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

Interlock's four-way interlocking aluminum panels shed snow efficiently because smooth metal surfaces don't hold moisture the way asphalt does, and the lightweight design (Slate at 0.41 lb/sq ft) eliminates the structural load that forces homeowners to reinforce rafters for slate or tile. Snow guard brackets are available for applications where you want to manage slide-off timing. With roughly 93 freeze-thaw cycles annually in Rockingham County, aluminum's oxide layer won't degrade from repeated freezing; it self-heals when scratched. Ice dams form when heat escapes through poor attic ventilation—a roofing material issue, not a metal-roofing issue—so proper ventilation under any roof type remains essential.

Aluminum cannot rust because it contains no iron; instead, it develops a transparent aluminum oxide layer that actually protects the metal underneath and self-heals when scratched. Interlock uses roofing-grade 3105-H24 aluminum (ASTM B209), with a Alunar 70% PVDF fluorocarbon coating applied to both sides for extra salt-air and moisture protection. Exeter receives about 1025 mm of rain annually plus 116 cm of snow, creating constant moisture exposure. Steel roofing rusts in these conditions; aluminum doesn't. The 30-year coating warranty against chalking and fading (ASTM D4214/D2244) means your roof maintains its appearance while the underlying aluminum remains impervious to corrosion—a genuine lifetime advantage in wet climates.

Freeze-thaw cycling does not damage aluminum because aluminum has no pores that absorb moisture and expand when frozen. With about 93 freeze-thaw days per year in Rockingham County, asphalt shingles and wood deteriorate from repeated expansion and contraction; aluminum simply expands and contracts uniformly without cracking or curling. Steel roofing would rust at the stress points; aluminum's oxide layer strengthens under the same stress. Interlock's Alunar coating, warranted 30 years, maintains flexibility through thermal swings from winter's sub-zero temperatures to spring's thaw cycles. The result is a roof that weathers Exeter's freeze-thaw pattern without the splitting, cracking, or curling that compromises other materials.

Yes. Interlock's four-way interlocking aluminum panels are warranted to resist wind speeds up to 120 mph (193 km/h) when installed to specification, well above Exeter's typical gust pattern (gusts reach about 104 km/h). The interlocking design means each panel clips to its neighbors on all four sides, distributing wind load across the entire roof system rather than relying on fasteners alone. This is verified under ICC-ES ESR-1790 (reissued 2025) and complies with current IBC/IRC wind load requirements. During spring storms when gusts peak, you're protected by engineering, not luck. The warranty covers wind damage, giving you peace of mind through Exeter's windiest months.

No structural reinforcement is needed. Interlock's Mediterranean Tile profile weighs only 0.59 lb/sq ft—about 96% lighter than concrete or clay tile—so it installs directly over most existing roofs without adding the 10–15 lbs per square foot that traditional tile demands. This means no rafter upgrades, no structural engineer consultations, and no construction delays or added cost. Your 1980s home's frame already carries the roof it has; aluminum weighs far less than slate, wood shake, or traditional tile, so you're actually reducing structural load. The lightweight panels also make installation safer and faster, reducing labor hours and overall project cost compared to installing heavy materials that require frame reinforcement.

Interlock's aluminum 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. This non-combustible aluminum construction is recognized by insurers as impact-resistant. Many homeowners see insurance premium reductions or discounts after installing a Class 4 rated roof; contact your agent for specific quotes, as discounts vary by policy and underwriter. With about 3057 sunshine hours annually in Rockingham County, Exeter summers include afternoon thunderstorms that can produce large hail. A Class 4 rated roof gives you physical protection and potential financial benefit—ask your insurer about hail-impact discounts before you commit to a conventional roof that may not qualify.

Aluminum roofing requires far less maintenance than asphalt, wood, or tile. With roughly 1025 mm of rain annually, Exeter's moisture keeps asphalt roofs continuously damp, accelerating algae growth and granule loss; wood shakes split and rot. Aluminum sheds water instantly and resists rot, mold, and insect damage. The Alunar fluorocarbon coating (warranted 30 years) is self-cleaning—rain washes away dust—so you don't power-wash or scrub. Metal roofing is CALGreen-verified for reduced maintenance. Inspections every few years and clearing gutters of debris are all you need. No moss treatments, no shingle replacement patches, no wood staining. Over a 50-year lifespan, aluminum maintenance cost is negligible compared to the ongoing repairs asphalt and wood demand.

Asphalt is cheaper upfront but costs far more over your roof's life. Asphalt lasts 15–20 years, requiring two or three replacements before a 50-year-old homeowner passes the roof to their child. Each tear-off generates landfill waste; each replacement costs $8,000–$15,000 in labor and materials. Interlock's aluminum roof carries a lifetime limited warranty (non-prorated material) for the original owner, transferable to the next owner for 50 years from completion. One installation, no replacements, no landfill burden. Over 50 years, aluminum costs less total despite higher initial investment. Current regional promotion offers no payments and no interest until Spring 2027, or 10% off installation, making the math even simpler. Calculate your total roof cost over 50 years, not just the first bill.

Interlock offers Class A fire classification (non-combustible aluminum) across all profiles—Slate, Cedar Shingle, Shake, Standing Seam, and Mediterranean Tile. Aluminum is non-combustible, meaning it won't ignite or spread flame. Check with your municipality's building department for specific fire-rating requirements; some areas don't mandate it, but if you live in or near a wildfire zone or insurance underwriters prefer Class A, you're covered. Aluminum achieves Class A without additives or coatings that degrade over time—the material itself is inert. The ICC-ES ESR-1790 evaluation (reissued 2025) documents this performance. If fire rating is a requirement or concern, aluminum metal roofing meets the highest standard without compromise to appearance, durability, or warranty.

Interlock Metal Roofing (New England) Inc. serves Exeter and the surrounding region and has been installing Interlock systems since 1999—over 25 years of local experience. The parent company, Interlock, has manufactured its four-way interlocking aluminum panels in Delta, BC since 1998, with installations ranging from coastal homes enduring salt air to an Antarctic research station. Your local installer brings both factory training and two decades of regional climate experience. They understand Rockingham County's snow load (about 116 cm annually), freeze-thaw cycling (roughly 93 cycles per year), and the gusts that exceed 100 km/h. When you call for a quote, you're speaking with installers who know Exeter's specific challenges and have proven track records with your neighbors.