Question 1

How does a metal roof handle the heavy snow St. Croix Falls gets each winter?

Accepted Answer

Interlock metal roofing sheds snow and ice effectively because its smooth, hard surface prevents moisture from bonding the way asphalt does, and the four-way interlocking panels lock panels together so snow load distributes evenly across the roof structure. St. Croix Falls averages about 97 cm of snow per year with roughly 80 freeze-thaw cycles annually, which makes material durability critical; aluminum's oxide layer self-heals from thermal stress and won't crack or curl like asphalt shingles do. Snow guards can be installed if you prefer slower shedding. The lightweight profile—Shingle at just 0.41 lb/sq ft—means your existing structure supports the snow load with no reinforcement needed, unlike slate or clay tile.

Question 2

Will freeze-thaw cycles in Minnesota damage an aluminum metal roof?

Accepted Answer

No; aluminum's molecular structure is naturally resistant to freeze-thaw damage because it expands and contracts uniformly without cracking, splitting, or absorbing water the way wood, asphalt, and concrete do. St. Croix Falls experiences about 80 freeze-thaw days per year and nearly 800 mm of annual rainfall, conditions that would accelerate deterioration in traditional roofing materials. The Alunar 70% PVDF fluorocarbon finish is warranted 30 years against chalking and fading even under these cycling stresses. Aluminum contains no iron, so rust is physically impossible—only the protective oxide layer oxidizes, and it self-heals when scratched, adding decades of durability beyond what asphalt or steel can offer.

Question 3

Can aluminum roofing rust or corrode in Minnesota's wet climate?

Accepted Answer

Aluminum cannot rust because it contains no iron; corrosion is chemically impossible. What happens instead is a microscopic oxide layer forms on the surface—this is natural, invisible, and actually protective. If scratched or abraded, the oxide layer self-heals automatically when exposed to air. With St. Croix Falls receiving about 797 mm of rain annually and typical gusts reaching 103 km/h, moisture and wind are constant, but the Alunar 70% PVDF fluorocarbon finish applied to both sides of every panel (front and back) adds an extra 30-year warranted barrier against any coating degradation. Steel roofing, by contrast, requires constant maintenance because iron oxidizes into rust. Aluminum remains maintenance-free in wet climates.

Question 4

Are Interlock metal panels strong enough for Minnesota wind and storm gusts?

Accepted Answer

Yes; Interlock panels are warranted to resist sustained wind speeds up to 120 mph (193 km/h) when installed to specification, and the four-way mechanical interlock means each panel is anchored to its neighbors so wind pressure distributes across the entire roof rather than stressing individual fasteners. St. Croix Falls averages daily-max winds around 19 km/h but experiences gusts approaching 103 km/h, so the 120 mph warranty provides substantial safety margin. This design also means no wind-driven rain penetrates between panels the way it can with traditional shingles. The ICC-ES evaluation report ESR-1790 (reissued 2025 for current building codes) confirms installation methods for your region, and many homeowners see insurance discounts because the panel design itself resists uplift better than asphalt.

Question 5

Does metal roofing hold up better in hail than asphalt shingles?

Accepted Answer

Interlock achieves UL 2218 Class 4 impact rating—the highest available—and the Guardian Warranty even covers perforation from hailstones up to 1.5 inches, which means you're protected against damage that would total an asphalt, wood, or slate roof. Class 4 rating is tested to withstand repeated impacts equivalent to severe hail, so your roof sustains impacts that would crack or dent traditional materials. Many homeowners in hail-prone regions qualify for insurance premium reductions because aluminum's non-combustibility and impact resistance lower claim frequency; contact your insurer to ask whether Interlock's UL 2218 Class 4 rating qualifies you for a discount. In St. Croix Falls' variable spring weather, this protection is genuine peace of mind.

Question 6

Can an energy-efficiency metal roof lower cooling costs in Minnesota summers?

Accepted Answer

energy-efficient Interlock colors reflect solar heat rather than absorbing it the way asphalt does, reducing heat transmission into your attic and lowering air-conditioning load on hot days. Interlock's rated colors achieve thermal emissivity of 0.84 and solar reflectance up to 0.55 (Aged Copper Penny), which means less energy needed to cool living spaces. St. Croix Falls receives about 3073 sunshine hours annually, so cumulative heat reflection across a full season adds up. The Cool Roof Rating Council rating confirms these reflectance values under real-world weathering. While Minnesota winters are cold, reduced summer cooling demand over a 30-plus-year roof life offsets energy use, and the lightweight aluminum installation means no structural upgrades that would further increase cooling loads—unlike heavy slate or tile that require reinforcement and increase thermal mass.

Question 7

How much maintenance does a metal roof really need in Minnesota?

Accepted Answer

Interlock metal roofing requires virtually no maintenance; the Alunar 70% PVDF finish and aluminum's non-corrosive nature mean no painting, staining, or sealing cycles that asphalt, wood shake, or slate demand. You don't remove moss, algae, or debris buildup because the hard, slick surface and steep pitch shed water and organic matter naturally—critical in St. Croix Falls where about 797 mm of annual rain and 80 freeze-thaw cycles would otherwise trap moisture and accelerate decay in porous materials. No fastener replacement, no roof coatings, no structural inspections for rot. Gutters and downspouts still need seasonal clearing, but the roof itself remains inert. The CALGreen building standard verifies Interlock for reduced maintenance, and your only real task is ensuring snow guards and gutters function properly during the 97 cm average snowfall season.

