Metal Roofing in St. Francis, Wisconsin — Lifetime Interlock® Aluminum Shingles Installed Locally

Aluminum's smooth, hard surface sheds snow and ice more effectively than asphalt, reducing the weight load and ice-dam risk during St. Francis's 88 cm annual snowfall and 79 freeze-thaw cycles per year. The four-way interlocking panels are warranted for wind gusts up to 120 mph, so they hold fast as snow slides. You can add snow guards to any profile if you want controlled shedding. Unlike wood shakes or asphalt, aluminum won't split, crack, or curl from the repeated freeze-thaw stress that damages traditional materials in Milwaukee County's climate.

Aluminum cannot rust because it contains no iron—the element that oxidizes and corrodes. Instead, a thin oxide layer forms on the aluminum surface; when scratched, it self-heals. St. Francis receives 822 mm of rain annually, and the Alunar 70% PVDF fluorocarbon coating—applied to both sides of every panel and warranted 30 years against chalking and fading—provides a second protective barrier. Steel roofs require constant maintenance to prevent rust; aluminum simply does not have that vulnerability, making it ideal for Milwaukee County's wet climate.

No. Aluminum expands and contracts uniformly with temperature swings, and its oxide layer actually strengthens in response to environmental stress rather than breaking down. St. Francis experiences about 79 freeze-thaw days per year—a real test—but aluminum's homogeneous structure means it won't split like wood shakes, crack like concrete tile, or become brittle. The roofing-grade 3105-H24 and 3003-H24 aluminum alloy (ASTM B209) used in every Interlock panel has been installed from coastal salt-air homes to an Antarctic research station, proving durability across extreme thermal cycling.

You typically won't need structural reinforcement because aluminum panels weigh dramatically less than slate or tile. The Interlock Mediterranean Tile profile installs at just 0.59 lb/sq ft—about 96% lighter than concrete or clay tile—so it goes right over most existing roofs without engineer consultation. St. Francis receives 88 cm of snow annually; lighter roofing means your home sheds that load more easily and safely. Interlock's four profiles range from 0.41 to 0.59 lb/sq ft, while a slate or concrete tile roof would demand costly structural upgrades before installation.

The four-way interlocking design creates a unified system that resists wind speeds up to 120 mph when installed to specification—well above St. Francis's typical gust speeds of 96 km/h. The panels lock on all four sides, so wind cannot separate or lift them. That mechanical interlocking (evaluated under ICC-ES ESR-1790 for IBC/IRC compliance) distributes lateral force across the entire roof, not just fasteners. Combined with the warranty backing, metal roofing eliminates the shingle-blow-off vulnerability that asphalt faces during Milwaukee County's spring and fall storms.

Yes. Interlock's aluminum panels carry a UL 2218 Class 4 impact rating—the highest available—and the warranty covers perforation from hailstones up to 1.5 inches. That proven impact resistance often qualifies homeowners for insurance discounts; ask your carrier for a quote before and after installation. St. Francis averages 3,128 sunshine hours yearly but is not hail-immune; Class 4 rating means the panel absorbs impact without cracking or puncturing the way asphalt or wood shakes do. Many insurers recognize this durability and reward it.

energy-efficient Interlock colors achieve thermal emissivity of 0.84 and solar reflectance up to 0.55 (Aged Copper Penny), meaning they reflect heat rather than absorbing it the way asphalt does. St. Francis receives 3,128 annual sunshine hours, so reflectivity compounds savings over the year. Cool Roof Rating Council testing confirms these values. Lighter colors reduce cooling load in summer; the reflective coating is durable 30 years (ASTM D4214/D2244). Over a typical roof lifespan, reflectivity translates to measurable utility savings—no claim, but a tested characteristic backed by independent certification.

Aluminum is non-combustible, and Interlock metal roofing qualifies for Class A fire classification under ICC-ES evaluation report ESR-1790 (reissued 2025 for IBC/IRC). It will not ignite, spread flame, or contribute fuel to a fire—a critical advantage over wood shakes or asphalt. Class A rating also satisfies CALGreen verification for reduced maintenance risk. St. Francis building codes align with Wisconsin's adoption of the International Residential Code, and metal roofing exceeds those standards. If fire safety and insurance rating are priorities, aluminum's non-combustibility is a permanent, material advantage.

The 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. It's one-time transferable to the next owner for 50 years from completion, adding value at resale. Unlike prorated warranties that shrink over time, this one doesn't. You're protected against the material failures that shorten asphalt, wood, and tile roofs. St. Francis's 88 cm annual snow and 79 freeze-thaw cycles test a roof's resilience; the Guardian Warranty reflects Interlock's confidence that aluminum won't develop those degradation problems.

Most homes install in 1–3 days depending on roof size and complexity; metal roofing crews work faster than shingle or tile crews because panels cover more area per fastener. Yes, Interlock installs directly over most existing asphalt or wood roofs—no tear-off needed—which saves labor and eliminates landfill waste. The lightweight design (0.41–0.59 lb/sq ft) means no structural prep for St. Francis homes. Your local Interlock Metal Roofing installer, serving this region since 2001, will assess your existing roof during a free inspection and confirm whether underlayment or flashing upgrades are needed. This speeds the timeline and reduces disruption.