Copper Roofing Systems
Interlock® Solid Copper Cedar Shingle Roofing
The texture of split cedar shingle in 99.9% pure architectural copper — the warmth of cedar architecture rendered in a material that will not rot, split, burn, or require replacement. Backed by the Interlock® Lifetime Transferable Warranty.
Interlock® Solid Copper Cedar Shingle Roofing reproduces the appearance and texture of split cedar shingles in solid Copper Alloy C11000 (ASTM B370) — the cedar silhouette executed in a material whose service life is measured in centuries rather than decades.
TL;DR Summary
Interlock® Solid Copper Cedar Shingle Roofing reproduces the texture of split cedar shingle in 99.9% pure architectural copper (C11000, ASTM B370). The cedar silhouette executed in a non-combustible material that will not rot, split, mold, or burn — resolving real cedar's Class C fire vulnerability while preserving the Colonial, Craftsman, and Cape Cod architectural language. 100+ year documented service life, Lifetime Transferable Warranty.
Overview
What Is Interlock® Solid Copper Cedar Shingle Roofing?
Interlock® Solid Copper Cedar Shingle Roofing is the texture and silhouette of split cedar shingle, 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 profile matches Interlock's aluminum Metal Cedar Shingle panel geometry for visual continuity with the Colonial, Craftsman, and traditional New England aesthetic; the substrate is solid copper rather than coated aluminum, with the structural strength to render fine cedar texture without thermal distortion.
Color is intrinsic to the metal — no PVDF coating, granule layer, or applied finish to fail, fade, or be replaced (unlike the cedar shingles this profile emulates, which are prone to rot, splitting, mold, and ember-ignition within 20–40 years). Newly installed Copper Cedar Shingle panels arrive bright salmon-pink and typically progress through natural oxidation — russet bronze (cuprite, Cu₂O), matte chocolate brown (tenorite, CuO), and ultimately the iconic verdigris green-blue patina, a copper-sulfate/hydroxysulfate layer of brochantite, antlerite, and posnjakite that forms copper's natural weathered surface. Because patina develops with atmospheric exposure, its rate and uniformity vary from roof to roof and are not guaranteed. The same metallurgical process has weathered copper-roofed colonial and ecclesiastical architecture across North America and Europe for centuries.
Why Colonial and Craftsman Architecture Demands Solid Copper Cedar Shingle
At approximately 100–125 lbs per square (16 oz or 20 oz architectural copper sheet), structural assessment is recommended for retrofit applications. Solid copper carries an inherent Class A fire rating (copper melts at 1,984°F — well above sustained Class A test temperatures) where real cedar shingle is Class C untreated, UL 2218 Class 4 impact resistance where real cedar splits and cracks under impact, and wind-uplift performance evaluated to ASTM E1592 — specified under CSI MasterFormat 07 41 13 and 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.
Table of Contents
- What Is Interlock® Solid Copper Cedar Shingle Roofing?
- Interlock® Solid Copper Cedar Shingle for Heritage, Architects, and Specifiers
- The Interlock® Solid Copper Cedar Shingle Advantage
- Why Solid Copper Roofing Outperforms Every Alternative
- Why a 48-Year Metal Roofing Coatings Veteran Endorses Interlock®
- Product Specifications
- Patina Evolution — The Living Finish
- Solid Copper Cedar Shingle vs. Real Cedar Shingles vs. Asphalt Shingles
- Sustainability & Energy Efficiency
- What Homeowners Say About Interlock Metal Roofing
- Frequently Asked Questions About Solid Copper Cedar Shingle Roofing
- Key Takeaways
Who It's For
Interlock® Solid Copper Cedar Shingle for Heritage, Architects, and Specifiers
You love the warmth and rhythm of split cedar shingle architecture — the Colonial, Craftsman, and Cape Cod tradition — but you want a roof that will outlast the home rather than rot, split, mold, or burn within a generation. Interlock® Solid Copper Cedar Shingle gives you the appearance of split cedar in a substrate that develops a living patina rather than degrading toward replacement. The cedar look that will be on your home in 2100. Backed by the Interlock® Lifetime Transferable Warranty applied to a material whose documented service life is multi-century.
