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

Metal roofs shed snow and ice far more effectively than asphalt because aluminum's smooth, hard surface resists adhesion—ice doesn't bond the way it does to shingle granules. Davison receives about 87 cm of snow annually, and the four-way interlocking panels are designed to move snow downward without trapping it in valleys like traditional roofs do. The lightweight aluminum (Shake profile at just 0.58 lb/sq ft) also means your structure won't bear the extra load of ice accumulation. You can add snow guards if you want controlled shedding, but many homeowners find the natural slide-off eliminates ice dam problems entirely during the area's typical 86 freeze-thaw cycles per year.

No—aluminum's resistance to freeze-thaw damage is one of its core strengths. Unlike wood that cracks or asphalt that fractures, roofing-grade 3105-H24 aluminum alloy expands and contracts smoothly without splitting or curling. Davison experiences roughly 86 freeze-thaw days annually with mean temperatures around 9.8°C, creating constant expansion stress on traditional materials. Aluminum's oxide layer also self-heals when scratched, so micro-damage from ice movement doesn't initiate corrosion chains like it does on steel. The Alunar 70% PVDF fluorocarbon finish (warranted 30 years) seals the surface, meaning neither salt air from coastal weather systems nor the repeated wet-dry cycles of a 821 mm rainfall year will compromise the material's integrity.

Aluminum cannot rust because it contains no iron—the element that oxidizes into rust. Instead, aluminum develops a transparent oxide layer that actually protects the metal underneath, and when that layer is scratched, it self-heals. This is why Interlock panels have been installed successfully from coastal salt-air homes to Antarctic research stations since 1998. The Alunar 70% PVDF fluorocarbon finish applied to both sides of each panel adds a second protective barrier, which is especially valuable in wet climates like Davison that average 821 mm of rain yearly. Even if the coating were somehow compromised, the aluminum substrate itself cannot corrode the way steel or galvanized roofs do when exposed to moisture and freeze-thaw cycling.

Yes—the four-way interlocking design locks panels together on all sides, creating a unified system that resists panel lift and edge flutter. Interlock metal roofing is warranted to resist wind speeds up to 120 mph when installed to specification, and Davison's typical wind gusts reach about 107 km/h (66 mph), with rare extremes considerably below the warranty threshold. The UL 2218 Class 4 impact rating (the highest available) actually measures wind-driven debris as well as hail impact, so the system has proven performance in severe weather. Unlike asphalt shingles that can peel or curl in gusts, or standing-seam roofs that depend on fasteners, the interlocking geometry distributes wind load across the entire roof plane, making flutter and blow-off virtually impossible when fastened correctly.

No structural reinforcement is needed—in fact, aluminum's feather-light weight is one of its major advantages. The Slate profile installs at just 0.41 lb/sq ft, and even the heaviest option, the Mediterranean Tile, weighs only 0.59 lb/sq ft—roughly 96% lighter than traditional concrete or clay tile. Most existing roofs can support an Interlock metal roof directly over the current shingles, which also adds an extra insulation layer. Davison receives about 87 cm of snow per year, but because the metal roof sheds snow naturally and weighs so little, there's virtually no accumulation load concern. This is why installation costs far less than tearing off and replacing heavy tile, and why homeowners can often avoid the expense and disruption of structural upgrades entirely.

Yes, if you choose an energy-efficient color—these reflect rather than absorb the sun's heat, lowering roof surface temperatures and reducing heat transfer into your home. Interlock's rated colors achieve solar reflectance up to 0.55 (Aged Copper Penny) and thermal emissivity of 0.84, meaning they reflect the infrared radiation that asphalt shingles absorb and convert to heat. Davison receives about 2950 sunshine hours per year, so even in the Pacific Northwest's moderate climate, solar gain through the roof adds cooling load during warmer months. The Cool Roof Rating Council ratings on qualified colors document this performance, and homeowners often see measurable reductions in air-conditioning energy use. Unlike dark asphalt, which radiates that absorbed heat back into the attic, a reflective metal roof keeps heat where it belongs—outside.

Interlock metal roofing carries a UL 2218 Class 4 impact rating—the highest available—and the warranty even covers perforation from hailstones up to 1.5 inches. Class 4 performance means the roof can sustain repeated impacts from 2-inch steel balls dropped from 20 feet without loss of impact resistance, so typical hail is handled easily. Many insurance companies recognize this superior rating and offer discounts on homeowners policies for Class 4 roofing, since the risk of weather-related claims drops dramatically. Although Davison's climate data doesn't flag severe hail as frequent, the long-term durability against any ice or debris impact—whether from storms, falling branches, or ladders—builds confidence that your roof will still be intact after decades. It's worth asking your agent if an upgrade to Class 4 qualifies you for a credit.

Far less than asphalt, wood, or tile. Metal roofing requires no granule replacement, no wood treatment, no tile regrouting, and no algae or moss removal like you'd do on other materials in a wet climate averaging 821 mm of rain per year. Occasional gutter cleaning and a simple rinse to remove dirt are all that's needed. The four-way interlocking panels shed debris naturally; there's no nesting or water pooling in valleys. The Alunar 70% PVDF fluorocarbon finish is CALGreen-verified for reduced maintenance and warranted 30 years against chalking and fading, so you're not repainting or recoating. After 87 cm of annual snow and 86 freeze-thaw cycles, asphalt roofs often show granule loss and cracking by year 15; an Interlock roof looks unchanged because aluminum doesn't crack, curl, or lose surface integrity with temperature cycling.

The Guardian Warranty provides a lifetime limited, non-prorated material warranty to the original owner—covering rusting, rotting, splitting, cracking, curling, and loss of impact resistance. It's transferable once, giving the next owner 50 years from completion, which is valuable for resale. Interlock has manufactured aluminum roofing since 1998 in Delta, BC, with installations ranging from coastal salt-air homes to Antarctic research stations, demonstrating performance across extreme climates far harsher than Davison's 9.8°C average and 107 km/h wind gusts. The 30-year coating warranty (ASTM D4214/D2244 tested) protects against chalk and fade, but the underlying aluminum's durability extends far beyond that. Unlike asphalt (15-20 year life) or composition shingles that degrade with freeze-thaw cycling, aluminum doesn't degrade—it's truly the last roof you'll buy.

Interlock Metal Roofing (PNW) Inc. has served this region since 1997 and is your local installer for all five Interlock profiles—Slate, Cedar Shingle, Shake, Mediterranean Tile, and Standing Seam. They understand Davison's specific conditions: the 821 mm annual rainfall, 87 cm snowfall, 86 freeze-thaw days, and typical gusts to 107 km/h. As a regional specialist for over 25 years, they've installed hundreds of roofs in Lewis County and know the structural particularities of local homes, local codes (ICC-ES ESR-1790 compliant), and the best approach for installing over existing roofs. Currently, they're offering no payments and no interest until Spring 2027 or 10% off installation, making this an ideal time to get a local assessment. Call them directly for a free inspection and estimate—they can walk you through the process and timeline for your specific home.

Yes. Davison averages about 87 cm of snow, 821 mm of rain, roughly 86 freeze–thaw days a year, with peak wind gusts near 107 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.