Copper Roofing Systems
Interlock® Copper Standing Seam Roofing
Architectural-grade vertical-rib standing seam in 99.9% pure architectural copper — the industry-standard profile for contemporary residential, civic, ecclesiastical, and architectural commercial roofing. Backed by the Interlock® Lifetime Transferable Warranty.
Interlock® Copper Standing Seam Roofing is the architectural-grade vertical-rib standing seam profile executed in solid Copper Alloy C11000 (ASTM B370) — the same alloy and gauge specification used on civic, ecclesiastical, and monumental architecture across North America and Europe for more than two hundred years.
TL;DR Summary
Interlock® Copper Standing Seam Roofing is the architectural-grade vertical-rib standing seam profile executed in 99.9% pure architectural copper (C11000, ASTM B370). The dominant copper roofing typology for civic, ecclesiastical, and contemporary architectural applications. Mechanically seamed or snap-lock configurations; preferred substrate for clipmounted solar PV without seam penetration.
Overview
What Is Interlock® Copper Standing Seam Roofing?
Interlock® Copper Standing Seam Roofing is the architectural-grade vertical-rib standing seam profile, 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. Standing seam is the dominant copper roofing typology for civic, ecclesiastical, and architectural commercial applications worldwide; the vertical-rib geometry with hidden mechanical seams creates the cleanest, most contemporary copper roof expression available, with the same multi-century material performance as Interlock's other solid copper profiles.
Color is intrinsic to the metal — no PVDF coating, paint film, or applied finish to fail (unlike painted steel standing seam, where the Kynar/PVDF coating becomes the service-life-limiting component). Newly installed Copper Standing Seam 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 standing seam roofs on civic and ecclesiastical buildings across North America and Europe for more than two centuries.
Why Contemporary and Civic Architecture Specifies Copper Standing Seam
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), UL 2218 Class 4 impact resistance, ASTM E1592 wind-uplift performance, specified under CSI MasterFormat 07 41 13 (Metal Roof Panels), conforming to IBC §1507.4 and IRC §R905.10. Solar-array compatible (the contemporary standing seam typology is the preferred substrate for clip-mounted PV arrays), 100% recyclable at end of service, and backed by the Interlock® Lifetime Transferable Warranty.
Table of Contents
- What Is Interlock® Copper Standing Seam Roofing?
- Interlock® Copper Standing Seam for Architects, Specifiers, and Civic Projects
- The Interlock® Copper Standing Seam 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
- Copper Standing Seam vs. Painted Steel Standing Seam vs. Asphalt Shingles
- Sustainability & Energy Efficiency
- What Homeowners Say About Interlock Metal Roofing
- Frequently Asked Questions About Copper Standing Seam Roofing
- Key Takeaways
Who It's For
Interlock® Copper Standing Seam for Architects, Specifiers, and Civic Projects
You want the cleanest, most contemporary copper roof expression — the architectural standing seam profile that defines civic, modernist, and contemporary residential design — in a material that will outlast the structure. Interlock® Copper Standing Seam gives you the standing seam aesthetic of civic and ecclesiastical landmarks in a substrate engineered to develop a living patina rather than degrade. Solar-compatible, inherently fire-resistant, and backed by the Interlock® Lifetime Transferable Warranty applied to a material whose documented service life is multi-century.
Get Your Free Quote →Interlock® Copper Standing Seam 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. Vertical-rib standing seam geometry with mechanically seamed or snap-lock configurations available (specify project requirements). Performance: UL 790 Class A fire (inherent / non-combustible per ASTM E136), 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 and applicable Environmental Product Declarations. Solar PV clip-mount compatible without seam penetration. Full panel profile drawings, fastener schedules, and CSI-formatted submittal language available on request.
Download Spec Sheet →Interlock® Copper Standing Seam installs via mechanical seaming or snap-lock configurations (project-specified) with stainless steel fasteners throughout to prevent galvanic corrosion. The vertical-rib geometry is the preferred substrate for clip-mounted solar PV arrays — PV racking attaches at the seam without seam penetration, eliminating the warranty-voiding fastener penetration common to other roof types. Copper requires careful detailing for runoff management; 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® Copper Standing Seam Advantage
Multi-Century Service Life
Copper standing seam carries the only roofing service record measured in centuries rather than decades — the dominant typology on civic, ecclesiastical, and monumental architecture worldwide. The standing seam profile you specify today will be on the building in 2150.
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, applicable across civic, institutional, and high-end residential specifications where painted steel standing seam can only achieve Class A through assembly.
Explore now >Naturally Evolving Patina Finish
Color is intrinsic to copper — no Kynar/PVDF coating to fail (the service-life-limiting component of painted steel standing seam). 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.
