Question 1

How does metal roofing handle heavy snow and ice buildup in Minnesota winters?

Accepted Answer

Interlock metal roofing sheds snow and ice more effectively than asphalt because the smooth, hard surface prevents moisture from bonding. With Davis averaging about 94 cm of snow annually and roughly 76 freeze-thaw cycles per year, that matters: as temperatures swing above and below freezing, water works into asphalt seams and cracks, but aluminum's oxide layer stays impermeable. The four-way interlocking panels lock together so tightly that ice dams have nowhere to form at seams. Snow guards are available if you want to control sliding on steep pitches, but the metal itself won't degrade from the constant freeze-thaw punishment that ages asphalt shingles in half the time.

Question 2

Why can't an aluminum metal roof rust, and why is that important for Minnesota?

Accepted Answer

Aluminum contains no iron, so rust is physically impossible—that's not marketing, that's metallurgy. Instead, aluminum forms a microscopic oxide layer that actually repairs itself when scratched or exposed. In Wright County's freeze-thaw climate with 562 mm of annual rainfall, the aluminum won't corrode from moisture or salt carried by winter de-icing runoff. Steel roofing, by contrast, relies on a paint coating to prevent rust; when that coating chips or fades, rust begins and spreads underneath. Interlock uses 3105-H24 and 3003-H24 roofing-grade aluminum with a 30-year Alunar coating on both sides—double-sided protection that steel roofing doesn't offer. Over a 50-year roof life, aluminum eliminates the corrosion gamble entirely.

Question 3

Does a metal roof stay secure in Wright County's spring and winter winds?

Accepted Answer

Yes. Interlock panels are warranted to resist wind speeds up to 120 mph, and Davis sees typical gusts around 112 km/h (about 70 mph)—well within that rating. The four-way interlocking design is key: each panel locks to its neighbors on all sides, so individual panels can't lift or separate when wind tries to peel them back. The edges and seams are the weak points on asphalt shingles; Interlock eliminates those weak points through mechanical interlocking rather than adhesive alone. During the severe wind events that periodically hit Minnesota, the roof stays put while asphalt shingles may curl, split, or blow off. That durability translates to fewer repairs and no insurance claims for weather damage.

Question 4

Can my home's roof structure support metal roofing, or do I need expensive reinforcement?

Accepted Answer

Almost certainly not—no reinforcement needed. The Interlock Shake profile weighs only about 0.58 lb per square foot, and the Mediterranean Tile profile just 0.59 lb/sq ft—roughly 96% lighter than actual concrete or clay tile. Compared to the three to four layers of asphalt already on most Minnesota homes, metal is roughly equal in weight or lighter. Homes are already framed to carry whatever you remove and replace, so the structural math works. The ICC-ES evaluation report ESR-1790 covers installation on existing roof structures, and the material is often installed directly over old asphalt with a solid underlayment—no tearing off, no added cost, no engineer required. That simplicity also means faster installation and lower labor cost.

Question 5

What's the hail rating on Interlock roofing, and could it lower my insurance premiums?

Accepted Answer

Interlock metal roofing carries a UL 2218 Class 4 impact rating—the highest available. The warranty even covers perforation from hailstones up to 1.5 inches across, a level of impact resistance that standard asphalt shingles cannot match. Several Minnesota insurers recognize that durability and offer discounts on homes with Class 4 metal roofs, since claims for hail damage become unlikely. To get those savings, you'll need to provide your insurer with the UL 2218 documentation—ask your installer for it. Over a 50-year roof life, avoiding even one or two major hail claims can repay the roof investment several times over. Check with your current agent whether your specific policy qualifies for a metal roof discount; many do.

Question 6

How much upkeep does a metal roof need compared to asphalt or traditional tile?