Get Your Free Quote →Interlock® Solid Copper Cedar Shingle 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 matches Interlock Metal Cedar Shingle profile on the four-way interlocking concealed-fastener system, with stainless steel fasteners specified throughout to prevent galvanic corrosion. Performance: UL 790 Class A fire (inherent / non-combustible per ASTM E136 — a defining advantage over real cedar's Class C untreated rating), UL 2218 Class 4 impact, ASTM E1592 wind-uplift, IBC §1507.4 / IRC §R905.10 conformance. Sustainability: 100% recyclable, no fluoropolymers, contributes to LEED Materials & Resources credits. Full panel profile drawings, fastener schedules, and CSI-formatted submittal language available on request.
Download Spec Sheet →Interlock® Solid Copper Cedar Shingle installs using the four-way interlocking concealed-fastener system common to the Interlock® aluminum and copper lines, with stainless steel fasteners throughout to prevent galvanic corrosion. Copper requires careful detailing for runoff management (copper-laden water will stain unsealed masonry and concrete if drainage is unmanaged) 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.
Become a Certified Installer →Key Advantages
The Interlock® Solid Copper Cedar Shingle Advantage
Multi-Century Service Life
Copper roofing carries the only roofing service record measured in centuries rather than decades — documented across colonial, ecclesiastical, and civic architecture in North America and Europe. The cedar shingle profile you select today will be on the home for generations rather than replaced in 20–40 years.
Explore now >Class A Inherent Fire Resistance
Copper is inherently non-combustible (ASTM E136; melting point 1,984°F) — the strongest fire performance specification available, and a defining safety advantage over real cedar shingle's Class C untreated fire rating. The cedar look without the cedar fire risk.
Explore now >Naturally Evolving Patina Finish
Color is intrinsic to copper — no paint, granule, or organic finish to fail. The roof typically evolves through natural oxidation: salmon-pink to russet bronze, then chocolate-brown CuO, and ultimately verdigris green-blue (brochantite, antlerite, posnjakite). Patina is copper's natural weathered surface; its rate and uniformity vary with environmental and atmospheric conditions and are not guaranteed.
UL 2218 Class 4 Impact / 120 mph Wind
Solid Copper Cedar Shingle 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 shingles split, crack, and lift under the same impact and wind exposures.
Explore now >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. No fluoropolymers, no plasticizers, no organic binders.
Explore now >Lifetime Transferable Warranty
Backed by the Interlock® Lifetime Transferable Warranty — applied to a material whose verifiable service life, documented across centuries of colonial, civic, and heritage residential applications, makes solid copper the most defensible long-term roofing investment.
Explore now >AAMA 2605 Certified Coating System
Why Solid Copper Roofing Outperforms Every Alternative
Interlock Copper Roofing panels are crafted from solid, unalloyed architectural copper — one of the oldest and most revered roofing materials in recorded history. Unlike aluminum or steel roofing systems, copper requires no applied coating system. Its protection is inherent to the material itself. Available in 16 oz and 20 oz gauges, Interlock copper panels arrive in their characteristic bright warm tone and develop a living verdigris patina over 30 to 35 years of natural weathering. That patina is not deterioration — it is copper’s permanent corrosion barrier, forming a stable protective layer that actively resists moisture, UV radiation, and environmental degradation for centuries. A certified Green Roofing Product and infinitely recyclable, copper carries an inherent Class A fire rating with no chemical treatment required.
Layer 1 — Natural Copper Surface
The outermost surface of every Interlock Copper panel is the copper itself — solid architectural copper with no synthetic coating applied. Unlike PVDF-coated aluminum systems, copper does not require a factory finish. Its natural surface begins forming a stable copper oxide layer within months of installation, progressing over 30 to 35 years to the characteristic verdigris patina recognized as the hallmark of permanent architectural copper worldwide.
Layer 2 — Natural Oxide Formation
Within months of installation, atmospheric oxygen reacts with the copper surface to form copper oxide — a tightly bonded, self-limiting layer that serves as copper’s primary corrosion barrier. Unlike rust on ferrous metals, copper oxide is stable and protective, not destructive. This layer requires no applied primer or factory treatment — it is the natural electrochemical behavior of the material.
