Metal Roofing Built for Stevenson's Heavy Rain, Snow Loads, Windstorms & Lifetime Protection

Performance you can measure (all climates):
• Available through authorized Interlock® installers serving Stevenson and Skamania County for local code familiarity and jobsite oversight
• Aluminum coated with the Alunar® Coating System (no visible aluminum surface) for long-term finish retention in wet climates
• Precision weatherproof seams (profiles: slate, cedar, shake, tile) and mechanical fastening (profile: standing seam) deliver long-term leak protection during wind-driven rain events
• Tested to 193+ km/h (120+ mph) to resist severe Gorge windstorms and Columbia River gust loading
• Advanced under‑seal and edge details minimize water intrusion during Stevenson’s atmospheric-river events and prolonged storm runs
• Corrosion-resistant aluminum construction defends against marine-influenced air when Pacific moisture is drawn inland through the Columbia Gorge
• Snow-shedding panel geometry reduces rooftop snow loads and helps prevent sustained ice build-up in Skamania County’s cold snaps
• Designed to tolerate frequent freeze–thaw cycles with minimal thermal movement and reduced risk of seam fatigue
• Class A fire-rated available for added assurance in dry-season ember-risk periods affecting inland Washington communities
• UL 2218 Class 4 impact resistance for protection from hail, falling branches, and windborne debris common in wooded Gorge environments
• Cool-roof performance lowers summertime heat transfer and improves attic comfort during occasional inland heat waves
• Engineered for bracket-mounted photovoltaic systems to simplify solar integration on Stevenson homes
• Fully recyclable aluminum supports local sustainability goals and reduces lifecycle environmental impact
• Low-maintenance finish and profile curb biological growth; fewer roof replacements in Stevenson’s damp, moss-prone conditions
• Specialized surface treatment and installation details limit moss adhesion and simplify seasonal cleaning on shaded Gorge roofs
• Backed by a Lifetime‑Limited transferable warranty and local installer support to preserve long-term resale value in Skamania County
Interlock Metal Roofing (PNW) Inc.
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Interlock® Aluminum Roofing — all-climates performance specs for Stevenson, Washington
| Spec / Rating | Climate / Risk Factor + What It Solves |
|---|---|
| Wind resistance: 120+ mph (193+ kph) | Extreme wind, hurricanes, storm uplift: full interlocking attachment helps prevent blow-offs, edge lifting, and panel loss in high-gust events. |
| Fire rating: Class A (with proper assembly) | Wildfire, embers, radiant heat, chimney sparks: non-combustible roof assembly provides the highest residential fire protection rating. |
| Hail resistance: UL 2218 Class 4 | Hail and impact debris: highest impact classification; resists cracking, splitting, and surface loss common with asphalt under hail strikes. |
| Snow & ice performance: interlocking, shedding profile | Heavy snow, freeze-thaw, ice dams: smooth aluminum sheds snow efficiently and the interlocking design helps block water intrusion when melt-refreeze cycles occur. (Final snow-load capacity depends on roof structure and local code.) |
| Corrosion resistance: aluminum (won’t rust) | Salt air, coastal humidity, wet climates: aluminum naturally resists rust and corrosion, reducing long-term failure risk in marine or high-moisture environments. |
| Heat / UV durability: baked-on coating system | High heat, intense sun, thermal cycling: coatings resist UV breakdown and temperature-swing fatigue, slowing fading and surface degradation. |
| Moss / algae resistance: smooth coated surface | Wet shade, organic growth: low-porosity metal surface gives moss/algae less to grip, reducing staining and maintenance. |
| Material: heavy-gauge aluminum roof profiles (Slate / Shake / Shingle / Tile / Standing Seam) | All-season structural stability: lightweight, dent-resistant metal system stays stable through large hot-cold swings and severe weather. (Add exact alloy + thickness for maximum spec proof.) |
| Expected lifespan: 50+ years | Long-term durability across climates: avoids re-roof cycles typical of shorter-life materials, even in high-stress environments. |
| Warranty: Lifetime-Limited, non-prorated + 50-year transferable | Lifetime protection + resale value: guarantees long-term material confidence and transfers to future owners. |
Available Profiles in Stevenson, Washington:
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Metal Roofing FAQs for Homeowners in Stevenson
The following metal roofing FAQs are designed specifically for homeowners in Stevenson, Washington. Whether you are building a new home or replacing an existing roof, understanding how roofing materials perform in local weather conditions is essential. From wind and storm protection to fire resistance, hail impact, snow loads, and coastal moisture exposure, Interlock’s Lifetime Aluminum Roofing System is engineered to provide long-term durability, energy efficiency, and peace of mind in Stevenson.





