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

Mill Valley Metal Roofing Experts Installing Lifetime Interlock® Aluminum Shingles Since 2001

Metal Roofing Built for Mill Valley's Heavy Rain, Snow Loads, Windstorms & Lifetime Protection

Interlock Metal Roofing is a trusted metal roofing contractor and local installer serving homeowners in Mill Valley, Wisconsin (Milwaukee County); founded May 17, 2001, we are the exclusive authorized installer of Interlock® Lifetime aluminum roofing systems engineered for performance, beauty, and durability. The Interlock Lifetime Roofing System is ideal for Mill Valley’s climate—heavy-gauge aluminum panels shed snow and resist ice-dam damage during cold winters, withstand freeze–thaw cycles and long-term moisture exposure, and deliver fire-resistant protection where needed—while the Alunar® Coating System increases reflectivity for energy-efficient cool-roof performance in warm, sunny months. Offering roof replacement and re-roofing throughout Mill Valley, we combine the timeless looks of slate, cedar shingles, shake, Mediterranean tile, or standing seam with the strength, low maintenance, and long-term protection of metal roofs, all backed by a Lifetime Warranty.

Interlock metal roofing styles including slate, cedar, shake, tile, and standing seam in Mill Valley, Wisconsin

Performance you can measure (all climates)

Wind- and storm-resistant Interlock® metal roof rated to 193+ km/h for Mill Valley, Wisconsin

Weather Resistant

Tested to 193+ km/h (120 mph) winds

Interlock® aluminum metal roof in Mill Valley, Wisconsin backed by a Lifetime-Limited, transferable warranty

Durable

Lifetime-Limited, transferable warranty

Energy-efficient cool-roof Interlock® aluminum metal roofing in Mill Valley, Wisconsin

Energy Efficient

Reflective cool-roof lowers cooling costs

Freeze–thaw durable Interlock® metal roof for Mill Valley, Wisconsin

Freeze–Thaw Durable

Endures ~79 freeze–thaw days a year

Rain- and moisture-proof Interlock® metal roof for Mill Valley, Wisconsin

Rain & Moisture Proof

Repels ~822 mm of rain a year

UL 2218 Class 4 impact- and hail-resistant Interlock® metal roof in Mill Valley, Wisconsin

Impact Resistant

UL 2218 Class 4 — top hail rating

  • Authorized installer serving Mill Valley and Milwaukee County for Interlock® Lifetime Aluminum Roofing Systems
  • Designed for Mill Valley’s Great Lakes–influenced climate: heavy snow, freeze–thaw cycles, and periodic wind-driven storms
  • Precision weatherproof seams (profiles: slate, cedar, shake, tile) and mechanical fastening (profile: standing seam) deliver long-term leak protection during wind-driven rain events
  • Aluminum coated with the Alunar® Coating System (no visible aluminum surface) for durable, uniform finish and long-term color retention
  • Corrosion-resistant aluminum formulation minimizes damage from Milwaukee County winter road‑salt exposure and humid summer air
  • Panels tested to 193+ km/h (120+ mph) to resist severe windloads common in regional storm events
  • Advanced waterproof installation methods reduce risk of leaks during heavy rainfall and wind-driven conditions in Mill Valley neighborhoods
  • Snow-shedding panel geometry helps reduce roof snow loads and lowers ice‑dam risk during Mill Valley’s freeze–thaw cycles
  • Engineered to tolerate repeated freeze–thaw movement—fasteners, seams, and coatings resist cyclic expansion and contraction
  • Class A fire-rated available for peace of mind on properties near wooded lots and urban wildland interfaces
  • UL 2218 Class 4 impact resistance protects against hail, falling branches, and storm debris
  • Cool‑roof performance reduces daytime heat gain in hot summer spells and improves attic comfort and HVAC efficiency
  • Fully compatible with modern bracket‑mounted photovoltaic systems for clean rooftop PV integration
  • Fully recyclable aluminum and long service life support sustainability goals for Mill Valley homeowners
  • Architectural profiles reproduce slate, cedar shake, tile, or standing seam aesthetics while meeting local roofline styles
  • Low‑maintenance system with a Lifetime‑Limited transferable warranty to support long‑term resale value in the Mill Valley market

Metal roofing built for Mill Valley's climate

Averages (10-yr): ~822 mm rain and 88 cm snow per year, ~3128 sunshine hours, mean 9.4°C, typical daily-max winds ~22 km/h with gusts to 96 km/h, and ~79 freeze–thaw days per year.