Solar PV Compatible (Clip-Mount, No Penetration)
The standing seam vertical-rib geometry is the preferred substrate for clip-mounted solar PV arrays — PV racking attaches at the seam without seam penetration, eliminating warranty-voiding fastener penetrations that complicate solar retrofit on lower-profile roofing types. Combined with copper's multi-century service life, the roof outlasts every PV array generation it carries.
Explore now >UL 2218 Class 4 Impact / 120 mph Wind
Solid Copper Standing Seam 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 the mechanical strength of the standing seam joint.
Explore now >Lifetime Transferable Warranty
Backed by the Interlock® Lifetime Transferable Warranty — applied to a material whose verifiable service life, documented across more than two centuries of civic and ecclesiastical standing seam installations, makes solid copper the most defensible long-term roofing investment in the architectural standing seam category.
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 | ~100–125 lbs per 100 sq ft (16 oz or 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 | Vertical-rib standing seam panels; mechanically seamed or snap-lock configurations available (specify project requirements). Contact your local Interlock dealer for current panel widths, seam heights, and exposure |
| 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. Solar PV clip-mount compatible without seam penetration |
| CSI MasterFormat Division & Section Reference | 07 41 13 — Metal Roof Panels |
Available Colors
Patina Evolution — The Living Finish
Interlock® Copper Standing Seam 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 Kynar/PVDF coating, paint film, or organic binder to chalk, fade, peel, delaminate, or fail by UV exposure — a defining specification difference from painted steel standing seam, where the coating becomes the service-life-limiting component. What replaces a fixed color is a documented oxidation sequence — the same self-passivating chemistry that has preserved the standing seam cladding of the Statue of Liberty (1886), the U.S. Capitol Dome (1863), and copper standing seam roofs on civic, ecclesiastical, and monumental architecture across North America and Europe in continuous service for more than two centuries. New Interlock® Copper Standing Seam 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
Copper Standing Seam vs. Painted Steel Standing Seam vs. Asphalt Shingles
How does Interlock® Copper Standing Seam compare to painted steel standing seam and the alternatives a specifier typically considers for contemporary residential, civic, and architectural standing seam applications? The numbers tell a clear story about substrate longevity, coating risk, and lifetime financial logic.
| Interlock® Copper Standing Seam | Painted Steel Standing Seam | Asphalt Shingles | |
|---|---|---|---|
| Lifespan | 100-200+ years (documented) | 40-70 years (limited by PVDF coating) | 15-25 years |
| Weight | ~100-125 lbs/square (16 oz / 20 oz) | 100-150 lbs/square | 250-350 lbs/square |
| Fire Rating | Class A (inherent / non-combustible) | Class A (assembly) | Class A (with mat) |
| Warranty | Lifetime Transferable | 30-50 year limited (coating) | 20-30 year limited |
| Maintenance | Essentially maintenance-free (patina self-passivates) | Periodic inspection; coating chalking/fading after 20–30 yr | Periodic inspection, re-nailing |
Real Installations
Interlock® Copper Standing Seam — Project Gallery
Interlock® Copper Standing Seam installations across contemporary residential, civic, ecclesiastical, and architectural commercial projects. Each project shows a different stage of the natural patina — from bright copper at installation through the bronze and verdigris stages.
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 Copper Standing Seam Roofing
Common questions about Interlock® Copper Standing Seam Roofing — covering material specifications, patina evolution, solar PV integration, and how solid copper standing seam compares to painted steel standing seam for contemporary residential, civic, ecclesiastical, and architectural commercial applications.
What is Interlock® Copper Standing Seam Roofing?
Interlock® Copper Standing Seam Roofing is the architectural-grade vertical-rib standing seam profile executed in 99.9% pure electrolytic tough-pitch copper (Copper Alloy C11000) conforming to ASTM B370. Mechanically seamed or snap-lock configurations are available (specify per project). Standing seam is the dominant copper roofing typology for civic, ecclesiastical, and architectural commercial applications worldwide, and is the preferred substrate for clip-mounted solar PV arrays. Every panel is backed by the Interlock® Lifetime Transferable Warranty.
How does copper standing seam compare to painted steel standing seam (Kynar/PVDF)?
Painted steel standing seam (typically 24–26 gauge Galvalume substrate with Kynar 500 or Hylar 5000 PVDF coating) has a documented service life of 40–70 years — limited not by the steel substrate but by the eventual chalking, fading, and adhesion failure of the PVDF coating. Solid copper standing seam has no applied coating to fail — color is intrinsic to the metal, and service life is documented at 100–200+ years. The trade-off is upfront cost: painted steel is less expensive at installation; copper is the lower 50-year total-cost-of-ownership option.
Can solar panels be mounted on copper standing seam without penetrating the seams?
Yes — and this is one of copper standing seam's defining specification advantages. The vertical-rib geometry is the preferred substrate for clip-mounted solar PV racking (S-5!, SnapNrack, IronRidge, EcoFasten, and similar systems): clamps attach mechanically to the seam itself without penetrating the panel, eliminating fastener penetrations that void roofing warranties on lower-profile systems. Combined with copper's multi-century service life, the roof reliably outlasts every generation of PV array it carries — an important consideration for net-zero and sustainability-target projects.
