Aluminum Roofing · Oregon
Aluminum roofing, built for Oregon
Aluminum is the one roofing metal that answers all of this state's roof-killers at once: it sheds the moss that relentless valley rain feeds, it cannot rust in coastal salt air, it is interlocked against the wind the Gorge funnels, and Class A fire-rated assemblies are available for wildfire country. We've installed it for Pacific Northwest homeowners since 1997.
The numbers, verified
Installed weight
0.41 psf (shingle/diamond) · 0.58 shake · 0.59 tile
ICC-ES ESR-1790
Impact rating
UL 2218 Class 4 — highest class
Intertek 33876
Fire rating
Class A or B assembly with listed fire-resistant deck protection
ICC-ES ESR-1790 §4.4
Wind
120-mph warranty · uplift tested to 177.5 psf
Guardian Warranty · ICC-ES ESR-1790
Corrosion
Cannot rust — aluminum, not steel
Material property
Finish
Alunar® PVDF — 1,000-hr salt spray, 2,000-hr weathering
ASTM B117 · G155 (CCMC 10475-R)
Coating warranty
30 yrs — chalk ≤8, fade ≤5 Hunter ΔE
ASTM D-4214 · D-2244
Recycled content
~95% recycled aluminum, fully recyclable
Manufacturer spec
Full engineering documentation is published by the manufacturer, Interlock Roofing Ltd., and mirrored on our proof page.
Why aluminum is the right metal for Oregon roofs
Every roofing material fights this state on three fronts: eight months of moss-feeding rain west of the Cascades, salt air on the coast, and sustained wind where the Columbia Gorge funnels it — with wildfire as the fourth front east and south. Aluminum is the only premium roofing metal that answers all of them at once. It cannot rust, so the salt question that disqualifies steel from Astoria to Florence simply doesn't apply. Its smooth PVDF surface gives moss nothing to root into, ending the cleaning cycle that shortens asphalt's life. It weighs about 0.41 pounds per square foot installed — a fraction of slate's 9 psf — so the framing under Willamette Valley farmhouses and Portland Victorians carries it without reinforcement. And in interlocking panel form, every edge locks mechanically to its neighbors — the assembly behind the ICC-ES ESR-1790 wind-uplift rating of 177.5 psf, with Class A fire-rated assemblies available.
Interlocking panels vs. standing seam vs. exposed-fastener metal
Not all aluminum roofing behaves the same in this climate. Exposed-fastener panels — the budget option — put thousands of gasketed screws through the weather surface; months of wind-driven Oregon rain and thermal cycling work them loose within a decade. Standing seam performs well but brings long panels that can oil-can on big visible planes and a vertical-rib look many older streetscapes resist. Interlocking shingle-format panels are the third path: four-way mechanical locks, concealed fasteners, and traditional shingle, shake, slate, and tile profiles that read correctly on a Craftsman or foursquare. That third path is the only system we install.
The moss case, from nearly three decades in the Northwest
Moss is western Oregon's defining roof problem: Portland sees roughly 58 inches of rain a year, asphalt's granular surface holds that moisture, and moss colonizes the shaded slopes — lifting shingle edges, ponding water against the deck, and drafting the homeowner into a wash-and-treat cycle that itself strips granules and shortens the roof's life. A smooth interlocked aluminum field gives moss nothing to root into and no grit to hold moisture, so growth sheds with the rain instead of taking hold. We pair the panels with an attic and ventilation assessment on every estimate, because the permanent fix is the assembly, not any single layer.
What it costs — and what it replaces
An aluminum roof costs more than asphalt on day one and less than asphalt over the life of the house. Asphalt west of the Cascades realistically delivers 15–25 years before moss, wind, and winter rain finish it — and every cleaning bought in between shortens that number. A homeowner who stays put pays for that roof twice, plus disposal, plus treatments. The aluminum install is one decision, warranted for life, transferable to the next owner. Our cost page publishes honest regional ranges, and financing options are available.
Choose your profile
Every profile is the same interlocked aluminum underneath — the choice is architectural. Shingle for ranches and foursquares, shake for Craftsmans and shingle-style coastal homes, slate for Victorians, tile for Mediterranean-influenced builds (full product specs on the manufacturer's site). Explore the roof collection, review cost considerations, or read the material specifications.
Aluminum roofing questions, answered
Is aluminum a good roofing material for Oregon?
Yes — arguably the best-matched metal for this climate. Aluminum cannot rust in coastal salt air, its smooth finish sheds the moss that colonizes asphalt west of the Cascades, it weighs only about 0.41 lb per square foot, and Class A fire-rated assemblies are available for wildfire-exposed homes. Our documented installs across Oregon since 1997 are the proof.
How much does an aluminum roof cost in Oregon?
More upfront than asphalt, less over the life of the house. Oregon pricing reflects complex rooflines, steep moss-softened tear-offs, and regional labor. Because asphalt west of the Cascades typically lasts only 15–25 years — less where moss takes hold — one lifetime aluminum roof competes with two to three asphalt replacement cycles. See our cost page for honest regional ranges.
Are aluminum shingles right for an Oregon home?
For most of the state's housing stock, yes. Shingle-size panels lock on all four edges with concealed fasteners — no exposed seams for wind-driven winter rain, no free tabs for Gorge or coastal gusts — in traditional profiles that read correctly on a Portland foursquare, a Willamette Valley farmhouse, or a coastal shingle-style home. Full product specifications for the aluminum shingle system are published by the manufacturer at interlockroofing.com; this page covers the regional decision: fit, cost logic, and our Oregon install record.
How are Interlock aluminum shingles fastened?
Slate and Cedar Shingle panels carry a full-length nailing tab across the top edge, pre-punched for four fasteners driven directly into the roof deck — not a single corner tab, and no separate clips. Each panel is anchored to the decking at four points across its width and then locked to its neighbors on all four sides, which is the combination behind the warranted 120 mph wind rating (installed to manufacturer specification).
Do aluminum roofs stop moss?
They remove what moss needs. Moss roots into asphalt's granular, moisture-holding surface; a smooth PVDF-coated aluminum panel holds neither the moisture nor the grit, so growth washes off with the rain instead of colonizing the shaded slope. That ends the wash-treat-repeat cycle — and the granule loss every cleaning inflicts on asphalt. We still check shade, debris, and attic ventilation on every estimate, because a healthy roof is the whole assembly.
Will an aluminum roof survive coastal salt air?
Aluminum cannot rust — full stop. That is the decisive difference from steel (including stone-coated steel), which corrodes at scratches and cut edges. From Astoria to Florence, our coastal installs carry the same warranty as inland ones, with a PVDF (Kynar 500-family) Alunar finish rated for salt-air exposure.
Is an aluminum roof a good choice in wildfire country?
Yes. Aluminum is non-combustible, and Class A fire-rated assemblies — the highest rating — are available (ASTM E108, installed with GAF VersaShield per ICC-ES ESR-2053). For Oregon homeowners hardening a home against wildfire, the roof is the largest single surface you can make non-combustible.
How long does an aluminum roof last?
It is engineered and warranted as the last roof the house needs: The Guardian Warranty — lifetime coverage, transferable once (extending 50 years of coverage to the next owner). We have installed the system for Pacific Northwest homeowners since 1997.
See it on a street near you — every documented install is on the map.