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Metal Roofing Products

Interlock® Copper Roofing: Solid Copper, Century-Long Lifespan

Copper roofing is one of the most durable, beautiful, and prestigious roofing materials available — with a proven lifespan exceeding 100 years on properly installed structures.

Discover Interlock Copper Roofing — engineered to last the lifetime of your home with zero maintenance and a Lifetime Transferable Warranty.

Overview

What Is Copper Roofing?

Interlock® Copper Roofing is manufactured from solid 16 oz. or 20 oz. copper — not copper-plated steel, not copper foil — formed into the same interlocking geometries as the aluminum line: Slate, Cedar Shingle, Shake, and Mediterranean Tile. Hidden fasteners protect connection points on every profile. After installation, the roof evolves from bright mill-finish copper through warm bronze tones to a stable variegated verdigris over 30–35 years — a patina that is chemically protective, not merely decorative. Covered by the Guardian Lifetime Limited Non-Prorated Material Warranty.

Copper's service record is measured in centuries: the copper-clad cathedrals of Northern Europe and civic institutions worldwide carry roofing that has outlasted every other building material around it. The reason is elemental — copper does not rust, does not become brittle, and develops a patina layer that actively protects against further oxidation. At 100 lbs per square (16 oz.) or 125 lbs per square (20 oz. Mediterranean Tile), structural assessment is recommended for retrofit applications. Inherently non-combustible and resistant to salt water, severe weather, and industrial corrosion — no coating system required.

Copper requires careful detailing: runoff will stain masonry and concrete if drainage is unmanaged, and incompatible metal contact creates galvanic corrosion — which is why Interlock specifies non-corrosive stainless steel hardware throughout and recommends professional installation via its dealer network. Patina accelerant solutions allow a fully weathered appearance at project completion. Installed correctly, copper will never need replacement, grows more architecturally distinctive as the structure ages, and retains significant material salvage value at any point in its life. For a generational roofing investment, no material qualifies more completely.

Who It's For

Copper Roofing for Every Professional

Interlock Copper Roofing is the finest roofing material available — full stop. No other product combines multi-century service life, zero maintenance demand, and an evolving visual character that becomes more beautiful with age. Solid 16 oz. or 20 oz. copper panels develop a natural patina over 30–35 years, progressing from bright penny copper through bronze, brown, and ultimately verdigris green. Available in Slate, Cedar Shingle, Shake, and Mediterranean Tile profiles, Interlock Copper adapts to your home's architecture without compromise. It is 100% recyclable, requiring no chemical coatings and no eventual landfill contribution. The Guardian Lifetime Limited Non-Prorated Material Warranty covers Interlock Copper for the life of your structure. For homeowners who want the absolute best, copper is the only answer.

Interlock Copper Roofing is available in 16 oz. (approximately 100 lbs per square) and 20 oz. (approximately 125 lbs per square) solid copper, in Slate, Cedar Shingle, Shake, and Mediterranean Tile profiles. Specify CSI MasterFormat section per selected profile: 07 31 16 (Metal Shingles — Slate, Cedar Shingle) or 07 41 13 (Metal Roof Panels — Shake, Mediterranean Tile). No synthetic coating is applied. Copper's inherent antimicrobial properties and corrosion resistance eliminate coating specification requirements. Patina evolution — from bright copper through bronze, brown, and verdigris — occurs naturally over 30–35 years. Surface corrosion and patina uniformity are not warranted, consistent with industry-standard copper roofing practice. Class A fire rating is inherent to copper assemblies. Hidden fastener installation. Minimum slope: 4:12. The Guardian Lifetime Limited Non-Prorated Warranty covers Interlock Copper with noted material-specific exclusions. 100% recyclable. No VOC content.

Interlock Copper Roofing installs identically to Interlock aluminum panels in the same profile — same interlocking geometry, same hidden fastener approach, same installation sequences. Available in 16 oz. and 20 oz. copper in Slate, Cedar Shingle, Shake, and Mediterranean Tile profiles, panels arrive pre-formed and ready to install without field fabrication. Key jobsite considerations: Do not allow copper to contact aluminum or ferrous metals directly — use appropriate separation tape or gaskets at all contact points to prevent galvanic corrosion. Store panels flat and off the ground. Minimum slope: 4:12. No coatings, sealants, or touch-up compounds are required or recommended. The Guardian Lifetime Limited Non-Prorated Warranty covers installations completed per Interlock's certified documentation. Surface corrosion and patina uniformity are not warranted — communicate this clearly to project owners prior to sale.

KEY ADVANTAGES

The Interlock Copper Roofing Advantage

Lifetime Transferable Warranty

Every Interlock installation is backed by a Lifetime Transferable Warranty — the strongest warranty in the roofing industry. Coverage transfers to subsequent owners at resale.

Class 4 Impact Resistance

Achieves the highest UL 2218 impact rating — Class 4 — withstanding hailstones up to 2 inches. Many insurers offer premium discounts for Class 4 rated roofing.