  • 88 cmavg. snow / year
  • 822 mmavg. rain / year
  • 79freeze–thaw days / year
  • 96 km/hpeak wind gusts
  • 3128 hrsannual sunshine
  • 9.4°Cmean temperature

Interlock® aluminum roofing is engineered for these conditions — wind-rated to 193+ km/h (120 mph), UL 2218 Class 4 impact-rated, Class A fire-rated, and built to shed snow and resist ice dams and freeze–thaw cracking, backed by a lifetime limited warranty.

Interlock Industries (Midwest) Inc.

Hours

  • Monday9:00 AM – 5:00 PM
  • Tuesday9:00 AM – 5:00 PM
  • Wednesday9:00 AM – 5:00 PM
  • Thursday9:00 AM – 5:00 PM
  • Friday9:00 AM – 5:00 PM
  • SaturdayClosed
  • SundayClosed

Interlock Metal Roofing Wisconsin is a trusted metal roofing contractor proudly serving homeowners and businesses throughout the State of Wisconsin. Backed by decades of manufacturing and installation expertise, Interlock has earned a reputation for exceptional craftsmanship, long-term reliability, and outstanding customer care. As a specialized installer of premium aluminum and standing seam metal roofing systems, Interlock Metal Roofing Wisconsin provides exclusive lifetime roofing products engineered to perform in Wisconsin’s demanding climate — from heavy snow loads and ice dams to hailstorms, high winds, freezing temperatures, and dramatic seasonal weather swings. Built on integrity, professionalism, and superior workmanship, Interlock Metal Roofing has completed thousands of successful roofing installations across North America, helping Wisconsin property owners invest in roofing systems that are both beautiful and built to endure. Our team is known for transparent communication, efficient project execution, and meticulous installation standards, supported by industry-leading materials and comprehensive warranty protection. Interlock’s commitment to excellence is reflected in its dedication to safety, ongoing installer training, and strong customer satisfaction throughout the region. With highly trained crews and strict adherence to best practices, we deliver durable, energy-efficient roofing solutions that enhance curb appeal, increase property value, and provide decades of dependable protection against Wisconsin’s harsh winters and severe storm conditions. Whether you need a residential metal roof replacement, a commercial roofing upgrade, or a custom architectural metal roofing system, Interlock Metal Roofing Wisconsin is the trusted choice for premium lifetime metal roofing — combining proven expertise, exclusive products, and service you can count on.

Recognition GuildQuality Guildmaster Award — verified customer satisfaction (GuildQuality)

Accredited BBB Accredited A

Part of the Interlock® certified installer network →

Get a Free Metal Roof Estimate in Mill Valley, Wisconsin

Interlock® Aluminum Roofing — all-climates performance specs for Mill Valley, Wisconsin

Spec / RatingClimate / 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 4Hail and impact debris: highest impact classification; resists cracking, splitting, and surface loss common with asphalt under hail strikes.
Snow & ice performance: interlocking, shedding profileHeavy 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 systemHigh heat, intense sun, thermal cycling: coatings resist UV breakdown and temperature-swing fatigue, slowing fading and surface degradation.
Moss / algae resistance: smooth coated surfaceWet 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+ yearsLong-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 transferableLifetime protection + resale value: guarantees long-term material confidence and transfers to future owners.

Available Profiles in Mill Valley, Wisconsin:

Explore all Interlock® metal roofing systems, or see the Guardian lifetime warranty and independent testing reports.

Completed Interlock® metal roofs near Mill Valley, WI

Every marker is a real, anonymized Interlock® aluminum roof completed by a Certified Interlock Installer. Explore verified Interlock® installations near Mill Valley, Wisconsin, United States on the interactive project map and photo grid — filter by roof profile (Slate, Cedar Shingle, Shake, Mediterranean Tile, Standing Seam, Solid Copper), colour and year of completion.