Question 8

Can I install metal roofing over my existing asphalt roof without reinforcing the structure?

Accepted Answer

Yes; Interlock is extraordinarily lightweight, making structural reinforcement unnecessary in virtually all cases. The Slate and Shingle profiles install at about 0.41 lb/sq ft, and even the Mediterranean Tile profile—which replicates heavy clay or concrete tile—weighs only about 0.59 lb/sq ft, making it roughly 96% lighter than actual tile. This means you avoid the $5,000–$15,000 structural reinforcement that real slate, concrete, or clay tile typically requires. Most homes can accept Interlock directly over existing asphalt without tearing off the old roof, saving labor and landfill waste while reducing project cost and timeline. Your framing and foundation experience no additional stress, which is especially valuable if your St. Croix Falls home was built when roof-load assumptions were lower. The ICC-ES ESR-1790 evaluation confirms installation methods that ensure code compliance and structural safety.

Question 9

Is a metal roof worth the upfront cost compared to asphalt over the long term?

Accepted Answer

Yes; Interlock is typically 2–3 times asphalt's initial cost but lasts 40–60+ years versus 15–25 for asphalt, meaning you install it once and never reroof again. Across 50 years, asphalt requires 2–3 complete tear-offs and landfill disposal, while Interlock's lifetime limited warranty (non-prorated for the original owner) and 50-year transferable coverage eliminate those labor and material cycles. Factor in maintenance costs (Interlock needs almost none), energy savings from energy-efficiency reflectance over decades in St. Croix Falls' 3073 annual sunshine hours, and potential insurance discounts from UL 2218 Class 4 hail rating and non-combustibility, and the total cost per year over 50 years drops well below asphalt's recurring expense cycle. Resale value also tends to increase because buyers recognize that Interlock is the last roof they'll install.

Question 10

What makes Interlock's lifetime warranty different from other metal roof warranties?

Accepted Answer

The Guardian Warranty is a lifetime limited, non-prorated material warranty for the original owner—meaning there's no gradual reduction in coverage over time—and it covers rusting, rotting, splitting, cracking, curling, and loss of impact resistance. The warranty is one-time transferable, extending 50-year coverage to the next owner, which increases your home's appeal to buyers since they inherit half a century of protection. Interlock has been manufactured since 1998 in Delta, BC, giving real long-term performance data across diverse climates from coastal salt-air homes to an Antarctic research station. In St. Croix Falls, where about 80 freeze-thaw cycles per year and 97 cm of snow challenge roofing materials, this non-prorated coverage means you're protected against the exact stresses that degrade traditional roofs—and that protection passes to future owners, building long-term home value.

Spec / Rating	Climate / Risk Factor + What It Solves
Wind resistance: 120+ mph (193+ kph)	Extreme wind, hurricanes, storm uplift: full interlocking attachment helps prevent blow-offs, edge lifting, and panel loss in high-gust events.
Fire rating: Class A (with proper assembly)	Wildfire, embers, radiant heat, chimney sparks: non-combustible roof assembly provides the highest residential fire protection rating.
Hail resistance: UL 2218 Class 4	Hail and impact debris: highest impact classification; resists cracking, splitting, and surface loss common with asphalt under hail strikes.
Snow & ice performance: interlocking, shedding profile	Heavy snow, freeze-thaw, ice dams: smooth aluminum sheds snow efficiently and the interlocking design helps block water intrusion when melt-refreeze cycles occur. (Final snow-load capacity depends on roof structure and local code.)
Corrosion resistance: aluminum (won’t rust)	Salt air, coastal humidity, wet climates: aluminum naturally resists rust and corrosion, reducing long-term failure risk in marine or high-moisture environments.
Heat / UV durability: baked-on coating system	High heat, intense sun, thermal cycling: coatings resist UV breakdown and temperature-swing fatigue, slowing fading and surface degradation.
Moss / algae resistance: smooth coated surface	Wet shade, organic growth: low-porosity metal surface gives moss/algae less to grip, reducing staining and maintenance.
Material: heavy-gauge aluminum roof profiles (Slate / Shake / Shingle / Tile / Standing Seam)	All-season structural stability: lightweight, dent-resistant metal system stays stable through large hot-cold swings and severe weather.
Expected lifespan: 50+ years	Long-term durability across climates: avoids re-roof cycles typical of shorter-life materials, even in high-stress environments.
Warranty: Lifetime-Limited, non-prorated + 50-year transferable	Lifetime protection + resale value: guarantees long-term material confidence and transfers to future owners.

Metal Roofing in St. Croix Falls, Minnesota — Lifetime Interlock® Aluminum Shingles Installed Locally

Metal Roofing Built for St. Croix Falls's Heavy Rain, Snow Loads, Windstorms & Lifetime Protection

Performance you can measure (all climates)

Weather Resistant

Durable

Energy Efficient

Freeze–Thaw Durable

Impact Resistant

Rain & Moisture Proof

Interlock Industries (Midwest) Inc.

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