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Solid Copper Shake Roofing | 99.9% Pure Architectural Copper | Interlock®

Metal Roofing Products

Interlock® Solid Copper Shake Roofing

The deep relief of hand-split cedar shake in 99.9% pure architectural copper — architectural authenticity for lodge, mountain, ranch, and rustic estate architecture, in a material that will never rot, split, or burn. Backed by the Interlock® Lifetime Transferable Warranty.

Interlock® Solid Copper Shake Roofing reproduces the deep hand-split texture of heavy cedar shake in solid Copper Alloy C11000 (ASTM B370) — the architectural authenticity of shake rendered in a material whose service life is measured in centuries.

Overview

What Is Interlock® Solid Copper Shake Roofing?

Interlock® Solid Copper Shake Roofing is the deep hand-split texture and architectural relief of heavy cedar shake, executed in 99.9% pure electrolytic tough-pitch copper (Copper Alloy C11000) conforming to ASTM B370 — the recognized North American standard for cold-rolled architectural copper sheet. The 4 ft panel format with six shake impressions per course (¾" to 1⅜" relief height) matches Interlock's aluminum Metal Shake panel geometry for visual continuity with lodge, mountain, ranch, and rustic estate architecture — in a substrate engineered to outlast the building itself.

Color is intrinsic to the metal — no PVDF coating, granule layer, or applied finish to fail (unlike the real cedar shake this profile emulates, which fails to rot, splitting, mold, and ember-ignition within 20–40 years). Newly installed Copper Shake panels arrive bright salmon-pink and progress through a documented oxidation sequence: russet bronze within weeks (cuprite, Cu₂O), matte chocolate brown across one to three years (tenorite, CuO), and ultimately the iconic verdigris green-blue patina — a stable copper-sulfate/hydroxysulfate stratum of brochantite, antlerite, and posnjakite that becomes the roof's own self-renewing protective mineral barrier. The same metallurgical process has preserved copper-roofed lodge, civic, and ecclesiastical architecture across North America and Europe for centuries.

At approximately 115–140 lbs per square (the deeper shake profile carries slightly more material than smoother profiles), structural assessment is recommended for retrofit applications. Solid copper carries an inherent Class A fire rating (copper melts at 1,984°F) — a critical safety advantage in wildfire-zone applications where real cedar shake's Class C untreated rating is a defining vulnerability. UL 2218 Class 4 impact resistance, ASTM E1592 wind-uplift performance, specified under CSI MasterFormat 07 41 13, conforming to IBC §1507.4 and IRC §R905.10. Solar-array compatible, 100% recyclable at end of service, and backed by the Interlock® Lifetime Transferable Warranty.

Who It's For

Interlock® Solid Copper Shake for Estates, Architects, and Specifiers

You love the deep, hand-split character of cedar shake architecture — the lodge, mountain, ranch, and rustic estate aesthetic — but you understand that real cedar shake is a Class C fire risk in wildfire zones, a maintenance liability everywhere else, and requires replacement within a generation. Interlock® Solid Copper Shake gives you the deep shake relief in a substrate that develops a living patina, carries an inherent Class A fire rating, and is engineered to outlast the structure. The shake look without the shake risk. Backed by the Interlock® Lifetime Transferable Warranty.

Interlock® Solid Copper Shake is specified under CSI MasterFormat 07 41 13 (Metal Roof Panels). The substrate is Copper Alloy C11000 cold-rolled to architectural sheet per ASTM B370, supplied in 16 oz (~0.0216") or 20 oz (~0.027") nominal weight. Panel geometry: 4 ft panels with six shake impressions per course at ¾" to 1⅜" relief, on Interlock's four-way interlocking concealed-fastener system with stainless steel fasteners specified throughout. Performance: UL 790 Class A fire (inherent / non-combustible per ASTM E136 — a defining advantage over real cedar shake's Class C untreated rating in wildfire-zone specification), UL 2218 Class 4 impact, ASTM E1592 wind-uplift, IBC §1507.4 / IRC §R905.10 conformance. Sustainability: 100% recyclable, contributes to LEED Materials & Resources credits. Full panel profile drawings, fastener schedules, and CSI-formatted submittal language available on request.

Interlock® Solid Copper Shake installs using the four-way interlocking concealed-fastener system with stainless steel fasteners throughout to prevent galvanic corrosion. The deeper shake profile is engineered for efficient panel-to-panel registration despite the substantial relief depth. Copper requires careful detailing for runoff management and incompatible-metal contact must be avoided. Certified Interlock installers receive copper-specific training and technical support. Contact your regional Interlock representative to discuss copper dealer opportunities.