4.7 / 5 — from 164 verified customer reviews in Wisconsin

What our customers are saying:

★★★★★
Review: July 20, 2016Completion: June 9, 2016

Hello Greg, I just had to drop you a line to tell you how pleased we are with the Interlock Roofing System that was installed last week. I have to admit that as good as I was hoping it would look, it turned out to be so much better than I had even hoped. We couldn’t be prouder of how our house looks now; the new roof is visually stunning. We can now breathe a huge sigh of relief, knowing that we’ll never again have to go out into the yard and pick up the pieces of asphalt shingles that would blow off of the roof after a storm or a high wind day. To boot, the very day after the roof was completed, we had someone who identified himself only as “your nosy neighbor from 10 miles down the road,” who stopped, knocked on our door and started asking questions about the roof. He was shocked to hear that it was a metal roof. He thought that we had installed a slate roof! He was very interested to hear all the facts about the roof, and suddenly I became Interlock Roofing’s most avid salesman. I brought out your business card so that he could take a picture of it with his cell phone, and he said he’d be contacting you soon. I’ve also been talking about the roof with some of the guys at work who had seen the before and after pictures that I brought in, and I’m sure that you will be hearing from some of them in the future too. Now, as much as I couldn’t be happier with contacting you and doing business with you, I have to tell you that even you will have to take a back seat to the super awesome job of your installers, Jesse and his team. To say we were blown away by these guys would be the understatement of the century. They came in like a whirlwind and started doing their thing and made astounding progress in such a short period of time, it blew us away. Jesse himself is such a great face to have attached to your company. He is professional, knowledgeable, and so personable that we knew in an instant that we were in good hands with him and his team. All of his team members were that way, and honestly, the hardest working group of guys that you will ever witness. We expected it to take anywhere from 5 days to a week to get our whole roof done. These guys had it done in 2 days and a couple of hours, and they left no stone unturned in doing the A-1 job that was promised. They even fixed a couple of cosmetic items on our existing siding to boot! What a great bunch of guys. And let me reiterate one more time,…Interlock, as a company, should feel confident and proud to have Jesse and his team representing them. I’m positive you will never find a better team to install your product than them. Again, thank you for the product and the work that you’ve done. You now have not only a very satisfied customer in us, but you also have a couple of very enthusiastic ambassadors for Interlock Roofing Systems.

★★★★★
Review: June 17, 2017Completion: February 17, 2017

I have made, and continuously still make, numerous recommendations to family & friends to install a Interlock roof. And, I have produced pictures on demand that I stored on my smart phone. If possible, I would be appreciative if I could get the drone footage that Jesse had taken after the finishing of the installation. I believe it would be a great selling point coming from a true customer to help propel the Interlock name. There are just a couple areas on the roof that the installation crew could have touched-on during the installation, but overall the roof looks simply amazing. Quality certainly displays the professionalism the installers had put into their work. Since the installation of our new roof, we have received numerous compliments from many of our neighbors that walk around our subdivision, plus a handful of neighbors in the adjoining subdivisions. Many questions have been asked with many answers given. We are definitely happy with our new Interlock roof. We have NOT once questioned or second guessed our decision to install an Interlock roof. It is one of the best decisions we have ever made for re-investing in our home...Thank you, Interlock!

★★★★★
Review: June 8, 2008Completion: November 30, 2007

I never really thought I could be thrilled about a roof, but I have to tell you; our new Interlock roof is beautiful! It adds true elegance to our home. We know it adds value as well, and the fact that we will never need to re-roof again is a definite advantage. Everyone within our organization, from the initial phone contact to the installation crew, was courteous and pleasant to work with. The install went smoothly and the crew kept the site clean from beginning to end. Everybody we have shown our Interlock roof to has seemed quite impressed also. We would (and in fact have already done so) recommend Interlock Roofing to others.

★★★★★
Review: July 20, 2016Completion: November 13, 2008

Excellent roof! Looks good! The installers were courteous and professional. Put the tarp all around the house and kept the site very clean. I was impressed with their super service. They bent over backward to please us. The A-Team of Roofing! When it rains, it is NOT any louder, and we are in a wind zone, and shingles have not blown off, and we have had the roof since 2008. The snow slides off, too! And the salesman knows his product and explains it well. It will add value to the house. Unlike asphalt, that's like tar and paper, and doesn't hold up. The Interlock Lifetime Roof is super durable!d Greg Weber the salesman, knows his product and explains it well. It will add value to the house. Unlike asphalt, that’s like tar and paper and doesn’t hold up. The Interlock Lifetime Roof is super durable!

