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

Metal roofing sheds snow and ice far more effectively than asphalt because its smooth, hard surface prevents moisture from bonding to the substrate. Windham receives about 120 cm of snow annually plus roughly 98 freeze-thaw cycles per year—conditions that cause asphalt to crack and curl as it expands and contracts. Interlock's four-way interlocking aluminum panels remain dimensionally stable through this cycling. Snow slides cleanly off the lightweight metal surface without adding structural load; optional snow guards are available if you want controlled release. The panel profiles channel meltwater away from seams, preventing ice dam formation along your eaves.

Asphalt absorbs moisture and expands when wet, then contracts as it freezes—this repeated stress over 98 annual freeze-thaw days causes cracking, curling, and granule loss. Aluminum does not absorb water and has a linear thermal expansion coefficient of roughly 23.6 ppm/°C, which is predictable and uniform across the panels. The Alunar® 70% PVDF coating on both sides of each panel resists this cycling for 30 years without chalking or fading, verified under ASTM D4214 standards. Your roof remains watertight through decades of New England's temperature swings without deterioration or maintenance.

Yes—Interlock panels are warranted to withstand wind speeds up to 120 mph when installed to specification, well above Windham's typical gust speeds of about 107 km/h (66 mph). The four-way interlocking design locks each panel to its neighbors, creating a unified system that distributes wind load across the entire roof rather than allowing individual panels to lift or peel. This mechanical interlock is verified under ICC-ES evaluation report ESR-1790 (reissued 2025 for IBC/IRC compliance). Even during nor'easters and sudden wind events common to New Hampshire, your roof remains structurally secure.

No structural reinforcement is needed. The Interlock Slate installs at roughly 0.41 lb/sq ft, and the Mediterranean Tile profile—despite its authentic appearance—weighs about 0.59 lb/sq ft and is approximately 96% lighter than genuine clay or concrete tile. Most existing roof structures easily support this minimal load. Because the panels are so light, Interlock installs directly over your existing asphalt shingles in most cases, eliminating expensive tear-off labor and landfill costs. Your home's framing carries a lighter load than traditional tile, concrete, or even some slate installations, while gaining superior durability.

Yes, in most cases. Interlock's lightweight panels install directly over existing asphalt shingles without tear-off, reducing labor and keeping waste out of landfills. A qualified installer inspects your deck to ensure it is sound and properly fastened; minor repairs are made as needed. The installation process typically takes a few days depending on roof size and complexity. Our local installer, Interlock Metal Roofing (New England) Inc., has served the region since 1999 and follows ICC-ES ESR-1790 specifications for fastening and sealing. The result is a watertight, durable roof installed over your existing structure—no disruption to your home's interior.

Interlock achieves UL 2218 Class 4 impact rating—the highest available—and the Guardian Warranty even covers perforation from hailstones up to 1.5 inches. This superior impact resistance qualifies many homeowners for insurance discounts because metal roofs require fewer claims than asphalt in hail-prone regions. Contact your insurance agent with the UL 2218 Class 4 rating and your proof of installation; many carriers recognize this as a risk reduction and adjust premiums accordingly. In Windham's climate, where hail events occur alongside other severe weather, this combination of durability and documented impact resistance can meaningfully lower your long-term insurance costs.

The Guardian Warranty is a lifetime limited, non-prorated material warranty for the original owner, covering rusting, rotting, splitting, cracking, curling, and loss of impact resistance. It is transferable once to the next owner for 50 years from completion, adding substantial resale value. Interlock panels have been installed since 1998 and perform reliably through decades of temperature cycling, snow, and rain. The Alunar® coating is separately warranted for 30 years against chalking and fading. In practice, homeowners in climates similar to Windham's—with about 120 cm of snow, 1007 mm rain, and 98 freeze-thaw days annually—report roofs functioning flawlessly for 40+ years with zero maintenance.

energy-efficient Interlock colors with thermal emissivity of 0.84 and initial solar reflectance up to 0.55 (Aged Copper Penny) reflect heat that asphalt absorbs, lowering peak attic temperatures and reducing cooling load on hot days. Cool Roof Rating Council ratings confirm this reflectance advantage. With Windham receiving about 3018 sunshine hours annually, lighter-colored finishes can deliver meaningful cooling savings, especially in summer. Metal roofs also allow better ventilation under the panels when installed with proper underlayment, further reducing heat buildup. For homeowners seeking lower energy costs and a roof that stays cooler in the sun, Interlock's reflective coatings provide measurable benefit.

Interlock metal roofing requires virtually no maintenance. Unlike asphalt, which sheds granules and requires sealant reapplication, aluminum panels do not degrade or shed. Unlike wood shake or cedar shingle, which split, curl, and rot—especially in Windham's 98 annual freeze-thaw cycles—metal remains dimensionally stable indefinitely. The Alunar® 70% PVDF coating (warranted 30 years) resists chalking and fading under about 3018 annual sunshine hours without touch-up. You never need to pressure-wash, reseal, or replace sections. Occasional gutter cleaning is standard for any roof, but the metal roof itself requires zero maintenance for its 40+ year lifespan, making it the lowest-maintenance option available.

Yes. Interlock panels are approximately 95% recyclable aluminum, ending the asphalt tear-off-to-landfill cycle that removes millions of tons of shingles annually. Aluminum itself is infinitely recyclable without loss of properties; used panels return to manufacturing rather than decomposing in landfills for centuries. Because Interlock installs over existing asphalt in most cases, you avoid the energy and waste of tearing off your old roof. The lightweight design reduces transportation impact compared to slate, tile, or concrete alternatives. CALGreen verification confirms reduced maintenance requirements throughout the roof's life. Choosing metal roofing is a direct way to reduce your home's landfill contribution and support a circular material economy.