Accepted Answer

Aluminum metal roofing is virtually maintenance-free. Unlike asphalt shingles, which degrade, curl, and require periodic replacement, or wood shakes, which split and rot, or clay tile, which needs mortar repointing, Interlock panels simply last. The solid aluminum surface sheds debris; there's no granule loss or deterioration to worry about. In Davis's climate with 94 cm of snow and 562 mm rain per year, the panels just shed water and stay intact. The coating is warranted 30 years against chalking and fading, measured to ASTM D4214 standards—so even after three decades, you're not repainting or resealing. An occasional gutter cleaning and removal of heavy debris is all most homeowners do. That's dramatically less work and cost than the periodic repairs asphalt and tile demand.

Question 7

What warranty comes with Interlock roofing, and how long does it really last?

Accepted Answer

The Guardian Warranty is a lifetime limited material warranty for the original owner—non-prorated, meaning it covers the same defects at year 49 as it does at year one. It covers rusting, rotting, splitting, cracking, curling, and loss of impact resistance. For the next owner, it's a one-time transferable 50-year limited warranty from completion. That transferability adds real value at resale; buyers know they're inheriting decades of roof life with no hidden risk. In a freeze-thaw environment like Davis, where 76 annual freeze-thaw cycles test roofing materials relentlessly, that promise matters. Aluminum won't rust or rot, so the warranty isn't betting on hidden corrosion. Interlock has manufactured panels since 1998 and installed them everywhere from coastal salt-air homes to an Antarctic research station—the warranty reflects real-world performance data across 25+ years.

Question 8

How long does installation take, and can you install Interlock over my existing roof?

Accepted Answer

Most residential installations take 1–3 days, depending on roof size and complexity. Yes, Interlock installs directly over existing asphalt shingles in the vast majority of cases—no tear-off required, which saves thousands in labor and disposal costs. You keep your old roof as extra insulation and sound dampening, and the installation crew simply fastens the metal panels over it. The installer will add an underlayment and secure everything according to the ESR-1790 code evaluation, which covers the standard process. Some homes need removal if the existing roof is severely damaged or if local code requires it; your installer will inspect and advise. The faster installation also means less disruption to your daily routine and lower overall project cost. Interlock has been serving the region since 2001, so the crew knows what works on Wright County homes.

Question 9

Is metal roofing actually better for the environment than asphalt shingles?

Accepted Answer

Yes—it eliminates the tear-off-to-landfill cycle that repeats every 15–20 years with asphalt. When asphalt shingles wear out, they're hauled to landfill; a typical roof produces 4–5 tons of waste. Interlock aluminum is approximately 95% recyclable at end of life, and aluminum recycling is economically viable—scrap value means old panels are actually worth recovering. Over a 50-year roof life, you install asphalt three times, sending 12–15 tons to landfill; with Interlock, you install once and everything's recyclable. The aluminum itself is roofing-grade 3105-H24 and 3003-H24 alloy, chosen for durability, not virgin raw material use. The product is CALGreen-verified for reduced maintenance impact. In a climate like Davis, with 562 mm rain and 94 cm snow, durability that outlasts cheaper alternatives by decades is the most sustainable choice you can make.

Question 10

Does metal roofing offer better fire protection than asphalt shingles?

Accepted Answer

Interlock aluminum is non-combustible and available in Class A fire classifications—the highest fire rating available. Asphalt shingles are combustible and carry a Class C rating at best. In a wildfire scenario, aluminum won't ignite or contribute fuel to a fire spreading across your roof, whereas asphalt shingles actively burn. The ICC-ES evaluation ESR-1790 documents the non-combustible performance, and Class A certification is available for any profile you choose—Slate, Cedar Shingle, Shake, Standing Seam, or Mediterranean Tile. Your homeowner's insurance may recognize this and offer discounts on fire-prone properties. In Wright County, where winter winds can gust to 112 km/h and fire spreads rapidly in dry conditions, having a non-combustible roof surface is one less risk to manage. It's a feature that pays dividends in safety and may pay dividends in insurance rates.

Question 11

Is a metal roof a good choice for Davis’s climate?

Accepted Answer

Yes. Davis averages about 94 cm of snow, 562 mm of rain, roughly 76 freeze–thaw days a year, with peak wind gusts near 112 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.

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 Davis, Minnesota — Lifetime Interlock® Aluminum Shingles Installed Locally

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