Metal Roofing in Stillwater, Minnesota

Aluminum panels shed snow and ice far more efficiently than asphalt because the metal's smooth surface and thermal properties prevent the adhesion that traps moisture. Stillwater averages about 94 cm of snow annually and roughly 81 freeze-thaw days per year—the exact conditions where ice dams destroy asphalt roofs. Interlock's four-way interlocking system handles snow loads without deformation, and the lightweight design (Slate at 0.41 lb/sq ft) means no structural upgrades needed. Snow guards are available if you want to manage runoff deliberately rather than letting it slide unpredictably.

No—aluminum's oxide layer actually strengthens under repeated freeze-thaw stress and cannot crack the way asphalt, wood, or concrete tile can. The material contains no iron, so rust cannot initiate and spread through freeze cycles, which is the hidden killer in steel roofing. With about 81 freeze-thaw days per year in Stillwater and annual snowfall near 94 cm, your roof experiences that cycle hard. Interlock's 3105-H24 aluminum alloy (ASTM B209) is engineered for exactly these conditions; it's been installed from coastal salt-air homes to an Antarctic research station. The Guardian warranty covers cracking and splitting—neither happens with aluminum.

Yes, and your insurance company may notice. The four-way interlocking aluminum panels are warranted to resist wind speeds up to 120 mph (193 km/h) when installed to specification. Stillwater's typical wind gusts reach about 95 km/h, so you're well within the safety margin even on severe weather days. Unlike shingle roofs that lift and separate at the edges, Interlock's panels lock together on all four sides—wind cannot get underneath. This UL 2218 Class 4 impact rating (the highest available) and wind warranty sometimes qualify homeowners for insurance premium reductions; check with your carrier.

Steel rusts the moment its protective coating scratches or fades because iron oxidizes and the corrosion spreads beneath the surface. Aluminum cannot rust—it contains no iron. Instead, aluminum forms a self-healing oxide layer that seals itself when scratched, protecting the metal underneath permanently. In a climate with 843 mm of rain and 94 cm of snow per year, that difference compounds. Your roof gets knocked by branches, hail, and foot traffic; asphalt splits, wood rots, and steel begins to rust silently under the coating. Interlock's roofing-grade aluminum (3105-H24 and 3003-H24 per ASTM B209) with its 30-year Alunar® PVDF coating applied to both sides gives you decades of protection without the hidden decay.

Interlock panels are rated UL 2218 Class 4, the highest impact classification available, and the Guardian warranty covers perforation from hailstones up to 1.5 inches—larger than most Minnesota hail events. Class 4 ratings often qualify you for homeowner insurance discounts because the roof resists the damage that triggers claims. After you have the roof installed, contact your insurance agent and provide the UL 2218 Class 4 certification; many carriers will reduce your premium. Unlike asphalt shingles that dent, curl, and lose granules in hail, aluminum panels take the impact and stay intact. Over a 30+ year lifespan, that's money back in your pocket.

The opposite problem: it's so light that your house structure won't need reinforcement. The Slate profile installs at just 0.41 lb/sq ft and the Mediterranean Tile at about 0.59 lb/sq ft—roughly 96% lighter than actual concrete or clay tile. Your home's framing was built for conventional roofing, so a metal roof sits comfortably within the design load. This lightweight advantage matters in Stillwater's heavy snow climate (about 94 cm annually); the roof won't add dead load that compounds snow load on your frame. Because the panels are light, installation is faster, labor costs drop, and you can often install directly over your existing roof without tear-off, saving disposal costs and weeks of disruption.

energy-efficient Interlock colors reflect heat instead of absorbing it the way asphalt does. The reflectance reaches up to 0.55 (Aged Copper Penny profile) with thermal emissivity of 0.84, meaning the roof bounces solar energy back and reduces air conditioning load. In Stillwater's about 3,110 annual sunshine hours, that reflection compounds. Minnesota summers are mild, so the real payoff is avoiding the indoor heat that builds under dark asphalt—cooler attic = cooler living space = lower cooling costs. Metal roofs are Cool Roof Rating Council rated and recognized by energy codes. Over 30+ years, the energy savings and the fact you'll never reroof means money stays in your account instead of going to roofing contractors.

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 also transferable once: the next owner gets 50 years of coverage from completion. That means a home buyer sees genuine value because the roof protection travels with the property. Interlock has been manufactured since 1998 in Delta, BC, and installed globally from coastal salt-air environments to Antarctica—proven longevity in extreme conditions. The Alunar® coating itself is warranted 30 years against chalking and fading (ASTM D4214 measured). In practice, a properly installed Interlock roof outlasts the mortgage and leaves your home with a roof that works for the next owner too.

Metal roofs need minimal maintenance: occasional gutter cleaning and a rinse to remove dust. Asphalt shingles require inspection for missing granules, curling, and cracking every few years and replacement of damaged sections—costs accumulate. Real slate and tile need mortar repointing, cracked piece replacement, and periodic expensive repairs. Interlock aluminum panels have no granules to lose, no mortar to fail, no wood to split or rot. Stillwater's 843 mm annual rain and about 3,110 sunshine hours will rinse and naturally weather the coating; you don't need to hire cleaners or apply treatments. The CALGreen-verified product is recognized for reduced maintenance requirements. Over 30 years, that's dozens of service calls you'll never make and the associated costs you'll never pay.

Installation typically takes days to a week depending on roof complexity; exact timeline depends on roof size and weather. Because Interlock panels weigh roughly 96% less than slate or tile, installation is faster than traditional heavy materials and doesn't require structural reinforcement. One major advantage: you can install directly over most existing asphalt roofs, eliminating the tear-off, disposal, and weeks of disruption. The lightweight design and four-way interlocking system speed the work. Interlock Metal Roofing has served the region since 2001 and manages the process end-to-end, from site assessment to flashing details to final inspection. The ICC-ES evaluation report (ESR-1790, reissued 2025) confirms code compliance across IBC/IRC standards, so permitting moves smoothly.