★★★★★
Review: May 17, 2017Completion: August 10, 2009

We purchased our roof in 2009 and as you can see from the pictures taken in May of 2017, our roof looks as new as the day we bought it. Here are the things we have noticed most about our Interlock Lifetime Roof over the last 8 years. It keeps our house much cooler in the summer than the asphalt roof we used to have. It really sheds snow, and the snow guards work great. We never need to use a snow rake. We love the durability and the curb appeal. Greg Weber our representative, who we were enthused to learn, is still with the company. When we saw him in 2009 he laid out all the variables in a professional way and our Interlock Roof has lived up to all of our expectations and promises he made. All companies promise results, service, and quality. Interlock delivers.

★★★★★
Review: May 16, 2017Completion: July 31, 2008

The installation was super smooth. Every installer was courteous and professional. We get lots of compliments, and people stop by all the time to admire it. One of the biggest misconceptions about metal roofing is people think it’s loud. Our Interlock roof is very silent. The only way I know if it’s raining is if I look out a window. Also, the snow just slides off. We are also in a wind tunnel area, and we have never lost an Interlock shingle, and we have had the roof for many years. We were so pleased with our Interlock roof that we put the same roof on our lake home in northern Wisconsin. We get a lot more snow up there and the Interlock’s snow-shedding performance capabilities are second to none on that roof, too!

★★★★★
Review: April 10, 2017Completion: March 17, 2015

I love the roof! It looks great, and the squirrels that we’re crawling all over my old asphalt roof slide right off it. The snow slides off, too. I hope to get some $500 referrals. The crew was terrific, hardworking, courteous, polite, and clean.

★★★★★
Review: April 23, 2009Completion: May 5, 2008

Drip, drip, drip. This is not a sound you want to hear at 3:30 am… in bed… coming from your attic… in the dead of winter. A quick peek in the attic confirmed my worst fears, the ice dam on the roof was allowing melted water to seep through the crappy asphalt shingles and into the house. We called a local contractor and had the ice dam removed, but this didn’t fix the underlying problem that our current roof was cheap and damaged. My wife and I moved into a beautiful three-story brick Tudor on Madison’s near west side in the fall of 06′. It was perfect in that it had been beautifully remodeled with gorgeous woodwork, marble, and stunning attention to detail, with the exception of the roof. We had decided that, barring any unforeseen circumstances, this was the house we were going to stay in until retirement, so why not invest in a metal roof. After a couple of weeks of research and interviewing, we settled on Interlock. Part of the choice was made on the quality of the product, and part was made on the salesmanship of the rep, Chuck. Work started and except for some problems with the weather, things progressed smoothly. We were especially impressed with the steps the crew took in regard to safety, and our stay-at-home neighbor told us about how exciting the crew was, “you’re definitely getting your money's worth,” was her exact quote. At the end of the job, the crew even emptied all the trash we had pulled out of the attic for us. Now that’s service! After everything is said and done, we’ve been able to cap off our gorgeous house with an equally gorgeous roof.

★★★★★
Review: April 16, 2026Completion: February 20, 2009

I had Interlock put on a beautiful red slate roof 17 years ago.The roof still looks beautiful. 5 years ago, I had them also re-roof my garage with the same type of slate. The roofs look gorgeous and I have no maintenance whatsoever.I get complements all the time. The guy whom I contracted with was named "Tim' but has since died. He was a really nice guy. Back in 2009, the roof was much cheaper. ( I actually paid more for the garage 5 years ago!) I am extremely happy with the roofs. The guys did a wonderful job, replacing rotted boards where necessary. They also told me about very cheap gutters I could buy at Menards instead of those ridiculously - priced "special" gutter systems. I bought them and they placed them on my buildings.This home will go to my daughter one day; I do not want her to have to lift a finger. Note that I had an asphalt roof previously. It lasted only 12 years. The shingles curled up under the sun and cracked. They looked terrible. I can honestly say that these metals roofs by Interlock are very much worth what you pay for them. They will last a lifetime with almost no maintenance. Instead of replacing a roof every 15 years and paying lots for asphalt or fiberglass, their metal roofs last very long and you will never have to re- roof again.