Layer 3 — Carbonate Patina Development
Over years of exposure to atmospheric moisture and CO₂, the copper oxide layer continues to evolve into copper carbonate compounds — the source of the distinctive blue-green verdigris patina. This patina layer is chemically stable, self-sealing, and has been documented to provide continuous corrosion protection for centuries on landmark buildings worldwide. It requires no maintenance, no reapplication, and no chemical treatment.
Layer 4 — Mill Precision Finishing
Before forming, each Interlock copper panel is sourced from mill-finished architectural copper sheet — produced to tight dimensional tolerances with a clean, consistent surface free from surface defects. Mill quality directly determines the uniformity of patina development across the installed roof surface. Interlock specifies architectural-grade copper to ensure even, aesthetically consistent weathering across every panel.
Layer 5 — Solid Copper Substrate
The structural foundation of every Interlock Copper panel is solid architectural copper — available in 16 oz (~100 lbs per square) and 20 oz (~125 lbs per square) gauges. Copper is a naturally pure, non-ferrous metal with inherent corrosion resistance, thermal stability, and structural integrity that requires no alloying additives or synthetic reinforcement. Its performance has been validated across centuries of architectural roofing applications on some of the world’s most recognized structures.
Layer 6 — Natural Rear Surface
Interlock Copper panels require no synthetic back coat. Solid copper is inherently non-reactive, non-ferrous, and corrosion-resistant on all exposed surfaces — including the underside. The natural copper rear face provides the same material integrity as the exterior surface, with no risk of galvanic corrosion, moisture infiltration, or coating delamination.
Industry Expert Testimonial
Why a 48-Year Metal Roofing Coatings Veteran Endorses Interlock®
“In my 48 years of experience in the metal roofing industry (21 years with Desoto, 10 years with Morton International, 6 years with BASF and 10 years with 3M), it is most unique to find a company who is constantly striving to provide roofing products that live up to claims that are being made to customers. From the very moment the Interlock Roofing System is applied to a home the customer experiences excellent installation and a very unique surface design all applied to the finest metal available. All these are provided with the promise of great durability and sustainability and a low maintenance roofing system. The use of Alunar(r) Coating Systems, which have a superior record of color fastness, chalk resistance and literal fusion like adhesion is the finest coating system anyone can provide.”
Robert Scichili
Robert Scichili Associates, Inc.
Independent testimonial from an industry expert. Robert Scichili is President of Robert Scichili Associates, Inc. (Richardson, TX) and Principal Partner at RSK Avanti Partners LLC — a strategic marketing, sales, and technical development consultancy for the metal construction and architectural coatings industries. He previously served as Business Development Manager for the Industrial Coatings Division at BASF Corporation, where he led market positioning for the Ultra-Cool reflective coatings line. Robert is a founding Board Member of the Cool Metal Roofing Coalition and a published authority on Energy Star, LEED, and cool metal roofing technologies. His 48-year career in industrial coatings spans Desoto, Morton International, BASF, and 3M.
Robert Scichili · President, Robert Scichili Associates, Inc. · 21 years Desoto · 10 years Morton International · 6 years BASF · 10 years 3M
Technical Data
Product Specifications
| Specification | Details |
|---|---|
| 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 | ~100 lbs per 100 sq ft (16 oz copper) or ~125 lbs per 100 sq ft (20 oz copper) — structural assessment recommended for retrofit applications |
| 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 naturally tarnishes and develops a multi-stage atmospheric patina (cuprite Cu₂O → tenorite CuO → verdigris [brochantite, antlerite, posnjakite]); the rate and uniformity of patina formation vary with environmental and atmospheric conditions and are not guaranteed |
| Panel Size, Weather Exposure & Coverage Geometry | Matches Interlock® Metal Cedar Shingle panel geometry for design continuity with the aluminum line. Contact your local Interlock dealer for current cedar shingle profile dimensions and exposure details |
| 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 Cedar Shingle 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 colonial and ecclesiastical architecture across North America and Europe in continuous service for more than three centuries. New Interlock® Solid Copper Cedar Shingle 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 Cedar Shingle vs. Real Cedar Shingles vs. Asphalt Shingles
How does Interlock® Solid Copper Cedar Shingle compare to real cedar shingles and the alternatives a homeowner typically considers for Colonial, Craftsman, and traditional residential architecture? The numbers tell a clear story about service life, fire safety, rot resistance, and lifetime financial logic.
| Interlock® Solid Copper Cedar Shingle | Real Cedar Shingles | Asphalt Shingles | |
|---|---|---|---|
| Lifespan | 100-200+ years (documented) | 20-40 years (rot, split, mold) | 15-25 years |
| Weight | ~100-125 lbs/square (16 oz / 20 oz) | 150-200 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.
