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

Aluminum's smooth, hard surface sheds snow and ice far more effectively than asphalt, which traps moisture and promotes ice dams. Washington Township receives about 91 cm of snow annually across roughly 77 freeze-thaw days per year—conditions that cause asphalt to degrade rapidly through repeated expansion and contraction. Interlock's aluminum panels expand and contract uniformly without cracking, splitting, or curling. The four-way interlocking seams prevent water infiltration even when snow melts and refreezes. You can add snow guards if you prefer retained snow for insulation value, but the roof itself won't suffer structural damage or accelerated aging from the cycle.

Aluminum cannot rust because it contains no iron; steel does, which is why steel roofs eventually corrode and fail. Interlock uses roofing-grade 3105-H24 and 3003-H24 aluminum alloy (ASTM B209), coated on both sides with Alunar 70% PVDF fluorocarbon finish. Even if the coating scratches, aluminum's oxide layer self-heals. This two-sided protection matters in Le Sueur County's 857 mm of annual rainfall—water that would accelerate rust on steel simply runs off aluminum. The Guardian warranty covers rusting for your lifetime, then transfers to the next owner for 50 years. Steel roofs can't make that promise.

No reinforcement needed. Interlock's Slate profile installs at just 0.41 lb/sq ft, and the Mediterranean Tile—despite its authentic tile look—weighs about 96% less than actual clay or concrete tile. Your existing framing can handle it. This lightweight advantage means Interlock often installs directly over your current asphalt shingles without decking replacement, saving you money and keeping your home closed during installation. Washington Township's typical wind gusts reach 100 km/h; the light weight combined with four-way interlocking panels and the 120 mph wind warranty means the roof stays secure even in severe weather without costly structural work.

Four-way interlocking panels are engineered to move together as a unified system. Each panel locks to its neighbors on all four sides, distributing wind loads across the entire roof rather than concentrating stress on fasteners. Interlock warrants the system to resist wind speeds up to 120 mph when installed to specification, and achieves UL 2218 Class 4 impact rating—the highest available. In Washington Township, where gusts regularly approach 100 km/h, this design far exceeds your typical storm exposure. The interlocking geometry also prevents uplift from beneath during wind events that would lift and tear asphalt shingles. Installation quality matters; your local Interlock installer has served the region since 2001.

Interlock achieves UL 2218 Class 4 impact rating—the highest classification—and the warranty even covers perforation from hailstones up to 1.5 inches. Aluminum's hardness and the panel profile's geometry distribute impact energy rather than allowing dents to pool water or crack. Many insurers recognize this durability and offer premium discounts for metal roofs, though your specific savings depend on your carrier and local loss history. Because the roof lasts 50+ years and avoids the claim frequency of asphalt (which often sustains hidden hail damage), insurers view metal roofs as lower risk. Contact your agent with the UL 2218 Class 4 rating and warranty details when renewing your policy.

The Guardian warranty is a lifetime limited, non-prorated material warranty for the original owner—meaning you never pay a depreciated amount for a covered claim. It covers rusting, rotting, splitting, cracking, curling, and loss of impact resistance. The warranty transfers once to the next owner, who receives 50 years of coverage from completion. The Alunar coating itself is warranted 30 years against chalking and fading (ASTM D4214 / D2244 measured). Aluminum's inherent durability—no wood to rot, no steel to rust, no asphalt to break down under 77 annual freeze-thaw cycles in Washington Township—means the roof typically outlasts the warranty period. This is your last roof.

Interlock requires virtually no maintenance—no algae treatments, no wood sealer reapplication, no tile mortar repointing. Occasional gutter cleaning and debris removal (leaves, twigs) are the only regular tasks, the same as with asphalt. The smooth aluminum surface resists moss and algae growth far better than asphalt's porous surface, which traps moisture and organic growth. CALGreen verification confirms the reduced maintenance profile. Tile requires periodic regrouting and re-sealing; cedar shake demands regular staining and sealing to prevent rot. Asphalt attracts algae in humid climates and breaks down under Washington Township's 857 mm annual rainfall. Metal's coating lasts 30 years with zero active maintenance—you simply enjoy the roof while it protects your home.

Installation typically takes 2–4 days for a standard residential roof, depending on roof size and complexity. Yes, Interlock installs directly over existing asphalt shingles in most cases—no tear-off required, which keeps your home closed and saves disposal costs. The lightweight design (Slate at 0.41 lb/sq ft) means no structural concerns and minimal stress on your home's framing during installation. Your local installer has been serving Le Sueur County since 2001 and understands Washington Township's building codes and site conditions. The ICC-ES ESR-1790 evaluation (reissued 2025) confirms code compliance for installation over existing roof assemblies, so you're also protected by design verification.

Aluminum is about 95% recyclable at end of life; asphalt shingles are not. Interlock's manufacturing in Delta, BC, and its multi-decade lifespan mean far fewer roofs sent to landfills over the same 50-100 year period. Asphalt shingles, replaced every 15–20 years, create millions of tons of landfill waste annually. In Washington Township, where you receive 857 mm of rain and 91 cm of snow yearly, asphalt typically needs replacement sooner due to moisture damage and freeze-thaw cycling. Aluminum's durability breaks that tear-off-and-replace cycle entirely. When Interlock eventually reaches end of life, the aluminum enters the scrap market as a valuable commodity, not waste. The panels have been installed from coastal salt-air environments to Antarctica—they're engineered to outlast their surroundings, not to fail on schedule.

Interlock manufactures five profiles: Slate, Cedar Shingle, Shake, Standing Seam, and Mediterranean Tile. Each replicates the traditional look while delivering aluminum's durability, light weight, and near-zero maintenance. Slate suits colonial and modern homes; Cedar Shingle and Shake work for Cape Cod, craftsman, and rustic styles; Mediterranean Tile complements Southwest, Spanish Colonial, and Mediterranean Revival architecture; Standing Seam offers a contemporary industrial aesthetic. All five profiles are available in your Washington Township service area and meet the same ICC-ES ESR-1790 code approval, UL 2218 Class 4 impact rating, and Guardian warranty. Your local Interlock installer can show samples and discuss which profile complements your home's character and neighborhood.

Yes. Washington Township averages about 91 cm of snow, 857 mm of rain, roughly 77 freeze–thaw days a year, with peak wind gusts near 100 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.