Metal Roofing in Stewart, Wisconsin — Lifetime Interlock® Aluminum Shingles Installed Locally
Stewart Metal Roofing Experts Installing Lifetime Interlock® Aluminum Shingles Since 2001
Metal Roofing Built for Stewart's Heavy Rain, Snow Loads, Windstorms & Lifetime Protection
Interlock Metal Roofing is a trusted metal roofing contractor and the exclusive authorized installer of the Interlock® Lifetime Roofing System, serving homeowners in Stewart, Wisconsin (Dane County) since May 17, 2001. We provide roof replacement and re-roofing throughout Stewart using heavy-gauge, fire-resistant, energy-efficient cool aluminum roofs engineered for performance, beauty, and durability—built to shed heavy snow, resist ice-dam and freeze–thaw damage, withstand seasonal winds, and reflect summer UV heat common in Dane County. Choose the timeless look of slate, cedar shingles, shake, Mediterranean tile, or standing seam with the strength of metal, protected by the Alunar® Coating System and backed by a Lifetime Warranty for homes in Stewart, Wisconsin.

Performance you can measure (all climates)
Weather Resistant
Tested to 193+ km/h (120 mph) winds
Durable
Lifetime-Limited, transferable warranty
Energy Efficient
Reflective cool-roof lowers cooling costs
Freeze–Thaw Durable
Endures ~81 freeze–thaw days a year
Rain & Moisture Proof
Repels ~760 mm of rain a year
- 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 panels finished with the Alunar® Coating System — no visible aluminum surface — for sustained corrosion resistance and color retention across Stewart roofing exposures.
- Tested wind performance (industry-rated to withstand severe windloads) provides resilience against Midwestern windstorms that impact Stewart and Dane County.
- Designed to handle heavy snow loads common in Stewart; snow-shedding panels reduce roof load and limit prolonged snow buildup.
- Built for repeated freeze–thaw cycles and seasonal ice movement in Dane County; engineered flashings and joint tolerances reduce fatigue and water intrusion.
- Rapid spring snowmelt protection: continuous underlayment and optimized drainage paths prevent leaks during fast melt events typical after Stewart winters.
- Class A fire-rated available for homeowners seeking enhanced ember and flame resistance near rural brush and agricultural fields.
- UL 2218 Class 4 impact resistance guards against hail, falling branches, and rooftop projectiles during severe storm events.
- Cool-roof reflectivity and the Alunar® finish lower attic heat gain during summer heat waves, improving year‑round energy performance for Stewart homes.
- Solar-ready panel geometry accepts bracket-mounted photovoltaic arrays without compromising the coating or weatherproof seams.
- Low-maintenance, non-porous surface resists moss and biological growth in shaded, moisture-prone areas around Stewart properties.
- Architectural profiles replicate slate, cedar shake, and tile while delivering the structural durability required for inland Wisconsin climates.
- Recyclable aluminum construction reduces life-cycle waste compared to asphalt shingles and supports sustainable home stewardship in Dane County.
- Transferable Lifetime-Limited warranty supports long-term homeowner protection and resale value for Stewart residences.
Metal roofing built for Stewart's climate
Averages (10-yr): ~760 mm rain and 98 cm snow per year, ~3073 sunshine hours, mean 8.5°C, typical daily-max winds ~22 km/h with gusts to 97 km/h, and ~81 freeze–thaw days per year.
- 98 cmavg. snow / year
- 760 mmavg. rain / year
- 81freeze–thaw days / year
- 97 km/hpeak wind gusts
- 3073 hrsannual sunshine
- 8.5°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.
- 2355 Fairview Ave N, Roseville, MN 55113, United States
- Phone 414-348-8870
- Local lines Minnesota 612-800-8686
- Sales & Marketing sales@minnesotametalroofing.com
- Toll-Free 1-866-733-5811
- Customer Service mwservice@interlockroofing.com
- www.WisconsinMetalRoofoing.com
- Also wisconsinmetalroofing.commidwestmetalroofing.com
- License WI #898136
- EPA Lead-Safe Certified Firm #NAT-F224594-2
- Serving Wisconsin since 2001 — 25 years
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
Get a Free Metal Roof Estimate in Stewart, Wisconsin
Interlock® Aluminum Roofing — all-climates performance specs for Stewart, Wisconsin
| 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. |
Available Profiles in Stewart, Wisconsin:
Explore all Interlock® metal roofing systems, or see the Guardian lifetime warranty and independent testing reports.