★★★★★
Review: May 16, 2017Completion: September 24, 2014

Dear Interlock Lifetime Roofing Systems: We purchased our Interlock Lifetime Roof in June 2014. We are very happy with the look, durability of the material, and finish. After a snowfall, the heat of the sun will warm the roof and allow the snow to shed from the roof. We have a great sense of security, knowing it can withstand higher winds than conventional asphalt. In fact, our neighbors lost many shingles in the last major wind storm, and our Interlock roof proved to be the high wind resistance product it is with all shingles intact. We love the fact it’s more reliable and has peace of mind knowing it has lots of longevity and will look brand new not only now but down the road. We also received a discount on our homeowner’s insurance. Overall, we were very satisfied with our sales representative Greg Weber, the company, the service, and the product.

★★★★★
Review: May 10, 2017Completion: March 20, 2017

In March 2017 we had an Interlock Lifetime Roof installed. Greg Weber, the salesman, was not pushy. We were very impressed with his salesmanship and the product. He also offered to have the Interlock product put on our wishing well in the front yard. That was something we really appreciated. The clean-up was excellent! Many neighbors and people who " data-wpil-keyword-link="linked">walk by the house have noticed the roof and asked a lot of questions. We have gotten lots of compliments!

★★★★★
Review: April 10, 2017Completion: February 23, 2017

The Interlock crew was able to take some extra time to coordinate with another contractor for solar installation. As a result, the final the result looks great and very functional. The materials used are very high quality, and they worked efficiently and cleaned up when finished.

Read all Wisconsin metal roofing reviews →

Nearby service areas in Milwaukee County

Interlock® metal roofing is also installed in these communities near Mill Valley:

Interlock Industries (Midwest) Inc. also services nearby States

Beyond Mill Valley, our team installs Interlock® metal roofing across:

Metal Roofing FAQs for Homeowners in Mill Valley

The following metal roofing FAQs are designed specifically for homeowners in Mill Valley, Wisconsin. Whether you are building a new home or replacing an existing roof, understanding how roofing materials perform in local weather conditions is essential. From wind and storm protection to fire resistance, hail impact, snow loads, and coastal moisture exposure, Interlock’s Lifetime Aluminum Roofing System is engineered to provide long-term durability, energy efficiency, and peace of mind in Mill Valley.

How does a metal roof handle 88 cm of Wisconsin snow without ice dams?

Metal roofs shed snow and ice effectively because the smooth, hard surface doesn't trap moisture the way asphalt does—snow simply slides off once enough weight accumulates. In Mill Valley's climate with about 88 cm of annual snowfall and roughly 79 freeze-thaw cycles per year, this matters: ice dams form when heat escapes through poor insulation and refreezes at the eaves, but a metal roof stays cold and uniform, so melt-water drains cleanly. Four-way interlocking Interlock panels also resist wind uplift during the snow load and thaw cycles that stress seams.

Will Wisconsin's freeze-thaw cycles crack or damage aluminum panels?

No. Aluminum expands and contracts with temperature swings, but it does so predictably and uniformly—the 3105-H24 alloy used in Interlock panels is engineered for thermal cycling. With about 79 freeze-thaw days per year in Mill Valley plus roughly 822 mm of annual rain, your roof faces constant moisture and temperature stress, but aluminum's oxide layer self-heals when scratched and cannot rust or rot like asphalt, wood, or steel. The Alunar 70% PVDF coating—warranted 30 years against chalking—protects against UV and salt-air degradation during those rapid freeze cycles.

Why choose aluminum instead of steel metal roofing in a rainy climate?

Aluminum roofing cannot rust because it contains no iron; instead, a thin oxide layer forms naturally and actually heals itself when the surface is scratched or damaged. Steel roofing, by contrast, rusts from the inside out once its protective layer is breached—a real risk in Wisconsin's wet climate with 822 mm of rain annually. Interlock panels use roofing-grade 3105-H24 and 3003-H24 aluminum alloy (ASTM B209), and the two-sided Alunar 70% PVDF fluorocarbon coating adds 30 years of fade and chalk resistance, so you're protected against corrosion for the life of the roof without ongoing maintenance.

Can a metal roof stand up to Mill Valley's wind gusts?

