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

Yes. Aluminum expands and contracts with temperature swings, but it does so uniformly—and the four-way interlocking panels accommodate that movement without cracking or curling. Palos Hills experiences about 81 freeze-thaw days per year, which is exactly the kind of stress that degrades asphalt and wood shingles. Aluminum oxide forms a self-healing protective layer that strengthens with age rather than weakening, so repeated freezing and thawing actually don't degrade the material. The Alunar 70% PVDF coating is warranted for 30 years against the surface damage freeze-thaw typically causes.

Metal roofing sheds snow and ice more effectively than asphalt because the smooth, slippery surface doesn't trap moisture the way porous shingles do. Palos Hills receives about 70 centimeters of snow annually, and ice dams form when heat loss and poor drainage create the conditions for refreezing. Because aluminum doesn't absorb heat the way asphalt does, and because the panels are designed with proper slope, snow slides off before it compacts into ice. The roof's extraordinarily light weight—Shake profile at 0.58 lb/sq ft—means your structure handles the temporary snow load without strain, and melting snow drains properly rather than pooling.

Palos Hills sees typical gusts around 102 km/h, and Interlock's four-way interlocking panels are engineered to resist wind speeds up to 120 mph when installed to specification. That's a real safety margin. The panels lock together on all four edges, so wind doesn't have leverage to lift or separate them—it can't find a seam to exploit. Every panel is mechanically fastened to the deck, and the interlocking design means if one panel is compromised (which is rare), the others remain secure. UL 2218 Class 4 impact ratings and a 120 mph wind warranty give you confidence through spring severe weather and winter nor'easters alike.

Aluminum cannot rust because it contains no iron—rust only forms when iron oxidizes. Instead, aluminum develops a microscopic oxide layer that actually protects the underlying metal, and this layer self-heals when scratched or exposed. This matters in Illinois because our 1102 mm of annual rainfall and freeze-thaw cycling create environments where steel roofs rust through within 15 to 20 years. The Alunar coating on both sides of every panel adds another 30-year barrier against corrosion. So while steel requires paint maintenance and eventual replacement, aluminum's chemistry simply doesn't allow rust to form—ever.

No. Palos Hills receives about 1102 mm of rain annually, and metal roofing actually outperforms asphalt in heavy rainfall because water runs off immediately rather than being absorbed into the shingle material. The four-way interlocking panels overlap continuously, creating a solid rain barrier. Installed over a solid deck with proper underlayment, the roof becomes a complete system—flashing at valleys, eaves, and penetrations is designed to channel water away from the structure. The ICC-ES evaluation ESR-1790 confirms this design meets IBC/IRC code for water management. Metal's smooth surface doesn't degrade or become porous over time the way asphalt does, so leak resistance actually improves with age.

Many insurers do offer discounts for UL 2218 Class 4 impact-rated roofing, which is the highest impact rating available. Interlock's aluminum roofing carries that rating, and the Guardian warranty even covers perforation from hailstones up to 1.5 inches. You should contact your insurance agent with the UL 2218 Class 4 specification and ESR-1790 documentation—both of which demonstrate your roof can withstand severe impact events. Illinois hail can be destructive, and this documentation often qualifies you for a premium reduction that offsets part of the installation cost over just a few years. It's worth asking your agent specifically.

Virtually none compared to asphalt, wood, or tile. Metal roofing doesn't require resealing, repainting, or annual inspection to catch curling or splitting shingles. In Palos Hills' climate, with about 1102 mm of rain yearly and 81 freeze-thaw days, asphalt shingles deteriorate visibly within 15 years, but aluminum panels continue to perform without active maintenance. The Alunar 70% PVDF coating is warranted for 30 years against chalking and fading, so even the finish resists the UV exposure and weather cycling that makes asphalt brittle. Debris like leaves should be cleared from valleys as you would with any roof, but that's it—no gutter-level repairs, no seasonal sealing.

When you compare the total cost of ownership over 30 to 50 years, metal roofing typically costs less than replacing asphalt shingles twice. Asphalt roofs last 15 to 20 years in Palos Hills' freeze-thaw environment (about 81 days per year), requiring two or three replacements before metal would need any. The Guardian warranty is lifetime limited and non-prorated for the original owner, then transfers to the next owner for 50 years—meaning you buy one roof instead of multiple shingle replacements and the associated labor, debris removal, and disposal. Factor in that metal sheds snow and ice more safely, potentially reducing insurance premiums, and the financial case becomes clear: it's the last roof you'll install.

The Guardian Warranty covers rusting, rotting, splitting, cracking, curling, and loss of impact resistance for the original owner's entire ownership of the home—that's lifetime, no prorating. The material warranty transfers once to the next owner for 50 years from completion, which significantly enhances resale value. The Alunar coating carries a separate 30-year warranty against chalking and fading. Because aluminum cannot rust (no iron in the alloy), because it won't rot, and because the four-way interlocking design eliminates splitting and stress-fracture points, the warranty's scope tells you something important: these claims almost never need to be filed. The warranty exists, but it's backed by material science and engineering that make failure extremely rare.

No reinforcement is needed. The Interlock Tile profile, which replicates the look of heavy clay or concrete tile, weighs about 0.59 lb/sq ft—roughly 96% lighter than the real thing. This means you can install it over most existing roofs without adding structural load, which saves thousands in framing upgrades. Palos Hills gets about 70 cm of snow annually, creating temporary load conditions that your home's existing structure was already designed to handle. Metal's lightweight nature actually protects your home by reducing dead load on rafters, walls, and foundations throughout its 50+ year lifespan. This is one reason ICC-ES ESR-1790 approves installation over existing assemblies: the engineering accounts for your home's actual capacity.