Metal Roofing in Sherwood, Oregon

No — aluminum cannot rust because it contains no iron. With Sherwood's 1208 mm of annual rainfall and salt-air exposure, an aluminum roof forms a self-healing oxide layer that protects the metal underneath. Even if scratched, that oxide reforms automatically. The roofing-grade 3105-H24 / 3003-H24 aluminum alloy meets ASTM B209 standards, and the dual-sided Alunar 70% PVDF coating (warranted 30 years against chalking and fading) adds a second barrier. Steel roofing rusts; aluminum simply doesn't.

Yes — Interlock panels carry a UL 2218 Class 4 impact rating, the highest available, and the warranty covers perforation from hailstones up to 1.5 inches. That rating matters in Sherwood, where wind gusts can reach 120 km/h and hail can follow. With a Class 4 rating, you may qualify for homeowner's insurance discounts; check with your agent. Many insurers recognize the durability and lower replacement risk, which can offset roof cost over time.

The four-way interlocking panels are warranted to resist wind speeds up to 120 mph when installed to spec — well above Sherwood's typical gust speeds of 120 km/h. The interlocks grip each panel to its neighbors and the deck, distributing wind load across the whole roof rather than stressing fasteners at isolated points. In the Pacific Northwest, where seasonal winds test roofing systems, this design has proven itself on thousands of homes and commercial buildings since Interlock began manufacturing in 1998.

No reinforcement needed. Interlock's Slate installs at about 0.41 pounds per square foot, and the Mediterranean Tile profile — which replicates concrete or clay tile — weighs only 0.59 lb/sq ft, roughly 96% lighter than the real thing. Sherwood homes built for asphalt shingles (around 2.5–3 lb/sq ft) can handle metal roofing with ease. In fact, many homeowners install over existing asphalt without removal, saving labor and keeping debris out of landfills.

The four-way interlocking design sheds water faster than shingles. Sherwood averages 1208 mm of rain annually, and metal's smooth surface allows runoff to move directly to gutters without pooling. The seams between panels are interlocked — not just overlapped — so water cannot work backward under them. Pair that with proper deck, underlayment, and flashing (per ICC-ES ESR-1790 specs), and you get a watertight system that contractors have installed from coastal salt-air homes to an Antarctic research station.

energy-efficient colors reflect heat that asphalt absorbs, lowering surface temperature and cooling load. Interlock's Aged Copper Penny profile achieves initial solar reflectance up to 0.55 and thermal emissivity of 0.84, rated by the Cool Roof Rating Council. Sherwood's 3033 annual sunshine hours may seem modest, but they add up; reflective coatings cut peak-season cooling demand measurably. Over 40+ years of ownership, energy savings contribute to the total value proposition of choosing metal.

The Guardian Warranty offers a lifetime limited, non-prorated material warranty to the original owner, covering rusting, rotting, splitting, cracking, curling, and loss of impact resistance. It transfers once to the next owner for 50 years from completion — a significant advantage when selling. Few roofing products offer that kind of transfer term. Combined with the 30-year coating warranty against fading and chalking, you're buying a roof designed to outlast multiple owners and eliminate the cost cycle of tear-off-and-replace.

Aluminum requires far less. Asphalt shingles fail from UV exposure and thermal cycling; Sherwood's 37 annual freeze-thaw days accelerate that breakdown. Wood shakes rot and split in perpetual Pacific Northwest moisture. Metal doesn't absorb water, resists UV (Alunar 70% PVDF coating, 30-year warranty), and needs only occasional gutter cleaning and inspection — no sealing, no stripping, no replacement until you sell the house. CALGreen verifies Interlock for reduced maintenance, cutting years of labor and cost.

Yes. Metal costs more initially but never needs replacement on your watch — you're buying your last roof. Asphalt requires tear-off and reinstall every 15–25 years; multiply that cycle over four decades. With no rust risk, minimal maintenance, energy savings, potential insurance discounts, and the lifetime warranty covering material defects, the total cost of ownership favors metal. Current financing offers (no payments and no interest until Spring 2027, or 10% off installation) reduce the barrier. Run the math: one replacement cycle covers metal's premium.

Interlock Metal Roofing (PNW) Inc. has served Washington County and the broader region since 1997 — longer than most local contractors. They understand Oregon's wet winters, freeze-thaw stress, and seasonal wind gusts to 120 km/h. They're familiar with local building codes, ICC-ES ESR-1790 compliance, and the installation details that keep roofs watertight through 1208 mm of annual rainfall. Using a regional installer with deep local experience means faster service, easier warranty claims, and crews who know the climate.