Metal Roofing in Grafton, New Hampshire — Lifetime Interlock® Aluminum Shingles Installed Locally

Metal roofs shed snow effectively because the smooth, hard surface and thermal properties prevent ice dams that trap moisture on asphalt shingles. Grafton averages about 120 cm of snow per year with around 93 freeze-thaw cycles, which accelerates asphalt deterioration—the constant melting and refreezing breaks down the binder. Interlock's four-way interlocking aluminum panels are sealed tight, and the lightweight design means no sagging under load. Snow guards are available if you want controlled shedding off a particular edge.

Asphalt absorbs moisture, and when water freezes inside it, expansion cracks the material—this repeats roughly 93 times each year in Grafton County. Aluminum is non-porous and doesn't absorb water, so freeze-thaw has no effect on the metal itself. The Alunar 70% PVDF fluorocarbon coating is bonded to both sides of every panel and stays flexible through temperature swings, maintaining its seal for 30 years. After 93 annual cycles over a decade, asphalt becomes brittle; aluminum stays the same.

Aluminum cannot rust because it contains no iron—rust is iron oxide, chemically impossible in pure aluminum. Instead, aluminum naturally forms a microscopically thin, self-healing oxide layer that seals the surface. Even if scratched, this layer reforms within hours. The Alunar coating on both sides provides an additional 30-year warranty against chalking and fading, so corrosion from salt, acid rain, or industrial air isn't a concern. Grafton gets about 847 mm of rain annually; that rain protects rather than damages the metal.

Grafton County experiences typical gusts around 116 km/h, and Interlock's four-way interlocking system is engineered to hold fast. The warranty covers wind speeds up to 120 mph (193 km/h) when installed per spec—that's above the peak gusts your area sees. The mechanical interlock prevents panels from separating or peeling during uplift, and each panel is fastened to the deck below. High-wind testing to UL standards confirms the system's integrity. Over 25 years of installations from coastal British Columbia to Antarctica, wind damage is rare.

Interlock achieves UL 2218 Class 4 impact rating—the highest available—and the warranty covers perforation from hailstones up to 1.5 inches. Many insurers recognize this and offer discounts because claims are extremely rare. Grafton's climate brings rain and snow, not frequent hail, but when severe weather does occur, the non-combustible aluminum and impact-rated profile protect the underlying structure. Class A fire rating is also available, which some carriers reward. Contact your agent with the UL 2218 Class 4 spec to explore savings.

Interlock's aluminum is extraordinarily light—the Slate installs at 0.41 lb per square foot, about 96% lighter than concrete or clay tile. Most homes can support it without reinforcement because the load is negligible compared to traditional tile. This is especially valuable in Grafton, where heavy wet snow (166 cm annually) can stress a roof. If you're replacing asphalt, the new metal weighs even less, so your framing actually works easier. Interlock installs directly over most existing roofs, saving tear-off costs and time.

Metal roofs with energy-efficient colors reflect heat rather than absorb it like asphalt does. Interlock's Cool Roof Rating Council-rated finishes have thermal emissivity of 0.84 and initial solar reflectance up to 0.55, which means less heat enters the attic and less air conditioning load. Grafton gets about 2,958 sunshine hours per year—enough that reflectance matters. On 87-degree days (rare but possible), that reflection cuts cooling energy. The real win in Grafton is winter: the metal doesn't degrade from the 93 annual freeze-thaw cycles, so it keeps performing efficiently for decades.

Installation typically takes 3–5 days for a standard residential roof. Because Interlock panels are so light (0.41–0.59 lb per square foot), they install over most existing asphalt or wood-shake roofs with new underlayment and flashing—no tear-off needed. Grafton winters are long, so working over an existing roof means you avoid weather delays and preserve the temporary protection. Interlock Metal Roofing (New England) Inc. has served this region since 1999, so crews understand local conditions and snow-season scheduling. Current promotion: no payments and no interest until Spring 2027, or 10% off installation.

Aluminum is approximately 95% recyclable and loops back into new products indefinitely, whereas asphalt shingles are tear-off waste heading to landfills. Grafton's 166 cm of snow and freeze-thaw cycling mean asphalt roofs typically last 15–20 years before replacement; a single home over 60 years might generate 10,000+ pounds of landfill debris. Interlock's lifespan breaks that cycle. The lightweight design also reduces installation labor and transportation emissions. CALGreen verification confirms the low-maintenance profile cuts ongoing environmental impact. Choosing metal is one of the highest-impact sustainability decisions a homeowner can make.

Interlock offers five authentic profiles: Slate, Cedar Shingle, Shake, Standing Seam, and Mediterranean Tile. Each replicates traditional materials with dimensional texture and shadow lines visible from street level. The Slate profile suits classic New England homes, Cedar Shingle complements farmhouses, and Mediterranean Tile delivers Old World charm without 96% of the weight of real tile. Standing Seam offers clean, modern lines. All profiles come in multiple colors and carry the same durability—aluminum body, Alunar 70% PVDF coating, UL 2218 Class 4 impact rating, and lifetime warranty. Choose the look you want; the performance is identical.