Does copper standing seam require different installation than steel standing seam?
Yes — copper standing seam installation requires copper-specific detailing that steel standing seam does not. Critical differences: stainless steel fasteners throughout (galvanized or carbon steel fasteners cause galvanic corrosion at every contact point); managed runoff to prevent copper-salt staining of masonry, stucco, or limestone below; expansion-joint detailing tuned to copper's higher thermal expansion coefficient than steel; and incompatible-metal isolation at all interfaces with aluminum, zinc, and galvanized assemblies. Certified Interlock copper installers receive copper-specific training; this is not a category for unfamiliar installers.
How long does copper standing seam last vs. painted steel standing seam?
Painted steel standing seam: 40–70 years, with service life limited by the PVDF coating (the steel substrate itself lasts longer than the coating in most climates). Solid copper standing seam: 100–200+ years, with service life limited by no applied coating since none exists — the material itself is the protective system. Historic copper standing seam roofs on civic and ecclesiastical buildings across North America and Europe are documented in continuous service for more than two centuries.
Is copper standing seam noisier than steel in rain or hail?
No — and this is a common misconception about metal roofing generally. Interlock copper standing seam is installed over solid roof decking and standard underlayment, not over open purlins like agricultural barn roofs. Independent acoustic testing of decked metal roofing assemblies measures rain and hail noise within 1–3 decibels of asphalt shingle assemblies. With standard attic insulation, the interior is acoustically indistinguishable from a conventional shingle roof. Copper actually damps higher-frequency sound slightly better than thinner-gauge painted steel.
Will copper standing seam work for a contemporary residential project?
Yes — copper standing seam is among the most architecturally appropriate specifications for contemporary residential design. The clean vertical-rib geometry, hidden mechanical seams, and crisp panel lines complement modernist, contemporary, and architectural residential aesthetics. The natural patina evolution adds material depth that aluminum-and-paint products cannot match, and the multi-century service life aligns with sustainability-target projects (passive house, net-zero, LEED Platinum). Verdigris-stage copper is particularly identified with contemporary architectural commercial and civic projects.
What's the typical cost premium over painted steel standing seam?
Solid copper standing seam typically carries a 2–4× material cost premium over painted steel standing seam, depending on copper commodity pricing and gauge specification (16 oz vs 20 oz). Installation labor is comparable. The premium narrows over a 50-year ownership window once recurring re-coating, re-roofing, and warranty-expiration costs are factored in: painted steel typically requires re-coating or replacement at year 40–60; copper does not. Solid copper also retains substantial commodity salvage value at end of service that painted steel does not.
Can copper standing seam be specified for civic or institutional buildings?
Yes — solid copper standing seam is the historically dominant specification for civic, ecclesiastical, and institutional roofing. Specify under CSI MasterFormat 07 41 13 (Metal Roof Panels) with the Interlock® material specification (C11000, ASTM B370, 16 oz or 20 oz nominal). The specification accepts mechanically seamed or snap-lock configurations per project requirements. Performance: UL 790 Class A fire, UL 2218 Class 4 impact, ASTM E1592 wind-uplift, IBC §1507.4 / IRC §R905.10 conformance. Lifetime Transferable Warranty applies to public and institutional projects.
How does the patina look on a contemporary or modernist home?
The patina evolution is particularly architecturally compelling on contemporary and modernist residential design. The crisp salmon-pink and russet-bronze stages contrast sharply with concrete, stone, wood, and steel exterior materials that define modernist vocabulary, and the mature verdigris green-blue stage — the iconic copper patina — reads as architecturally precise and distinctive on contemporary buildings rather than historicizing. Many contemporary architects deliberately specify copper standing seam specifically *because* of the patina evolution, treating it as a material time-component of the building's expression.
At a Glance
Key Takeaways
- Copper Alloy C11000 per ASTM B370; 16 oz or 20 oz architectural sheet.
- Mechanically seamed or snap-lock configurations available per project specification.
- Installed weight ~100–125 lbs/sq; structural assessment recommended for retrofit.
- Preferred substrate for clip-mounted solar PV (S-5!, SnapNrack, IronRidge, EcoFasten) — no seam penetration, no warranty void.
- Inherent Class A fire per ASTM E136; UL 2218 Class 4 hail; ASTM E1592 wind-uplift; 120 mph warranted.
- 100–200+ year documented service life vs painted-steel standing seam's 40–70 yr (coating-limited).
- Stainless steel fasteners throughout; copper-specific detailing for runoff management; CSI MasterFormat 07 41 13.
| 100+ YEAR documented service life | SOLAR PV compatible (no seam penetration) | INHERENT Class A fire (ASTM E136) | C11000 / ASTM B370 specification |
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.