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

Metal roofs shed snow efficiently because aluminum's smooth surface and thermal properties prevent ice dams better than asphalt. Curtis receives about 42 cm of snow annually and experiences roughly 45 freeze-thaw days per year—conditions that cause asphalt shingles to curl and crack. Interlock's four-way interlocking panels stay watertight through repeated freezing and thawing, and the lightweight design means no structural reinforcement is needed, even when snow accumulates. Snow guards can be added if you prefer slower shedding for safety.

No—when installed to specification, Interlock metal roofing is completely watertight. Curtis averages 1,348 mm of rainfall annually, and the four-way interlocking panels create a sealed system that directs water down and away. The aluminum alloy (3105-H24 / 3003-H24) and Alunar 70% PVDF coating protect against moisture infiltration, while the solid deck and underlayment eliminate the gaps that plague traditional shingles in heavy rain. Proper installation by Interlock Metal Roofing (PNW) Inc.—serving this region since 1997—ensures every seam performs.

Aluminum cannot rust because it contains no iron. Instead, it develops a protective oxide layer that heals itself when scratched—a natural advantage over steel roofing, which requires constant vigilance in wet climates. Curtis's 1,348 mm of annual rain would spell disaster for ferrous metals, but aluminum's self-healing oxide plus the Alunar 70% PVDF coating (warranted 30 years against corrosion) create a two-layer shield. This combination has proven itself in saltwater environments and Antarctic research stations, so coastal Pacific Northwest moisture poses no risk.

Yes. Interlock's four-way interlocking panels are warranted to resist wind speeds up to 120 mph (193 km/h)—far beyond Curtis's typical gusts, which average 14 km/h with peaks around 102 km/h. The panels lock together, creating a unified system that prevents lift and flutter during storms. This engineering also means no individual panel failure during high winds, unlike asphalt shingles that tear away one at a time. The interlocking design distributes wind loads across the entire roof rather than stressing fasteners at isolated points.

No structural reinforcement is required. Interlock's Mediterranean Tile profile weighs only about 0.59 lb/sq ft—roughly 96% lighter than real tile or concrete—while the Cedar Shingle and Shake profiles are even lighter at 0.41 and 0.58 lb/sq ft respectively. This means the roof can be installed over most existing structures without additional bracing, and it often installs directly over your current roof, eliminating costly tear-off and disposal. For Curtis's 42 cm annual snowfall and 45 freeze-thaw cycles, a lighter load also reduces structural stress over decades.

Aluminum thrives in freeze-thaw environments. The 3105-H24 and 3003-H24 aluminum alloys maintain their integrity through repeated temperature swings because aluminum doesn't expand and contract the way wood, asphalt, or steel does. Curtis's 45 annual freeze-thaw days and temperature fluctuations won't cause splitting, cracking, or curling—problems that plague traditional roofing materials. The Alunar 70% PVDF coating (verified to ASTM D4214 standards) remains flexible and bonds permanently to the aluminum, so it won't peel or separate during thermal cycling.

Interlock carries the highest hail rating available: UL 2218 Class 4 impact resistance, tested against 1.5-inch hailstones. The warranty even covers perforation from hail of that size. This protection may qualify you for insurance discounts—check with your provider. Curtis's climate doesn't typically feature severe hail, but the Class 4 rating provides peace of mind and often appeals to insurers because claims are extremely rare. Many homeowners report that showing carriers this certification and the lifetime limited warranty leads to lower premiums, effectively subsidizing the roof over its life.

Metal roofing lowers cooling costs because reflective coatings bounce heat away rather than absorbing it like asphalt does. Interlock's energy-efficient colors achieve solar reflectance up to 0.55 and thermal emissivity of 0.84, reflecting the sun's rays and shedding heat. Curtis averages 2,811 annual sunshine hours, and even with modest cooling needs, the reflective surface keeps your roof—and home—noticeably cooler than asphalt. The Cool Roof Rating Council certification backs these numbers, helping offset installation costs through lower energy consumption year-round.

Metal roofing requires far less maintenance than asphalt, wood, or tile. No seasonal cleaning, no fungicide treatment, no algae or moss removal—the aluminum and Alunar coating resist growth, and debris washes away in Curtis's 1,348 mm annual rainfall. Asphalt shingles need inspection every 3–5 years; wood requires staining or sealing; tile needs mortar repair. Interlock's aluminum resists cracking, splitting, curling, and rot—eliminating the maintenance cycle entirely. The CALGreen verification confirms reduced maintenance needs, giving you back your time and money for 50+ years.

The Guardian warranty is a lifetime limited, non-prorated material warranty for the original owner, covering rust, rot, splitting, cracking, curling, and loss of impact resistance. It's transferable once to the next owner with 50 years remaining—a significant resale advantage. With manufacturing since 1998 and installations ranging from coastal salt-air homes to Antarctic research stations, real-world durability far exceeds typical asphalt roofing (15–20 years). Curtis's 45 freeze-thaw days and 1,348 mm rain annually demand a roof designed to last; Interlock's track record and transferable warranty prove it does.

Yes. Curtis averages about 42 cm of snow, 1348 mm of rain, roughly 45 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.