- 100% recyclable copper — zero landfill waste at end of life
- Copper patina is a natural, non-toxic surface process
- 100% recyclable at end of life
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.
★★★★★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.
★★★★★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!
FAQ
Frequently Asked Questions About Solid Copper Cedar Shingle Roofing
Common questions about Interlock® Solid Copper Cedar Shingle Roofing — covering material specifications, patina evolution, installation considerations, and how solid copper compares to real cedar shingles for Colonial, Craftsman, Cape Cod, and traditional residential architecture.
What is Interlock® Solid Copper Cedar Shingle Roofing?
Interlock® Solid Copper Cedar Shingle Roofing is the texture and silhouette of split cedar shingle executed in 99.9% pure electrolytic tough-pitch copper (Copper Alloy C11000) conforming to ASTM B370. Panel geometry matches the aluminum Metal Cedar Shingle profile on the four-way interlocking concealed-fastener system. The substrate is solid copper, not coated aluminum or copper-plated steel. Service life is measured in centuries rather than the 20–40 years of real cedar, and every panel is backed by the Interlock® Lifetime Transferable Warranty.
Does copper cedar shingle really look like real cedar from the ground?
Yes. The panel is roll-formed to reproduce the split-face texture, edge geometry, and shadow lines of split cedar shingle at a scale designed to read authentically from typical viewing distances (street level, neighboring property, drive-up approach). Where the difference becomes visible is on close inspection — cedar has natural grain figure that copper does not, and copper develops its patina rather than weathering to silver-grey. Most homeowners, neighbors, and review boards rate the architectural read as authentic to cedar; the inspection-distance differences become an advantage as copper develops its distinctive patina over time.
How does copper cedar shingle solve the cedar fire-risk problem?
Real cedar shingle is Class C untreated under ASTM E108 fire testing — a defining liability in wildfire-zone counties across California, Colorado, Texas Hill Country, the Carolinas, and increasingly the Pacific Northwest. Solid copper is inherently non-combustible per ASTM E136 (melting point 1,984°F), achieving Class A by virtue of the material itself rather than an underlayment-dependent assembly. Many California wildfire-zone counties no longer permit new untreated cedar installations; solid copper cedar shingle is the architectural-equivalent specification that meets code.
Will my Colonial or Craftsman home look right with copper instead of cedar?
Yes — copper is historically associated with the same architectural lineage as cedar shingle. Colonial-era civic, ecclesiastical, and high-end residential buildings frequently used copper roofing alongside cedar siding, and the verdigris patina is closely associated with traditional New England and Mid-Atlantic architectural vocabulary. Homes that read as Colonial, Craftsman, Cape Cod, Saltbox, or Foursquare style accept copper cedar shingle without aesthetic compromise; the only practical difference is that copper develops the patina (rather than weathering to silver-grey) over decades.
How long does copper cedar shingle last vs. real cedar shingles?
Real cedar shingle lasts 20–40 years before requiring replacement due to rot, splitting, moss/mold colonization, and (in fire-zone climates) ember-ignition vulnerability. Solid copper cedar shingle is documented at 100–200+ years of continuous service. Over a 50-year ownership window, a real cedar 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.
Does copper cedar shingle require the same maintenance as real cedar (oiling, treating)?
No. Real cedar shingle requires periodic oiling, fungicide treatment, moss removal, and individual shingle replacement to manage rot and splitting over its service life — a recurring maintenance budget item. Solid copper has no equivalent maintenance requirements: the patina is copper's natural weathered surface, not a coating that requires renewal. Annual debris removal from valleys and gutters is the only routine attention required. Copper cedar shingle is essentially maintenance-free across its multi-century service life.