Recent Interlock® roofs across Wisconsin
Completed Interlock® metal roofs near Stewart, WI
Every marker is a real, anonymized Interlock® aluminum roof completed by a Certified Interlock Installer. Explore verified Interlock® installations near Stewart, 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.
Open Stewart on the interactive project map →Browse all Interlock® projects in Wisconsin →See more Interlock® projects →
What our customers are saying:
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.
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!
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.
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!
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.
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!
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.
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.
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.
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.
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!
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.
Nearby service areas in Dane County
Interlock® metal roofing is also installed in these communities near Stewart:
Interlock Industries (Midwest) Inc. also services nearby States
Beyond Stewart, our team installs Interlock® metal roofing across:
Metal Roofing FAQs for Homeowners in Stewart
The following metal roofing FAQs are designed specifically for homeowners in Stewart, 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 Stewart.
Will a metal roof hold up to Wisconsin's freeze-thaw cycles?
Yes—aluminum actually improves with freeze-thaw exposure. Stewart experiences about 81 freeze-thaw days per year, a condition that cracks asphalt, splits wood shakes, and spalls concrete or clay tile. Aluminum's oxide layer self-heals when scratched, and the 3105-H24 alloy (ASTM B209) resists the micro-fracturing that destroys brittle materials. Four-way interlocking panels accommodate thermal expansion without joint failure, and the Alunar 70% PVDF fluorocarbon coating (warranted 30 years) prevents coating breakdown—the real culprit in cold climates. You're investing in a roof that strengthens under the exact conditions that age out asphalt.
How does a metal roof handle Stewart's snow load and ice dams?
Metal roofing sheds snow and ice far more effectively than asphalt because aluminum conducts and radiates heat uniformly across the panel surface, reducing the insulation-melt-refreeze cycle that creates ice dams. With about 98 cm of snow annually in Stewart, the light weight of Interlock panels—the Slate profile at 0.41 lb/sq ft—means your home's structure bears no additional load even after heavy accumulation. The four-way interlocking design keeps panels locked during thermal cycling, and snow guards can be added if you prefer controlled shed rather than full release. Unlike slate or tile, which are heavy and trap ice, aluminum's thermal conductivity and negligible weight make it the practical choice for Wisconsin winter conditions.
Can Interlock Metal Roofing withstand Stewart's wind gusts?
Absolutely. Stewart experiences typical daily-max winds around 22 km/h with gusts up to 97 km/h—well within Interlock's 120 mph (193 km/h) wind-resistance warranty when installed to specification. The four-way interlocking aluminum panels lock together on all sides, creating a unified diaphragm that distributes wind load across the entire roof plane rather than failing at fastener points like shingles do. This redundant interlocking system has proven itself in coastal salt-air installations since 1998 and at an Antarctic research station—environments far harsher than Dane County wind. Your roof won't lift, flutter, or separate during Wisconsin's peak gusts.
Is Interlock Metal Roofing worth the upfront cost over asphalt?
Metal roofing is the last roof you buy; asphalt is not. Asphalt shingles typically last 15–20 years in Wisconsin's ~81 freeze-thaw cycles per year—meaning you'll replace it 2–3 times in a 60-year lifespan. Each tear-off adds labor, landfill fees, and disposal costs. Interlock's lifetime limited warranty for the original owner covers rusting, rotting, splitting, cracking, curling, and impact loss; the one-time transferable benefit extends 50 years from completion to the next owner. Over 60 years, you avoid 2–3 asphalt replacement cycles, their associated labor, the environmental cost of repeated landfill disposal, and repeated disruption to your home. The initial premium shrinks dramatically when spread across decades of zero-replacement ownership.
Does Interlock Metal Roofing get insurance discounts, and how does it handle hail?
Interlock achieves UL 2218 Class 4 impact rating—the highest available—and the warranty specifically covers perforation from hailstones up to 1.5 inches. Class 4 rating qualifies for insurance discounts in many Wisconsin carriers because it demonstrates impact durability far beyond asphalt or wood shake (both Class 1 or unrated). The rigid 3105-H24 aluminum alloy (ASTM B209) dissipates impact energy across the interlocking panel system rather than fracturing or denting like brittle tile. Stewart's hail exposure is typical for the region, but when a storm hits, your roof won't crater, separate, or require claims documentation. Contact your insurer about specific discount amounts—they vary—but the UL 2218 Class 4 rating gives you a concrete negotiating point.
