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

Interlock's four-way interlocking aluminum panels shed snow and ice reliably in McHenry County's average 84 cm of annual snowfall. The smooth, hard surface prevents ice dam formation better than asphalt, which traps moisture and freezes. Optional snow guards can be installed if you want to control shedding on specific areas. The lightweight profile—Shingle at just 0.41 lb/sq ft—never requires the structural reinforcement that slate or concrete tile demands, so there's zero hidden cost to handle the load.

No. Aluminum's oxide layer actually strengthens during freeze-thaw cycling rather than degrading like asphalt or wood shakes. Harvard experiences roughly 83 freeze-thaw days annually, which would crack and curl traditional roofing—but aluminum's molecular structure and Alunar 70% PVDF coating (warranted 30 years) withstand thousands of these cycles without loss of integrity. The metal expands and contracts uniformly, and because it contains no iron, it cannot rust even when salt-laden groundwater splashes during thaw periods.

Yes. Interlock panels are warranted to resist wind speeds up to 120 mph when installed to specification—well above the typical McHenry County gust speeds of 100 km/h (62 mph). The four-way interlocking system locks each panel to its neighbors horizontally and vertically, creating a unified assembly that distributes wind load across the entire roof rather than stressing individual fasteners. That same engineering is why the system earns an ICC-ES ESR-1790 evaluation for building code compliance across IBC and IRC standards.

Aluminum cannot rust because it contains no iron—the element that oxidizes and fails. Instead, aluminum forms a self-healing oxide layer that actually protects the metal underneath. In Harvard's 838 mm of annual rainfall and occasional salt-air exposure (if near roads treated in winter), this passive protection is genuinely maintenance-free. The Alunar 70% PVDF fluorocarbon coating applied to both sides adds a second barrier, warranted 30 years against chalking and fading. Even if scratched, the oxide layer regenerates automatically.

Yes, when you measure total cost over the roof's life. Asphalt requires replacement every 15–20 years; Interlock's lifetime limited warranty covers the original owner and transfers once (50 years from completion) to the next owner. In Harvard's 3084 annual sunshine hours and 838 mm rain, asphalt deteriorates faster than in calmer climates. You avoid multiple tear-offs and landfill fees. Your energy bills drop with energy-efficiency-certified reflective colors. Insurance may offer hail discounts (UL 2218 Class 4 rating). The final cost per year is lower.

Absolutely. Interlock's energy-efficient colors have thermal emissivity up to 0.84 and solar reflectance up to 0.55 (Aged Copper Penny profile), meaning they reflect the heat that asphalt absorbs. In a climate averaging 3084 sunshine hours yearly, that reflection compounds month after month. The Cool Roof Rating Council rating confirms measurable cooling savings. Asphalt roofs absorb solar energy and radiate it downward into your attic; a reflective metal roof keeps that heat outside. You won't notice it on a mild day, but summer air-conditioning bills reveal the difference.

The Guardian lifetime limited warranty covers the original owner against rusting, rotting, splitting, cracking, curling, and loss of impact resistance—no prorated reduction. It transfers one time to the next owner, who receives 50 years of coverage from the roof's completion date. This non-prorated structure means you're protected for decades without watching your coverage shrink each year. Compare that to typical asphalt warranties (15–25 years, prorated after year 5 or 10), and you see why Interlock has been manufactured continuously since 1998 in Delta, BC.

Yes on both counts. Interlock achieves UL 2218 Class 4—the highest impact rating available—and the warranty even covers perforation from hailstones up to 1.5 inches. Many insurers recognize that aluminum's hardness and interlocking design resist hail better than asphalt, and some offer premium discounts. In Illinois, where spring and summer hail occurs, that rating translates to real protection and potential savings. Over 20+ years, those policy reductions plus avoided deductibles add up; you're not exposed to the recurring hail claims that force asphalt replacement.

Installation typically takes 2–5 days depending on roof size and complexity, performed by Interlock's local team serving the region since 2001. Yes, the lightweight profile can install directly over most existing roofs—no tearoff required. The Tile profile, for example, weighs just 0.59 lb/sq ft (about 96% lighter than concrete or clay tile), so no structural reinforcement is needed. The installation crew removes only the old flashing and ridge caps, installs an underlayment, and secures the new panels with hidden fasteners. You avoid dumpster fees and weeks of debris.

Yes. Aluminum is roughly 95% recyclable; at end of life, your roof goes to a recycling facility, not a landfill. Asphalt shingles, by contrast, are rarely recycled and fill landfills by the millions of tons yearly. Interlock stops that cycle immediately. Aluminum's durability means fewer replacements over a century, so fewer roofing materials extracted and manufactured. The Alunar coating is PVDF (same chemistry used in industrial applications for 50+ years), and the panels earn CALGreen verification for reduced maintenance impact. Over the lifetime of your home, the environmental footprint is substantially lower.

Yes. Harvard averages about 84 cm of snow, 838 mm of rain, roughly 83 freeze–thaw days a year, with peak wind gusts near 100 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.