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

Yes—aluminum's crystalline structure and flexibility make it inherently resistant to the damage that freeze-thaw cycling causes to brittle materials. Frankfort experiences approximately 81 freeze-thaw days per year, a threshold where lesser roofing materials crack, curl, or split. Interlock's 3105-H24 aluminum alloy flexes without fracture; the Alunar coating (warranted 30 years against chalking and fading per ASTM D4214) remains intact through these cycles. The metal itself contains no iron and cannot rust, so winter moisture exposure—combined with your region's ~1102 mm annual rainfall—does not trigger corrosion. This durability is why Interlock panels have been installed since 1998 in climates far harsher than Will County.

Metal's slippery surface sheds snow and ice more readily than asphalt, reducing ice-dam formation and the weight burden on your structure. Interlock's four-way interlocking aluminum panels are engineered to handle full snow loads; the system's design prevents infiltration even when melt-and-refreeze cycles occur during Frankfort's approximately 81 freeze-thaw days yearly. The panels themselves are extraordinarily light—the Cedar Shingle profile weighs just 0.41 lb/sq ft, allowing installation over most existing roofs without structural reinforcement. Snow guards can be added if desired. Combined with a solid deck and underlayment, this creates a weather barrier that outperforms asphalt in heavy-snow regions.

Interlock's four-way interlocking panel design and metal-to-metal seams are inherently leak-resistant, shedding Frankfort's ~1102 mm annual rainfall away from the structure. Unlike asphalt shingles, which degrade from repeated wetting, metal panels have no granules to wash away or sealants to fail. When installed to spec over a solid deck with appropriate underlayment, the overlapping geometry of the panels—whether Slate, Cedar Shingle, Shake, or Tile profile—directs water downslope; the ESR-1790 ICC evaluation confirms compliance with IBC/IRC water penetration standards. Metal roofs do not leak when properly installed; many homeowners report zero water intrusion over decades, even in regions with heavier rainfall than Frankfort's annual average.

Interlock metal roofing is warranted to resist wind speeds up to 120 mph when installed to specification—well above Frankfort's typical daily-max winds of approximately 20 km/h and recorded gusts near 102 km/h. The four-way interlocking panel design locks each piece to its neighbors on all four sides, distributing wind loads evenly across the system rather than concentrating stress on fasteners. This mechanical interlock also achieves UL 2218 Class 4 impact resistance (the highest available) and qualifies for the Guardian Warranty's hail coverage up to 1.5 inches. For a region where spring and fall gusts can approach 100 km/h, this redundancy means your roof will not lift, flutter, or fail where asphalt or single-lock systems might.

Interlock aluminum roofing carries a UL 2218 Class 4 impact rating—the industry's highest—and the Guardian Warranty covers perforation from hailstones up to 1.5 inches. In typical Frankfort spring and summer storms, this rating provides exceptional protection. Aluminum's light weight and flexibility mean impact energy is absorbed rather than transmitted to the structure below. Many insurers recognize UL 2218 Class 4 certification and offer premium discounts because claims frequency is demonstrably lower; contact your agent with the ESR-1790 ICC evaluation and UL listing 33876 for your policy review. Unlike asphalt, which requires costly replacement after severe hail, metal roofing often needs no repair at all or only cosmetic touch-up.

Aluminum contains no iron, the element that oxidizes and corrodes in the presence of oxygen and moisture. Instead, aluminum immediately forms a microscopically thin, self-healing oxide layer when exposed to air—a natural barrier that regenerates if scratched. Frankfort's ~1102 mm annual rainfall and freeze-thaw cycling place constant moisture stress on roofing; steel requires protective coatings and fastener sealants that degrade over time, but aluminum's oxide layer requires no maintenance to function. Interlock adds a Alunar 70% PVDF fluorocarbon finish (applied to both sides, warranted 30 years) for added durability and aesthetic retention. This two-layer protection strategy—inherent non-corrosion plus premium coating—is why Interlock panels have been installed in coastal salt-air environments and an Antarctic research station without rusting.

No structural reinforcement is needed. Interlock's Mediterranean Tile profile, which replicates the appearance of concrete or clay tile, weighs approximately 0.59 lb/sq ft—about 96% lighter than traditional tile. Even the heavier Shake profile is just 0.58 lb/sq ft. Your home already supports the weight of snow (Frankfort averages ~70 cm per year) plus ice and wind loads; metal roofing adds less weight than the asphalt shingles currently on your roof or the snow accumulation in January. This extraordinary lightness allows Interlock panels to install directly over most existing roofs without adding structural burden, reducing labor costs and waste. The ESR-1790 evaluation confirms installation compatibility with standard residential framing.

Interlock's 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—conditions that routinely end the life of asphalt roofs within 15–20 years. The warranty is one-time transferable, giving the next owner 50 years from completion, a strong selling point if you move. The Alunar coating carries a separate 30-year warranty against chalking and fading (ASTM D4214/D2244 measured), meaning your roof's color and reflectivity remain stable across Frankfort's ~3056 annual sunshine hours and freeze-thaw cycling. Because aluminum does not rust and the interlocking panels do not split or curl, the primary failure mode—material degradation—is eliminated, not merely delayed.

Metal roofing requires virtually no routine maintenance. Unlike asphalt shingles, which lose granules in Frankfort's ~1102 mm annual rainfall and must be replaced every 15–20 years, Interlock panels do not degrade from weathering or UV exposure. Unlike clay or concrete tile, which crack in freeze-thaw cycling (you experience ~81 freeze-thaw days yearly), metal does not split or develop stress fractures. The Alunar coating is warranted 30 years against color fade and chalk, so repainting is not necessary. Occasional gutter cleaning and debris removal are standard for any roof, but metal roofing eliminates the cycle of granule loss, sealant reapplication, and early replacement that makes asphalt costly over time. CALGreen verification confirms Interlock metal roofing's reduced maintenance profile.

Upfront cost is higher than asphalt, but total lifetime cost is dramatically lower. Asphalt roofs cost $8,000–$12,000 to install and must be replaced twice in 40 years—three cycles, ~$24,000–$36,000 in labor, material, and disposal, plus the environmental cost of ~9 tons of asphalt per 1,000 sq ft to landfill. Interlock metal roofing, installed once, lasts a lifetime under the Guardian Warranty (transferable, covering 50 years for the next owner) with no replacement or tear-off cycle. The Alunar 70% PVDF coating is warranted 30 years against fading, eliminating expensive repainting. For a 40-year horizon, metal's single installation, zero replacement cost, and energy savings (energy-efficiency colors with 0.84 emissivity reduce cooling loads in summer) make it the last roof you will buy—a financial advantage that compounds with time and transfers value to future owners.

Yes. Frankfort averages about 70 cm of snow, 1102 mm of rain, roughly 81 freeze–thaw days a year, with peak wind gusts near 102 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.