Will the verdigris patina look right on a Colonial-style home?
Yes — verdigris is historically associated with Colonial-era civic architecture across New England and the Mid-Atlantic, and patinated copper is widely considered architecturally appropriate for Colonial, Federal, Georgian, and Cape Cod styles. Heritage preservation authorities and historic-district review boards routinely approve copper roofing on period-appropriate Colonial homes. For projects requiring a specific patina stage at completion (matched to existing adjacent copper, or specified at design review), Interlock-certified installers can apply professional patina-accelerant solutions.
Can copper cedar shingle be installed over existing cedar shingles?
Generally no — existing cedar shingles deteriorate underneath and create an unstable substrate for the underlayment and fastening system. Best practice is full tear-off and deck assessment before solid copper installation. The light installed weight of copper cedar shingle (~100–125 lbs/sq) means structural reinforcement is rarely required after tear-off, even when transitioning from cedar to copper. Your local Interlock dealer will perform a deck and structural assessment as part of the project specification.
How does cost compare to real cedar over a 50-year window?
Copper cedar shingle is the lower-cost option over a 50-year ownership window once recurring cedar costs are factored in. Real cedar shingle requires periodic chemical treatment (every 3–7 years), individual shingle replacement as splits develop, full re-roofing every 20–40 years, and — in fire-zone retrofits — mandatory replacement with non-combustible material at point of sale in some jurisdictions. Solid copper is installed once. The 50-year total cost of ownership reliably favors copper across published comparisons by the Copper Development Association and independent roofing-industry analyses.
Is copper cedar shingle code-approved in wildfire-zone counties?
Yes. Solid copper is inherently non-combustible per ASTM E136 (melting point 1,984°F), achieving Class A fire classification under ASTM E108 / UL 790. This satisfies wildfire-zone roofing requirements under the International Wildland-Urban Interface Code (IWUIC) and California Chapter 7A, where untreated cedar shingle is increasingly prohibited or restricted. Specify under CSI MasterFormat 07 41 13 and reference the Interlock® copper material specification (C11000, ASTM B370) on submittal documents.
At a Glance
Key Takeaways
- Cedar shingle architectural language in solid copper — no rot, no splitting, no mold, no Class C fire risk.
- Copper Alloy C11000 per ASTM B370; supplied in 16 oz or 20 oz architectural sheet.
- Installed weight ~100–125 lbs/sq vs real cedar's 150–200 lbs/sq waterlogged weight.
- Inherent Class A fire per ASTM E136 — meets California Chapter 7A and International Wildland-Urban Interface Code (IWUIC) requirements where untreated cedar is prohibited.
- Documented service life 100–200+ years vs real cedar's 20–40 years (rot, split, mold, ember-ignition).
- UL 2218 Class 4 hail; ASTM E1592 wind-uplift; 120 mph warranted; concealed-fastener four-way interlocking installation.
- Patina evolution (salmon-pink → bronze → verdigris) is architecturally compatible with Colonial / Federal / Georgian / Cape Cod styles.
| 100+ YEAR documented service life | INHERENT Class A fire (vs cedar Class C) | C11000 / ASTM B370 architectural copper | IWUIC + CA Chapter 7A compliant |
Documentation
Downloads & Specification Resources
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Get Started
Free, No-Obligation Interlock® Consultation
Every Interlock® consultation is free and carries no obligation — for homeowners, architects, and roofing contractors alike. Contact Interlock and a certified local sales representative from your exclusive Interlock® dealer will reach out to schedule a Zoom call, office meeting, or in-home consultation. The conversation walks through profile selection, technical installation requirements (slope, venting, underlayment, fasteners, trim, snow management, solar), and project-specific pricing — in that order, never the reverse.
For homeowners →
Review profile options, color samples, and the Guardian Lifetime Transferable Warranty applied to your specific home.
For architects →
Walk through CSI MasterFormat 07 31 16 / 07 41 13 specifications, ICC-ES ESR-1790 documentation, and assembly options for your project submittal.
For roofing contractors →
Discuss certified-installer territory, training, technical support, and warranty registration through the Interlock® dealer network.
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A specialist will match you with your local certified Interlock® installer.