KEY ADVANTAGES

The Interlock® Solid Copper Shake Advantage

Multi-Century Service Life

Copper roofing carries the only roofing service record measured in centuries rather than decades — documented across lodge, civic, and ecclesiastical architecture in North America and Europe. The shake profile you select today will be on the home for generations, not replaced in 20–40 years.

Class A Inherent Fire Resistance

Copper is inherently non-combustible (ASTM E136; melting point 1,984°F) — a defining safety specification for wildfire-zone homes and lodges that would otherwise carry the Class C fire risk of real cedar shake. The shake look without the shake fire risk.

Naturally Evolving Patina Finish

Color is intrinsic to copper — no paint, granule, or organic finish to fail. The roof evolves through documented oxidation chemistry: salmon-pink to russet bronze (weeks), matte chocolate brown CuO (1–3 years), and ultimately verdigris green-blue (brochantite, antlerite, posnjakite). The patina is the material’s self-passivating protective system.

UL 2218 Class 4 Impact / 120 mph Wind

Solid Copper Shake carries the highest UL 2218 hail-impact classification (Class 4) and is warranted to 120 mph wind — backed by the inherent strength of solid copper sheet and Interlock’s four-way interlocking concealed-fastener system. Real cedar shake splits, cracks, and lifts under the same impact and wind exposures.

100% Recyclable Architectural Material

Architectural copper is among the most circular materials in the built environment — 100% recyclable at end of service without performance loss, contributing to LEED Materials & Resources credits and applicable Environmental Product Declarations.

Lifetime Transferable Warranty

Backed by the Interlock® Lifetime Transferable Warranty — applied to a material whose verifiable service life, documented across centuries of lodge, civic, and heritage residential applications, makes solid copper the most defensible long-term roofing investment.

Technical Data

Product Specifications

Base Material & Alloy Specification	Copper Alloy C11000 (electrolytic tough-pitch copper, 99.9% pure) cold-rolled to architectural sheet per ASTM B370
Panel Gauge & Nominal Weight	16 oz/ft² (~0.0216" / 0.549 mm) or 20 oz/ft² (~0.027" / 0.686 mm) — expressed by weight designation per industry standard
Installed Weight Per Square	~115–140 lbs per 100 sq ft (the deeper shake profile carries slightly more material than smoother profiles)
Hail Impact Resistance Rating	Class 4 — UL 2218 (highest classification issued)
Fire Resistance Rating	Class A (inherent / non-combustible per ASTM E136; copper melting point 1,984°F)
Wind Speed Resistance — Manufacturer Warranted	120 mph (193 kph) warranted; wind-uplift evaluated to ASTM E1592
Surface Finish System	None applied. Copper develops a natural multi-stage atmospheric patina (cuprite Cu₂O → tenorite CuO → verdigris [brochantite, antlerite, posnjakite]) — the material's self-passivating protective system
Panel Size, Weather Exposure & Coverage Geometry	4 ft panels with six shake impressions per course; relief height ¾" to 1⅜" (matches Interlock® Metal Shake panel geometry for design continuity with the aluminum line)
Material Warranty Program Name	Interlock Lifetime Transferable Warranty (Guardian Lifetime Limited Non-Prorated Material Warranty)
Warranty Duration, Ownership Terms & Transferability	Lifetime for original registered owner; transferable (one-time) — applied to a material with documented multi-century service life
Recycled Content & End-of-Life Recyclability	100% recyclable at end of service. Architectural copper is routinely fabricated with substantial recycled content per Copper Development Association data
Building Code Conformance & Sustainability Credits	Conforms to IBC §1507.4 and IRC §R905.10 (metal roof panels). Contributes to LEED Materials & Resources credits; Environmental Product Declarations available
CSI MasterFormat Division & Section Reference	07 41 13 — Metal Roof Panels