Class A Fire Resistance available

Class A fire rating available under ASTM E108 — the highest fire resistance classification, subject to proper underlayment and installation. Superior protection compared to asphalt shingles and untreated wood profiles.

120+ MPH Wind Resistance

The four-way interlocking system creates a unified surface resisting hurricane-force wind uplift. No exposed fastener points means no fastener-failure leak risk.

Energy-Efficient Aluminum

Aluminum reflects solar radiation and releases heat rapidly at night, reducing cooling loads and summer energy costs compared to dark asphalt roofing materials.

Low Lifetime Maintenance

No painting, sealing, granule replacement, or re-nailing — ever. Occasional debris rinsing is all that is required. Eliminate roof maintenance from your budget permanently.

Technical Data

Product Specifications

Base Material & Alloy Specification	Solid copper — 16 oz. or 20 oz. per sq ft. Not copper-plated, not copper foil. Hidden fastener system on all profiles
Panel Gauge & Nominal Base Thickness	16 oz. copper = ~0.0216" (0.549mm); 20 oz. copper = ~0.027" (0.686mm). Expressed by weight designation per industry standard
Installed Weight Per Square	16 oz. profiles: ~100 lbs per 100 sq ft; 20 oz. Mediterranean Tile: ~125 lbs per 100 sq ft
Hail Impact Resistance Rating	Class 4 — UL 2218
Fire Resistance Rating	Class A fire rating available (requires GAF Versashield Fire-Resistant Roof Deck Protection per ICC-ES ESR-2053; self-adhered underlayment = non-classified assembly)
Wind Speed Resistance — Manufacturer Warranted	120 mph (193 kph) — warranted per manufacturer's installation procedures
Surface Coating System & Finish Warranty	No coating applied — copper develops a natural living patina: bright copper → bronze → variegated green over 30–35 years. Patina accelerant solutions available to achieve aged appearance in 24 hours
Panel Size, Weather Exposure & Coverage Geometry	Varies by profile — copper is available in all Interlock profile shapes (Slate, Cedar Shingle, Shake, Mediterranean Tile). Rustic Shake: 4 ft. panels with six shake impressions (relief height ¾" to 1⅜")
Material Warranty Program Name	Guardian Lifetime Limited Material Warranty — one-time transferable
Warranty Duration, Ownership Terms & Transferability	Lifetime for original registered owner (individual); 50 years from Substantial Completion for organizations or upon transfer to 2nd owner ($300 transfer fee)
Recycled Content & End-of-Life Recyclability	100% recyclable — every ounce of copper is recycled due to its high salvage value. Classified as a Green Roofing Product
Cool Roof Energy Rating & Third-Party Certification	Cool Roof rated — CRRC (Cool Roof Rating Council) and ORNL (Oak Ridge National Laboratories) tested
CSI MasterFormat Division & Section Reference	07 31 16 — Metal Shingles (Slate, Cedar, Diamond profiles); 07 41 13 — Metal Roof Panels (Shake, Tile profiles)

Available Colors

Color Options

Interlock Solid Copper 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, conforming to ASTM B370 — the recognized North American standard for cold-rolled copper sheet in building applications). 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, because no such layer exists. 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 cathedrals across Europe in continuous service for more than eight hundred years. New Interlock copper 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. Solid copper panels are rated UL 790 Class A for external fire, UL 2218 Class 4 for impact (the highest classification issued, qualifying many homeowners for hail-related insurance premium credits), wind-uplift evaluated to ASTM E1592, and conform to the metal-roofing provisions of IBC §1507.4 and IRC §R905.10 under CSI MasterFormat 07 41 13 — Metal Roof Panels. Solar-array compatible, 100% recyclable at end-of-service, and free of fluoropolymers, plasticizers, and granular fillers, architectural copper is documented by the Copper Development Association as one of the most circular materials in the built environment and qualifies for applicable LEED Materials & Resources credit contributions and Environmental Product Declarations. Every Interlock copper installation is backed by the Interlock Lifetime Transferable Warranty, applied to a material whose verifiable service life is measured in centuries rather than decades — and engineered into Interlock’s concealed-fastener interlocking panel geometry, the original North American permanent-metal residential roofing system, refined across six decades of continuous manufacture. Because copper is a single specification — not a palette — Interlock provides physical material samples rather than printed swatch cards, so homeowners, architects, and specifiers can evaluate gauge, weight, and authentic hand in person. Contact your local Interlock dealer to request a solid-copper sample, current gauge availability, panel profile drawings, fastener schedules, and full CSI 07 41 13 specification language ready for project submittal.

Material Comparison

Copper Roofing vs. Asphalt Shingles vs. Stone-Coated Steel

How does Interlock Copper Roofing compare on the metrics that matter most? Review the key performance differences below.

