Metal Roofing in New London, Washington — Lifetime Interlock® Aluminum Shingles Installed Locally

Metal roofs shed snow and ice far more effectively than asphalt because the smooth, hard surface prevents moisture from bonding. New London averages about 120 cm of snow annually and roughly 38 freeze-thaw days per year, which means your roof cycles between wet and frozen repeatedly. Interlock's four-way interlocking panels handle that expansion and contraction without the cracking, curling, or granule loss that asphalt shingles suffer. The aluminum won't absorb water, so ice dams are less likely to form and trap moisture underneath. We typically install snow guards on steeper pitches to manage shedding safely.

Aluminum cannot rust because it contains no iron. Instead, it forms a self-healing oxide layer when exposed to air—even if scratched, the metal naturally repairs itself. That matters enormously in Grays Harbor County, where you're getting about 2305 mm of annual rainfall and coastal-influenced moisture. Steel roofs corrode from the inside out in humid climates; aluminum roofing-grade 3105-H24 aluminum alloy stays structurally sound indefinitely. We also coat both sides of every Interlock panel with Alunar 70% PVDF fluorocarbon finish, warranted 30 years against chalking and fading. In a wet climate like yours, that dual-sided protection means your roof will look and perform like new for decades.

Yes. Interlock panels are warranted to resist wind speeds up to 120 mph, and our local gusts can reach about 106 km/h. The four-way interlocking design locks adjacent panels together—when one panel wants to lift, its four edges grip the panels around it, distributing the force across the entire roof rather than focusing stress on fasteners. That engineering is why we warranty wind resistance to 120 mph even in the harshest conditions. The panels are also extraordinarily light (the Slate profile installs at about 0.41 lb per square foot), so there's less mass for wind to grab, and less structural strain from lateral forces. Installers must follow the spec exactly, but a properly secured Interlock roof is proven in hurricane and gale-force environments.

Interlock achieves UL 2218 Class 4 impact rating—the highest available—meaning it survives steel ball strikes from 2 inches high without performance loss. The warranty even covers perforation from hailstones up to 1.5 inches. Hail isn't frequent in Grays Harbor County, but Class 4 rating matters because it proves the roof won't lose impact resistance, crack, or leak from impact. Many insurers offer discounts for Class A fire-rated non-combustible roofing and Class 4 impact resistance, though discounts vary by carrier. Contact your agent with the ICC-ES evaluation report ESR-1790 and the UL 2218 documentation; they'll calculate whether your premium drops enough to offset part of the roof cost over time. That's a direct financial benefit of aluminum's engineered durability.

The Guardian is a lifetime limited, non-prorated material warranty for the original owner—it covers rusting, rotting, splitting, cracking, curling, and loss of impact resistance for as long as you own the home. Because aluminum doesn't rot, rust, or split, that's a practical guarantee. The transferable portion gives the next owner 50 years from completion, which matters if you sell. Interlock has manufactured this product since 1998, with installations ranging from coastal salt-air homes to an Antarctic research station. Real-world track record shows panels lasting 50+ years with no material degradation. Add the 30-year coating warranty on the Alunar finish, and you're looking at a roof that handles New London's 2305 mm of annual rainfall and temperature swings without the gradual failure modes that plague asphalt shingles or wood shake.

Almost certainly not. The Slate profile installs at roughly 0.41 lb per square foot, the Shake at 0.58, and the Mediterranean Tile at 0.59—that last one is about 96% lighter than concrete or clay tile. Most existing roof structures are already overbuilt for those weights. Because Interlock panels install over most existing asphalt roofs without removal, you avoid the decking repairs and reinforcement that slate or real tile would require. We assess your existing structure during a site visit, but in typical New London homes, we're installing directly over the old shingles. You save on decking work, no structural engineer is needed, and the roof will actually reduce the total load on your home compared to what's there now. The lightweight advantage is real savings, not just a convenience.

Calculate the total cost of ownership over 50 years, not the sticker price. Asphalt shingles fail in heavy-rain, freeze-thaw climates like ours—New London averages about 38 freeze-thaw days per year and 120 cm of snow. You'll replace asphalt roughly three times in 50 years, plus emergency repairs, plus labor for multiple removals and disposals. Interlock installed today will outlast two or three asphalt cycles. Right now we're offering no payments and no interest until Spring 2027 or 10% off the installation. Even without financing, compare three asphalt replacements against one Interlock roof. Factor in the energy savings from energy-efficiency colors (up to 0.55 initial solar reflectance on certain profiles), the elimination of maintenance, and the 50-year transferable warranty that adds resale value. Over a half-century, metal is cheaper and far less disruptive.

Aluminum is non-combustible and Interlock offers Class A fire classification—the highest fire rating available. The ICC-ES evaluation report ESR-1790 confirms that rating. Non-combustible roofing qualifies for insurance discounts in many policies and meets CALGreen requirements for reduced-maintenance, fire-resistant design. Fire isn't a frequent threat in New London, but Class A rating means your roof won't contribute fuel to a structure fire and won't spread flames across the surface. Some insurers credit non-combustible roofing on their premium calculations; others use it to qualify you for preferred underwriting. Check with your agent, and provide them the ESR-1790 report. Even if your insurer doesn't offer a discount, you're adding a safety layer that asphalt shingles can't match, and that protection lasts for the life of the roof.

Interlock Metal Roofing (PNW) Inc. has served Grays Harbor County and the broader region since 1997—nearly three decades of installations in our exact climate. They understand New London's 2305 mm of annual rainfall, the about 106 km/h wind gusts, and the freeze-thaw cycles that are brutal on asphalt. The company is the local factory-authorized installer, meaning they've trained directly with Interlock engineers and carry the full Guardian warranty. They assess your existing roof structure, handle permitting, manage the installation timeline, and back their work. When you choose a local, long-established installer, you're not hiring a crew passing through; you're working with people who'll stand behind the roof for decades because they live in the same community. Get a site visit and estimate from Interlock (PNW) Inc.—they'll walk you through options, financing, and the installation process specific to your home.

Yes. Aluminum is roughly 95% recyclable; at end of life (which may be 50+ years away), the panels return to the recycling stream and become new products. Asphalt shingles don't recycle; they tear off every 15–20 years and go to landfills by the truckload. Over 50 years, you'll divert three roofing tearoffs—hundreds of pounds of waste per household—from landfills by installing metal once. Interlock has manufactured from Delta, BC since 1998, minimizing transport distance for western North America. The published solar-reflectance listing on certain color options (with thermal emissivity 0.84 and solar reflectance up to 0.55) reduces summer cooling loads in sunny stretches, lowering your home's energy footprint. CALGreen verification confirms the reduced maintenance benefit—no granule shedding into stormwater, no algae treatments. One roof, installed once, eliminates the environmental cost of repeated asphalt cycles.

Yes. New London averages about 60 cm of snow, 2305 mm of rain, roughly 38 freeze–thaw days a year, with peak wind gusts near 106 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.