Available Colors

Patina Evolution — The Living Finish

Interlock® Solid Copper Shake is offered as a single architectural specification rather than a color palette — because copper is not a finish applied to a substrate; it *is* the substrate. Every panel is roll-formed from 99.9% pure electrolytic tough-pitch copper (Copper Alloy C11000, ASTM B370). Color is intrinsic to the metal: there is no paint film, PVDF resin, stone granule, or organic binder to chalk, fade, peel, delaminate, or fail by UV exposure. What replaces a fixed color is a documented oxidation sequence — the same self-passivating chemistry that has preserved the cladding of the Statue of Liberty (1886), the U.S. Capitol Dome (1863), Christ Church Philadelphia (1727), and copper-roofed lodge, civic, and ecclesiastical architecture across North America and Europe in continuous service for centuries. New Interlock® Solid Copper Shake arrives bright salmon-pink and progresses through measurable stages: russet bronze within weeks as cuprite (Cu₂O) forms; matte chocolate-brown tenorite (CuO) across one to three years; and ultimately the iconic verdigris green-blue — a stable copper-sulfate/hydroxysulfate stratum of brochantite (Cu₄SO₄(OH)₆), antlerite (Cu₃SO₄(OH)₄), and posnjakite (Cu₄SO₄(OH)₆·H₂O) that becomes the roof’s own mineral protective barrier. Patina is not deterioration — it is the engineered service life of the material expressing itself. Because copper is a single specification, not a palette, Interlock provides physical material samples rather than printed swatch cards. Contact your local Interlock dealer to request a solid-copper sample and the full architectural specification sheet.

Material Comparison

Solid Copper Shake vs. Real Wood Shake vs. Asphalt Shingles

How does Interlock® Solid Copper Shake compare to real cedar shake and the alternatives a homeowner typically considers for lodge, mountain, ranch, and rustic estate architecture? The numbers tell a clear story about service life, fire safety, and lifetime financial logic.

	Interlock® Solid Copper Shake	Real Wood Shake	Asphalt Shingles
Lifespan	100-200+ years (documented)	20-40 years (rot, split, mold)	15-25 years
Weight	~115-140 lbs/square	200-350 lbs/square	250-350 lbs/square
Fire Rating	Class A (inherent / non-combustible)	Class C (untreated)	Class A (with mat)
Warranty	Lifetime Transferable	Limited or none	20-30 year limited
Maintenance	Essentially maintenance-free (patina self-passivates)	Regular treatment (rot, moss, splitting)	Periodic inspection, re-nailing

Environmental Performance

Sustainability & Energy Efficiency

Interlock Copper Roofing is the most sustainable premium roofing material available — a 100% natural, 100% recyclable solid copper product with no synthetic coatings, no chemical treatments, and no landfill contribution at end of life. Copper’s multi-century service life produces the lowest embodied carbon per year of use of any roofing material on the market. Interlock Copper is certified as a Green Roofing Product, requires zero maintenance throughout its lifespan, and retains full material recovery value when eventually recycled. For architects, developers, and homeowners committed to genuine long-term environmental performance, Interlock Copper Roofing is the definitive sustainable roofing specification.

Interlock Copper may contribute to LEED v4 credits under Materials & Resources (MR) — Recycled Content, and Energy & Atmosphere — Enhanced Energy Performance. Contact your Interlock dealer for LEED documentation support.

Verified Customer Reviews

What Homeowners Say About Interlock Metal Roofing

This is the 3rd roof I have had put on by Interlock Roofing. I put one on my original house, my cottage, and now my new house. They have always done an excellent job, and the aluminum shingles are a great product — light, sturdy, and good-looking, even years down the road.

Bruce M.Wakefield, MA

We had our roof replaced in 2017 with an aluminum roof by Interlock Metal Roofing. We live on the lake, and prior to the replacement, we were spending thousands of dollars every year as the shingles used to fly away in the wind. We have never had any problems in the last 9 years. We had a great experience with Interlock Metal Roofing. They were very professional and did a beautiful job, although it was difficult as our roof is quite high. Our roof is still beautiful, and we have never had a worry about it.

Beena M.Sudbury, ON

I LOVE MY INTERLOCK ROOF! No more climbing up there to clean it off, no more gritty stuff falling into my garden after a few years. It looks fabulous and does what it's supposed to! And then there are the installers: knowledgeable, attentive to detail, and personable. Ivan is a gem! He attended to the addition of a small bit of flashing efficiently and cleaned the whole roof with a blower in short order. After almost ten years, it's STILL the only roof I would choose!

Sue Lyn T.Corvallis, OR

FAQ

Frequently Asked Questions About Solid Copper Shake Roofing

What is Interlock® Solid Copper Shake Roofing?

Interlock® Solid Copper Shake Roofing is the deep hand-split texture of heavy cedar shake executed in 99.9% pure electrolytic tough-pitch copper (Copper Alloy C11000) conforming to ASTM B370. Panel geometry: 4 ft panels with six shake impressions per course at ¾” to 1⅜” relief height, on the four-way interlocking concealed-fastener system. The substrate is solid copper, not coated aluminum or copper-plated steel. Every panel is backed by the Interlock® Lifetime Transferable Warranty applied to a material with documented multi-century service life.

Does copper shake have the same depth as real hand-split cedar shake?