	Interlock Copper Roofing	Asphalt Shingles	Stone-Coated Steel
Lifespan	100+ years	15-25 years	40-50 years
Weight	~100-125 lbs/square (16 oz / 20 oz)	250-350 lbs/square	140-180 lbs/square
Fire Rating	Class A (inherent / non-combustible)	Class A (with mat)	Class A
Warranty	Lifetime Transferable	20-30 year limited	30-50 year limited
Maintenance	Low maintenance	Periodic inspection	Periodic inspection (granule loss)

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

Copper Roofing — Frequently Asked Questions

How long does a copper roof last?

Copper roofing is one of the longest-lasting roofing materials documented, with proven lifespans exceeding 100 years on historic structures. Interlock copper roofing systems are engineered to maintain structural integrity for the lifetime of the building, making them a genuine once-in-a-structure investment.

Does copper roofing turn green, and how long does it take?

Interlock Copper Roofing represents a premium investment reflecting the cost of solid copper as a raw material — priced significantly higher than aluminum and asphalt alternatives, consistent with copper’s standing as the finest natural roofing material available. Exact pricing depends on gauge selection (16 oz. vs. 20 oz.), profile choice, roof complexity, and regional labor rates. Contact an authorized Interlock installer for a project-specific quote. Copper’s multi-century service life, zero maintenance requirements, and inherent material value make it the definitive long-term roofing investment for homeowners who want the absolute best.

How much does copper roofing cost per square foot?

Copper roofing is a premium investment, typically ranging from $25-$50+ per square foot installed depending on profile, region, and project scope. On a total-cost-of-ownership basis over 100 years, copper is often comparable to or less expensive than multiple replacements of lower-cost materials.

Is copper roofing good for historic restoration?

Copper is the preferred material for historic preservation projects and is often required by preservation standards including the Secretary of the Interior’s Standards for Rehabilitation. Interlock copper profiles are available in options suitable for both new construction and historic restoration applications.

How heavy is copper roofing?

Interlock aluminum panels weigh approximately 40-50 lbs per square (100 sq ft). This is a fraction of the weight of concrete tile (900+ lbs/sq) and natural slate (800-1,500 lbs/sq), making Interlock suitable for virtually any standard residential roof structure without structural reinforcement.

Can Interlock Copper Roofing be installed over my existing roof?

In many cases, yes — Interlock Copper panels can be installed over existing asphalt shingles without full tear-off, subject to local building code requirements, current layer count, and deck condition. Your authorized Interlock installer will inspect the existing decking to confirm eligibility. Because copper panels are heavier than aluminum — approximately 100 lbs per square (16 oz.) or 125 lbs per square (20 oz.) — a structural assessment is recommended on older or heavily loaded structures. Where tear-off is required, Interlock installers manage the complete removal process. Either way, the result is a roofing system designed for multi-century performance.

Is the copper patina uniform across the entire roof?

Patina development on copper is a natural process and is not uniform across all panels. Environmental exposure, slope, drainage patterns, shadow areas, and panel orientation all influence the rate and character of patina evolution. This natural variation is considered a signature characteristic of copper roofing — not a defect — and is expressly excluded from the Guardian Lifetime Limited Non-Prorated Warranty, consistent with industry-standard copper warranty practice. If visual uniformity is a design priority, discuss this with your authorized Interlock installer before product selection. Most copper roofing owners consider the evolving, non-uniform patina to be a defining part of copper’s enduring aesthetic appeal.

What profiles is Interlock Copper Roofing available in?

Interlock Copper Roofing is available in four profiles: Slate, Cedar Shingle, Shake, and Mediterranean Tile. Each profile delivers the same solid copper material — 16 oz. for Slate, Cedar Shingle, and Shake; 20 oz. for Mediterranean Tile — with the same hidden fastener installation system. Profile selection allows the copper material to complement any architectural style, from traditional and craftsman to Mediterranean and European classical. Contact your authorized Interlock installer to review profile options and specify gauge based on your project’s structural load and design requirements.

Is Interlock Copper Roofing fire rated?

Yes. Solid copper is inherently non-combustible, and Interlock Copper Roofing assemblies achieve Class A fire rating — the highest classification under UL and ICC standards. This rating is inherent to the copper material itself and does not require a specialized fire-resistant underlayment system to achieve Class A designation, unlike aluminum assemblies that require GAF Versashield for Class A classification. Confirm specific assembly requirements with your authorized Interlock installer and local building authority to ensure code compliance in your jurisdiction.

Can the Interlock Copper warranty be transferred to a new owner?

Yes. The Guardian Lifetime Limited Non-Prorated Material Warranty covering Interlock Copper Roofing is transferable once to a subsequent owner. Original individual owners hold a lifetime warranty; organizations and subsequent individual owners hold a 50-year non-prorated warranty. A $300 transfer fee applies, and transfer must be registered with Interlock Roofing within the required notification period. Note that the warranty expressly excludes surface corrosion and patina uniformity, which are natural characteristics of copper — not material defects. Contact Interlock Roofing directly to initiate the transfer process and obtain the current warranty transfer form.