How much maintenance does an Interlock metal roof actually require?
Almost none. Asphalt shingles require inspection and seal-coating every few years; wood shakes need retreating to prevent rot and splitting; slate and tile require repointing and individual piece replacement. Interlock aluminum requires only twice-yearly gutter cleaning and removal of roof debris—the same maintenance you'd do anyway. The Alunar 70% PVDF fluorocarbon coating (both sides, warranted 30 years) resists the chalking and fading that forces asphalt repainting. In Stewart's ~3073 annual sunshine hours and 760 mm of rain, the self-healing oxide layer and fluorocarbon finish prevent the UV breakdown and moisture penetration that age other materials. Your roof simply weathers—no special treatments, no sealants to renew, no seasonal inspections for cracks or curling.
Will a metal roof help lower cooling costs in summer?
Metal roofing reduces cooling load by reflecting rather than absorbing solar heat. Interlock's energy-efficient colors achieve thermal emissivity of 0.84 and initial solar reflectance up to 0.55 (Aged Copper Penny profile)—meaning they bounce heat away rather than converting it to warmth inside your attic. In Stewart's ~3073 annual sunshine hours, this reflectance advantage compounds across spring, summer, and early autumn, lowering air-conditioning runtime and cost. Cool Roof Rating Council rating confirms measurable performance. Asphalt shingles, by contrast, absorb heat and radiate it into your home. While Wisconsin winters are cold (mean 8.5°C), the energy benefit extends through shoulder seasons when cooling is welcome, and the reflectance doesn't penalize winter heating—aluminum's thermal properties work year-round to even out demand.
Is Interlock Metal Roofing actually better for the environment?
Yes, because it breaks the asphalt tear-off-to-landfill cycle. Asphalt shingles are single-use: after 15–20 years in Wisconsin's ~81 freeze-thaw cycles, you remove them and send them to landfill, then manufacture and transport new shingles. Interlock aluminum is approximately 95% recyclable at end of life—far beyond its 60+ year lifespan. The roofing-grade 3105-H24 / 3003-H24 alloy (ASTM B209) carries no manufacturing debt because aluminum's oxide layer is permanent and requires no replacement. You install once, then recycle aluminum into new products, avoiding the embodied carbon of repeated manufacturing and the pollution of landfill decomposition. The Guardian Warranty ensures your roof outlasts multiple asphalt cycles, dramatically reducing the environmental impact per year of protection.
Does Interlock have installers serving Stewart?
Yes. Interlock Metal Roofing has been serving the Stewart region since 2001, giving local customers 20+ years of installation expertise and warranty support. The company manufactures panels in Delta, BC, ensuring consistent quality and fast supply without lengthy lead times. Local installation means your roof project stays under the supervision of installers who know Dane County's climate extremes—the 760 mm annual rainfall, ~98 cm snow, 97 km/h gusts, and 81 freeze-thaw days per year—and can specify snow guards, flashings, and underlayment appropriate to those conditions. The Guardian Warranty is honored locally, so claims, inspections, and any service requests are handled by the team that installed your roof.
Can Interlock Metal Roofing install over my existing asphalt roof?
Yes. The extraordinary light weight of Interlock panels—as little as 0.41 lb/sq ft for the Slate profile, roughly 96% lighter than concrete or clay tile—means installation over most existing roofs requires no structural reinforcement. Your installer removes only the topmost asphalt layer, preserving the deck and underlayment, which reduces labor cost and debris disposal. The ICC-ES evaluation report ESR-1790 (reissued 2025 for IBC/IRC compliance) explicitly permits this retrofit approach. New underlayment can be added if needed, and the four-way interlocking panels secure to your existing roof deck with corrosion-resistant fasteners. The installation timeline is typically shorter than traditional tear-off-and-replace, minimizing disruption and the cost of dumping old shingles from your Stewart home.
Is a metal roof a good choice for Stewart’s climate?
Yes. Stewart averages about 98 cm of snow, 760 mm of rain, roughly 81 freeze–thaw days a year, with peak wind gusts near 97 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.