Yes — the relief profile is engineered to match heavy hand-split cedar shake at ¾” to 1⅜” relief height across the 4 ft panel with six shake impressions per course. This is among the deepest residential metal roofing profiles available, designed to read authentically on lodge, mountain estate, and ranch architecture where shake depth is a defining architectural element. The deep relief carries more material than smoother profiles, which is why Copper Shake’s installed weight (~115–140 lbs/sq) is slightly higher than other Interlock copper profiles.

Will copper shake meet wildfire-zone building codes?

Yes — and this is one of solid copper shake’s defining advantages over real cedar shake. Real cedar shake is Class C untreated under ASTM E108 fire testing, a critical liability in wildfire-zone applications. Solid copper is inherently non-combustible per ASTM E136 (melting point 1,984°F), achieving Class A under ASTM E108 / UL 790 by virtue of the material itself. This satisfies wildfire-zone roofing requirements under the International Wildland-Urban Interface Code (IWUIC), California Chapter 7A, Colorado Class 4 wildfire-zone designation, and similar codes — where untreated cedar shake is prohibited.

How does copper shake handle heavy snow loads on mountain homes?

Solid copper has the structural strength and thermal stability to handle heavy snow loads, ice damming, and freeze-thaw cycling without fracture or distortion — a defining performance advantage over real cedar shake (which splits and curls under freeze-thaw) and natural slate (which fractures under impact loading). The four-way interlocking installation system distributes load across the panel field rather than at individual fastener points. Snow guard and ice management systems are compatible with the copper shake panel — specify per project, and your Interlock dealer will detail the assembly.

How long does copper shake last vs. real cedar shake?

Real cedar shake lasts 20–40 years before requiring replacement due to rot, splitting, ember-ignition vulnerability, and freeze-thaw degradation. Solid copper shake is documented at 100–200+ years of continuous service. Over a 50-year ownership window, a real shake roof requires one to two full replacement cycles plus ongoing treatment; a solid copper installation is installed once and never replaced — it develops a patina that is the material’s protective system, not a degradation toward replacement.

Is copper shake too heavy for a mountain home's existing roof framing?

Rarely. At approximately 115–140 lbs per square (the deeper shake profile carries slightly more material than smoother Interlock copper profiles), Copper Shake is well within the load-bearing capacity of standard mountain residential framing — which is typically engineered for heavy snow loads exceeding 40 psf live load. Structural assessment is recommended for retrofit, but reinforcement is rarely required. Real cedar shake assemblies weigh 200–350 lbs/sq when waterlogged, so transitioning to copper actually reduces structural load.

Can copper shake be specified for a lodge or commercial application?

Yes — solid copper shake is appropriate for high-end residential, commercial lodge, hospitality, and institutional applications. The material specification (C11000, ASTM B370) and installation system (concealed-fastener four-way interlocking) are commercial-grade. CSI MasterFormat 07 41 13 (Metal Roof Panels) is the appropriate specification section for architectural project submittals. Lifetime Transferable Warranty applies. Contact your regional Interlock representative for commercial project consultation.

How does the patina look on a rustic or lodge-style home?

The patina evolution complements rustic and lodge-style architecture exceptionally well. The early salmon-pink and russet-bronze stages read as warm and natural against timber, stone, and rustic-finished exterior materials. The mature chocolate-brown CuO stage (years 1–3) reads as deep, weathered, and harmonious with traditional lodge aesthetics. The eventual verdigris stage develops over decades and reads as architecturally distinctive without being incongruous on rustic buildings. For projects requiring a specific patina stage at completion, patina-accelerant solutions are available.

What's the cost difference between copper shake and real wood shake over time?

Upfront, solid copper shake carries a higher initial cost than real cedar shake. Over a 50-year ownership window the math reverses: real cedar shake requires periodic chemical treatment (every 3–7 years), individual shake replacement as splits develop, full re-roofing every 20–40 years, mandatory non-combustible replacement in fire-zone retrofits, and (in many lodge applications) escalating insurance premiums tied to wildfire risk. Solid copper is installed once, never replaced, and qualifies for Class A fire and Class 4 hail insurance credits. The 50-year total cost of ownership reliably favors copper.

Does copper shake work with snow guards and ice management systems?

Yes. Solid copper shake is compatible with snow guard arrays, ice belts, and heat-trace ice management systems. Snow guards and accessories are specified in stainless steel or copper to prevent galvanic corrosion at the contact point. The deep shake profile naturally retains snow longer than smoother roofing profiles — in heavy-snow climates, snow guard placement and density are detailed by the Interlock-certified installer as part of project specification. Contact your regional Interlock representative for snow management consultation on mountain projects.