Yes. Interlock panels are warranted to resist winds up to 120 mph when installed to specification—well beyond the gusts typical for this region, which average about 22 km/h daily but can reach 96 km/h. The four-way interlocking system locks each panel to its neighbors on all sides, preventing lift-off and edge flutter during storms. Mill Valley's variable spring and fall weather, combined with winter wind pressure from snow load, demands a roof that won't shift or separate; the mechanical lock design handles that directly, without relying on adhesive or exposed fasteners that degrade over time.

Do I need to reinforce my house's structure for a metal roof?

No structural reinforcement is needed. The Interlock Shake profile, for example, installs at about 0.58 lb/sq ft, and the Mediterranean Tile—which looks like heavy clay or concrete—weighs roughly 96% less than the real thing while delivering the same aesthetic. Most homes can accept this weight directly over existing asphalt or wood shingles without framing upgrades. That lightweight design also means installation is faster and safer, and it reduces long-term stress on your home's structure through countless freeze-thaw cycles—a significant factor when you're dealing with about 79 of those per year in Mill Valley.

What's the hail rating on Interlock metal roofing, and will insurance notice?

Interlock panels carry a UL 2218 Class 4 impact rating—the highest available—and the Guardian Warranty even covers perforation from hailstones up to 1.5 inches. That credential alone can qualify you for insurance discounts from some carriers, since Class 4 means your roof is less likely to file a claim. Wisconsin's weather includes severe spring storms, and hail is a real risk; having a roof that absorbs impact without losing its water-shedding ability gives your insurer confidence. Check with your agent about discounts once your new Interlock roof is installed—many do offer them for impact-rated products.

Does metal roofing really save energy in Wisconsin?

Metal roofing can reduce cooling costs noticeably if you choose an energy-efficient color. Interlock offers colors with solar reflectance up to 0.55 and thermal emissivity of 0.84—meaning they bounce summer heat away rather than absorbing it like asphalt does. In Mill Valley, with about 3,128 annual sunshine hours and warm summer weather, that reflection lowers attic temperature and AC load. Winter heating loss through the roof is managed by proper insulation, not the metal itself. The net effect: lower cooling bills in summer without penalty in winter, plus the light weight means your HVAC doesn't work as hard pulling heat through a lighter assembly.

How much maintenance does an Interlock metal roof actually need?

Minimal. Aluminum won't rot, split, curl, or crack like asphalt, cedar shake, or tile do—especially under Wisconsin's 79 annual freeze-thaw cycles. You'll rinse debris twice a year and check gutters after storms, but there's no re-coating, no nail popping, no moss treatment, and no seasonal repairs. The two-sided Alunar 70% PVDF coating keeps its color for 30 years, so you won't see the fading and chalking that forces asphalt roof repainting. In a climate with 822 mm of rain and 88 cm of snow per year, the low-maintenance advantage becomes real savings—no call-outs for leaks or damage that plague older roof types.

What does Interlock's lifetime warranty actually cover?

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. When you sell, it transfers once to the next owner for 50 years from completion, adding resale appeal. No other roof type matches this term; most asphalt or wood roofs need replacement in 15–25 years, and tile roofs, though long-lasting, can crack in freeze-thaw cycles. Because Interlock panels are manufactured from non-corrosive 3105-H24 aluminum with a two-sided 30-year-warranted coating, the warranty isn't marketing—it reflects material reality in a climate like Mill Valley's with intense seasonal stress.

Is metal roofing more expensive than asphalt when you look at the full cost?

Upfront cost is higher, but life-cycle cost favors metal decisively. An asphalt roof in Wisconsin typically lasts 15–20 years in a climate with 822 mm rain, 88 cm snow, and 79 freeze-thaw cycles per year—meaning you'll replace it at least twice while an Interlock roof (with its lifetime warranty and non-corrosive aluminum) lasts indefinitely. Add up material, labor, and disposal for two or three asphalt replacements, plus maintenance calls for repairs and algae treatments, and the total often exceeds a single metal roof installation. You're buying the last roof you'll install on that house, which buyers recognize and reward at resale.

Is a metal roof a good choice for Mill Valley’s climate?

Yes. Mill Valley averages about 88 cm of snow, 822 mm of rain, roughly 79 freeze–thaw days a year, with peak wind gusts near 96 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.

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