Metal Roofing in Westmont, Illinois — Lifetime Interlock® Aluminum Shingles Installed Locally

Yes—aluminum actually improves in freeze-thaw conditions. With about 82 freeze-thaw days per year and roughly 73 cm of snow, your roof cycles between wet and frozen constantly. Aluminum has no grain structure that cracks under repeated expansion and contraction the way asphalt and wood do. The material is rated to ICC-ES ESR-1790 standards for the International Building Code, meaning it's tested and certified for exactly this climate. The self-healing oxide layer on the aluminum surface means minor scratches from ice or snow don't expose bare metal to corrosion—the oxide regenerates automatically.

Metal panels shed snow faster than asphalt because the smooth surface has less friction and the lightweight aluminum won't sag under load. With about 73 cm of snow falling annually in DuPage County, that matters. The four-way interlocking design keeps each panel locked to its neighbors, so snow movement doesn't separate seams or lift edges where ice can get underneath. Snow guards are available if you want to control avalanche effect on lower roofs or walkways. The real advantage: there's no wood substrate underneath to rot if water does back up, and the aluminum won't split from ice pressure—it flexes and then returns to shape.

Aluminum cannot rust because it contains no iron—that's just chemistry. What happens instead is a naturally forming oxide layer that protects the bare metal underneath, and when the coating gets scratched, that oxide layer heals itself. The Alunar 70% PVDF fluorocarbon finish is applied to both sides of every panel and carries a 30-year warranty against chalking and fading (ASTM D4214/D2244 measured), which protects that oxide layer from UV and salt air. Westmont gets about 993 mm of rain per year—enough moisture to trigger corrosion in steel—but aluminum just doesn't corrode the way steel does. You're buying a roof that simply cannot rust, even after decades.

The warranty covers wind speeds up to 120 mph, which is well above the typical 97 km/h gusts recorded here. The four-way interlocking aluminum panels lock each sheet to the ones beside and below it, so wind trying to lift an edge encounters resistance from four directions at once. That's why the system performs so well in coastal installations and at Antarctic research stations where conditions are far harsher than Westmont's average daily-max winds of about 19 km/h. The panels are installed over solid deck with the full system engineered as one unit, not just fastened at the ridge. Standard installation to spec means you have wind resistance built in, no special reinforcement needed.

Interlock metal roofing carries a UL 2218 Class 4 impact rating—the highest available—and the warranty covers perforation from hailstones up to 1.5 inches. That's real-world protection: aluminum is dent-resistant (small dents don't affect function or waterproofing), and the material won't shatter or develop cracks that spread over time like asphalt or slate do. Some homeowners have reported insurance discounts because the roof is so impact-resistant and lasts longer than asphalt, which means fewer claims overall. If you live in an area prone to severe hail, the Class 4 rating gives you confidence and documentation to show your insurer.

The Guardian lifetime limited warranty covers the original owner for the life of the roof—no prorating, no degradation of coverage. It protects against rusting, rotting, splitting, cracking, curling, and loss of impact resistance. When you sell, the warranty transfers once to the next owner for 50 years from completion, adding real value to your home's sale. That's exceptional because most asphalt shingles are warranted 20–25 years, and you'll replace them at least once during your ownership. With Interlock panels installed in 1998 still in service across North America, and rated to handle Westmont's 993 mm annual rainfall and 82 freeze-thaw cycles per year, you're buying the last roof you'll ever need.

No structural reinforcement is needed—that's the aluminum advantage. The Slate profile installs at 0.41 lb per square foot, and the Mediterranean Tile (which looks like real clay or concrete tile) weighs only about 0.59 lb per square foot and is roughly 96% lighter than actual clay or concrete tile. Most existing roofs can support that weight without any bracing or structural work. In fact, you can install Interlock panels directly over your existing asphalt shingles if they're in decent shape, which saves time and disposal costs. Westmont building code, enforced under ICC-ES ESR-1790, allows this installation method. You get the look of a heavy, high-end roof without the engineering cost.

Metal roofing costs more upfront than asphalt but is cheaper over time because it lasts far longer and needs almost no maintenance. You'll replace asphalt shingles at least twice in 40–50 years; with Interlock panels and the lifetime limited warranty, you won't replace them once. Factor in the cost of two or three asphalt tear-offs, disposal, and reinstallation—plus labor and materials inflation over decades—and metal roofing comes out ahead. The transferable 50-year warranty for the next owner also adds resale value. In Westmont's climate, where about 73 cm of snow, 993 mm of rain, and 82 freeze-thaw cycles per year stress roofing materials, you're avoiding the risk of premature failure and expensive emergency repairs that asphalt is prone to.

Almost none. Asphalt shingles require annual inspections, gutter cleaning after storms, and repairs starting around year 15. Wood shake needs sealing every few years, is vulnerable to rot and insect damage, and deteriorates visibly. Interlock metal roofing has no shingles to curl or come loose, no wood to split or rot, and no coating that fails. Rain just runs off—no standing water, no moss growth, no buildup. The Alunar 70% PVDF finish protects both sides of the panel for 30 years against fading and chalking. With about 3,051 sunshine hours per year in DuPage County and regular rainfall around 993 mm annually, the roof cleans itself and stays protected. You're buying a roof that becomes invisible—it just works.

Interlock Metal Roofing has been serving this region since 2001—that's over two decades of Westmont and DuPage County installations. The company manufactures the panels in Delta, BC, and they're shipped ready to install. Installation timeline depends on roof size and complexity, but most residential projects are complete in 3–5 days. Since the panels can go directly over existing asphalt without removal, you avoid weeks of tear-off work and disposal. The installer inspects your existing deck, confirms it's sound (especially important in a climate with 82 freeze-thaw days per year), and installs the Interlock system to ICC-ES ESR-1790 spec. You get a local contractor who knows the code, your climate, and the product inside and out.

Yes. Westmont averages about 73 cm of snow, 993 mm of rain, roughly 82 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.