based roofs suffer, so fire performance remains stable for the roof's entire lifespan.

Interlock installs directly over your existing asphalt roof in most cases, eliminating the cost and waste of tear-off. The panels' extraordinary lightness—the Mediterranean Tile profile at 0.59 lb/sq ft, about 96% lighter than concrete or clay tile—means no structural reinforcement is required. Your home's framing already supports the old shingles, so it easily handles the aluminum addition. Installation typically takes 1–2 days per average residential roof because the four-way interlocking system works faster than traditional fastener-based methods. The local installer, Interlock Metal Roofing, has served this region since 2001 and understands DeForest's specific building codes and existing roof conditions. You'll have a new roof without the disruption, cost, and environmental burden of hauling thousands of pounds of asphalt to the landfill.

Yes. DeForest averages about 89 cm of snow, 781 mm of rain, roughly 84 freeze–thaw days a year, with peak wind gusts near 104 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.