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

Aluminum won't crack, split, or curl during freeze-thaw cycling because it has no wood fiber or moisture absorption — the material simply cannot rot or freeze-fail. Mattawa experiences about 72 freeze-thaw days per year, which would stress asphalt shingles and wood shakes relentlessly. The 3105-H24 aluminum alloy used in Interlock panels is engineered to expand and contract uniformly without material degradation. The Alunar 70% PVDF coating warranty covers 30 years against cracking and chalking under these exact conditions.

Aluminum cannot rust because it contains no iron — the chemical element that oxidizes into rust. Instead, aluminum forms a self-healing oxide layer that actually protects the metal underneath; if that layer is scratched, a new one forms automatically. Steel roofing, by contrast, rusts aggressively once the protective coating is breached. Since Mattawa receives about 222 mm of rain annually, a non-rusting material eliminates the corrosion risk that steel homeowners face year-round. Interlock's 3105-H24 aluminum alloy is the industry standard for roofing precisely because of this property.

Interlock manufactures five profiles — Slate, Cedar Shingle, Shake, Standing Seam, and Mediterranean Tile — each replicating traditional materials in durable aluminum. Your choice depends on your home's architecture and personal preference. Slate suits modern or contemporary designs; Cedar Shingle and Shake mimic rustic or cottage character; Mediterranean Tile works for Spanish, Tuscan, or Southwestern styles; Standing Seam delivers clean, industrial lines. All profiles carry the same 30-year coating warranty and the lifetime limited Guardian Warranty, so durability doesn't vary by style. Our local installer can help you visualize options and assess which profile complements your home's existing character.

Metal roofing naturally sheds snow and ice more effectively than asphalt because the smooth surface and thermal conductivity reduce ice-dam formation. Mattawa averages about 30 cm of snow annually, along with roughly 72 freeze-thaw days, creating repeated ice-thaw cycles that strain conventional roofs. Interlock's interlocking panels create a unified surface that moves as one, and the warranty covers resistance to wind speeds up to 120 mph — easily protecting against winter wind gusts typical of the region, which average around 15 km/h with peaks to 84 km/h. Snow guards can be added if you prefer to retain snow for insulation or aesthetic reasons.

No reinforcement needed. Interlock's aluminum panels are extraordinarily light — the Mediterranean Tile profile, for example, weighs just 0.59 lb/sq ft, making it roughly 96% lighter than concrete or clay tile. This lightness means no structural modifications, no building permits for load capacity, and the ability to install directly over your existing asphalt shingles. Mattawa homeowners benefit immediately: faster installation, lower labor costs, and zero worry about exceeding roof-load limits. The Guardian Warranty applies whether you install over an existing roof or bare sheathing, so your protection is the same either way.

Interlock roofing carries the UL 2218 Class 4 impact rating — the highest available — and the warranty even covers perforation from hailstones up to 1.5 inches. This exceptional durability often qualifies homeowners for homeowners' insurance discounts, sometimes 10–15% depending on your carrier. Since Mattawa sits in a hail-prone region where wind gusts exceed 80 km/h, Class 4 impact resistance provides tangible peace of mind. Contact your insurer with the UL 2218 Class 4 documentation to inquire about discounts before installation; combined with the 30-year coating warranty and lifetime material coverage, you're protected both by your roof and potentially by lower annual premiums.

Interlock aluminum requires minimal maintenance — essentially just annual gutter cleaning, which you'd do anyway. There's no shingle replacement, no moss/algae treatment, no caulking of seams, and no fear of leaks from split wood or curled asphalt. Asphalt shingles deteriorate under Mattawa's 3524 annual sunshine hours and 72 freeze-thaw cycles, requiring partial replacement every 10–15 years; wood shakes rot in wet climates and need constant re-sealing. Aluminum won't split, rot, or lose structural integrity. The Alunar 70% PVDF coating is CALGreen-verified for reduced maintenance burden, and the 30-year coating warranty guarantees no chalking or fading performance decline.

The Guardian Warranty is a lifetime limited, non-prorated material warranty for you as the original owner — covering rusting, rotting, splitting, cracking, curling, and loss of impact resistance. One-time transferable to the next owner, who receives 50 years of coverage from completion. This means your roof is protected for your entire ownership, and when you sell, you pass along four decades of additional protection to the buyer. Combined with the 30-year coating warranty and the aluminum's inherent resistance to the 72 annual freeze-thaw cycles Mattawa experiences, your roof won't require replacement during your lifetime. Over 25+ years, that's the last roof you'll ever install.

Yes. Interlock's energy-efficient colors deliver thermal emissivity up to 0.84 and solar reflectance up to 0.55, meaning they reflect heat that dark asphalt absorbs, keeping your attic and home cooler. In Mattawa's 3524 annual sunshine hours, this reflectivity reduces air-conditioning load and lowers summer energy bills. The Cool Roof Rating Council rating confirms performance independently. While Mattawa's climate is temperate, the 13.3°C mean annual temperature means you still benefit from reduced summer cooling costs. Lighter-colored profiles like Aged Copper Penny or pale finishes maximize these gains, and the energy savings compound over the roof's 25+ year lifespan.

Interlock Metal Roofing (PNW) Inc. has served the Mattawa and Grant County region since 1997 — nearly three decades of local installation expertise. The company knows the region's wind patterns (gusts to 84 km/h), freeze-thaw cycles (about 72 per year), and seasonal timing. They're familiar with Mattawa's building codes, permitting, and the specific profiles that suit local homes. Currently, the installer offers either no payments and no interest until Spring 2027 or 10% off metal roof installation, reducing upfront costs. Working with a local, experienced installer ensures your roof meets ICC-ES ESR-1790 specifications and that the Guardian Warranty is installed correctly from day one.