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

Interlock's four-way interlocking aluminum panels shed snow and ice efficiently because the smooth surface and panel overlap create fewer spots where ice can dam. Norway averages about 88 cm of snow yearly, and freeze-thaw cycling occurs roughly 79 days per year—conditions that crack and curl asphalt shingles but don't affect aluminum's oxide layer. The panels' light weight (Slate at 0.41 lb/sq ft) means no snow load reinforcement is needed. Snow guards are available if you want to control roof runoff during thaws.

No. Freeze-thaw damage occurs because moisture enters porous materials and expands when it freezes, but aluminum is non-porous and its self-healing oxide layer remains intact even when scratched. Norway's 79 freeze-thaw days per year will degrade asphalt, wood shake, and concrete tile—all absorb water—but roofing-grade 3105-H24 aluminum alloy simply cannot rot, crack, or curl from thermal cycling. The Alunar 70% PVDF coating, warranted 30 years against chalking, protects against the region's 822 mm annual rainfall without degradation.

Steel roofing rusts because iron oxidizes into iron oxide (rust), which flakes away and exposes more metal to corrosion. Interlock panels are pure roofing-grade aluminum—no iron content—so rust is chemically impossible. Aluminum forms a thin, self-healing oxide layer that blocks further oxidation and regenerates if scratched. Even in coastal salt-air environments, Interlock has been installed since 1998. For a Wisconsin homeowner, this means your roof will never need rust treatment, and the Alunar 70% PVDF fluorocarbon finish on both panel sides provides an extra barrier during Norway's wet winters (about 82 cm of rain and snow combined annually).

Yes. Interlock's four-way interlocking design and the Guardian warranty guarantee wind resistance up to 120 mph, while Norway's typical wind gusts reach about 96 km/h (60 mph)—well within the rated capacity. The panels interlock on all four edges, distributing wind load across the roof structure rather than relying on fasteners alone. This design also passes ICC-ES evaluation ESR-1790 for compliance with IBC and IRC wind codes. Even during severe weather events that would lift or peel asphalt shingles, Interlock panels remain secured.

Interlock achieves UL 2218 Class 4 impact rating—the highest available—and the warranty covers even perforation from 1.5-inch hailstones. This exceptional durability often qualifies homeowners for insurance premium reductions; contact your agent with the UL 2218 Class 4 rating and the 30-year coating warranty details. Unlike asphalt shingles (which dent and degrade from hail), or wood shake (which splits), aluminum panels absorb impact without permanent loss of protective value. Over a 50-year ownership span in Wisconsin's climate, this translates to one roof instead of three or four asphalt replacements.

Over the roof's lifetime, yes. Asphalt shingles last 15–20 years in Wisconsin's 79 freeze-thaw days and 88 cm annual snow; you'll replace them three or four times. Interlock carries a lifetime limited material warranty (non-prorated for the original owner) and transfers 50 years to the next owner, meaning you buy one roof and keep it. No tear-off labor, no landfill fees, no re-roofing disruption. Add the potential insurance discount for UL 2218 Class 4 impact resistance and the energy-efficiency cooling benefit in summer, and the total cost per year of ownership favors aluminum across a 50+ year horizon.

energy-efficient Interlock colors have thermal emissivity of 0.84 and solar reflectance up to 0.55 (Aged Copper Penny), rated by the Cool Roof Rating Council. These values mean the roof reflects heat that dark asphalt absorbs, reducing attic temperature and air-conditioning demand during warm spells. Norway receives about 3,128 sunshine hours yearly, so even in a cold climate, summer cooling matters. The reflective coating costs nothing extra and is built into the Alunar 70% PVDF finish warranted for 30 years—no maintenance required to preserve its benefit.

Interlock's aluminum is extraordinarily light. The Slate profile installs at 0.41 lb/sq ft, and the Mediterranean Tile—which replicates heavy clay—weighs only 0.59 lb/sq ft, about 96% lighter than real tile. Most houses built to support asphalt shingles (about 2–3 lb/sq ft) can accept Interlock without reinforcement. The ICC-ES ESR-1790 evaluation confirms the panels meet IBC/IRC code for residential roof loading across most of North America. Installation can occur directly over your existing roof in many cases, avoiding costly decking replacement and landfill tear-off costs.

Virtually none. Asphalt shingles require moss/algae treatment, missing-shingle replacement, and gutter clearing after deterioration. Wood shake splits and curlsCCALGreen verification confirms Interlock metal roofing qualifies for reduced maintenance standards. The non-porous aluminum surface sheds debris naturally; gutters stay cleaner because no shingle granules wash down. Rainfall (about 82 cm yearly) and snowmelt rinse the roof naturally. The Alunar 70% PVDF coating is factory-applied to both sides and warranted 30 years; no field re-coating or sealant reapplication is ever needed. Inspect fasteners every 5–10 years; that's routine for any roof.

Interlock Metal Roofing has served the region since 2001 and is the local licensed installer for Norway and Racine County. The company handles site assessment, material selection (five profiles: Slate, Cedar Shingle, Shake, Standing Seam, Mediterranean Tile), installation, and warranty administration. A local installer means faster response, familiarity with Wisconsin's 79 freeze-thaw days and 88 cm average snow, and accountability within the community. Contact the installer for a free roof evaluation and to confirm whether your existing structure suits an over-install, which saves time and disposal costs.