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

Yes. Aluminum expands and contracts with temperature swings, but its oxide layer doesn't crack or become brittle like asphalt or wood. With about 82 freeze-thaw cycles per year in Cook County, that flexibility matters. The 3105-H24 aluminum alloy won't split, curl, or rot—conditions that destroy traditional roofing after 15-20 winters. The Alunar coating stays intact through those cycles too, backed by a 30-year fade warranty measured to ASTM D4214 standards.

Metal roofing sheds snow and ice far better than asphalt because the smooth panels don't absorb heat—they reflect it. With roughly 73 cm of annual snowfall here, that matters. The four-way interlocking system creates a unified membrane, so water runs off cleanly rather than pooling and refreezing into ice dams. The lightweight design—about 0.41 lb/sq ft for the Shingle profile—means no structural upgrade needed, and optional snow guards can be added if you want to manage shedding.

The four-way interlocking panels are warranted to resist wind speeds up to 120 mph. Harwood Heights experiences typical gusts around 97 km/h (about 60 mph), with occasional stronger storms, so the system handles local conditions with a significant safety margin. The mechanical interlock—not adhesive or fasteners alone—locks each panel to its neighbors, distributing wind load across the whole roof plane. That's why the product carries a formal 120 mph wind warranty and ICC-ES ESR-1790 code approval for the region.

No—Interlock metal roofing holds a UL 2218 Class 4 impact rating, the highest available, and the warranty even covers perforation from hailstones up to 1.5 inches. Aluminum's toughness combined with its light weight and non-combustibility (Class A fire rating available) has led some insurers to offer discounts on homes with this roofing. It's worth asking your agent; many carriers recognize that metal roofing eliminates the wind, hail, and fire claims that drive up premiums in Cook County.

Aluminum cannot rust because it contains no iron. When scratched, the aluminum oxide layer self-heals in minutes—a natural protection that repairs itself without paint or coatings. That's a fundamental material advantage for Harwood Heights, where about 993 mm of rain falls annually. Steel roofing, by contrast, begins rusting within days of a scratch and requires constant maintenance. The Alunar 70% PVDF fluorocarbon finish (applied to both sides) adds another 30-year durability layer, but the base metal itself is immune to rust.

The four-way interlocking system creates a tight mechanical seal between panels—water cannot penetrate the joints. With nearly 1000 mm of annual rainfall in Harwood Heights, that overlap design is critical. The panels shed water faster than asphalt because the smooth surface doesn't absorb moisture, and the interlock geometry directs it down the roof plane. When installed over a solid deck with underlayment (standard practice), leaks are virtually eliminated. The Guardian warranty covers water penetration for the life of the original owner.

No reinforcement needed. The Mediterranean Tile profile installs at about 0.59 lb/sq ft—roughly 96% lighter than concrete or clay tile. Even the heavier Shake profile weighs only 0.58 lb/sq ft. Most homes in Cook County built to modern code can handle this load without modification. In fact, Interlock installs over existing asphalt roofs routinely, which saves the tear-off cost and landfill impact. Lightweight design is one reason the product has been deployed from coastal homes to Antarctica since 1998.

The Guardian warranty is lifetime limited and non-prorated for the original owner—covering rusting, rotting, splitting, cracking, curling, and loss of impact resistance with no depreciation clause. It's also one-time transferable, giving the next owner 50 years of coverage from completion. In Harwood Heights' 82 annual freeze-thaw cycles, that protection eliminates the five-year-to-fifteen-year lifespan cycle of asphalt. You're looking at a roof that outlasts the mortgage and two ownership cycles, backed in writing from day one.

Aluminum is about 95% recyclable, and Interlock roofing can be reclaimed and reprocessed at end of life instead of landfilled like asphalt shingles. When you install over an existing roof (which the lightweight design allows), you eliminate the tear-off waste that's typical in Harwood Heights home renovations. The product is CALGreen-verified for reduced maintenance requirements too. Over a 50-year lifespan, one metal roof replaces five or six asphalt roofs, each producing tons of waste and requiring extraction of fresh materials.

Yes. Interlock Metal Roofing has been serving this region since 2001 and is the local installer for Harwood Heights and Cook County. That means faster response times, familiarity with local building codes (ESR-1790 compliance), and knowledge of how the product performs in our specific climate—about 3051 sunshine hours annually, variable wind gusts up to 97 km/h, and heavy winter snow. Working with the manufacturer's regional team also ensures proper installation to wind and load specifications and direct access to warranty support.

Yes. Harwood Heights 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.