Metal Roofing Products

Interlock® Metal Roofing: Premium Aluminum & Copper Systems, Built to Last a Lifetime

Name: Metal Roofing
Brand: Interlock®
Rating: 4.9 (1847 reviews)

From architectural standing seam to hand-split shake texture, Interlock metal roofing is engineered in aluminum — and available in copper — with a Lifetime Transferable Warranty and zero-maintenance performance.

Discover Interlock Metal Roofing — the last roof you'll ever need, backed by the strongest warranty in the industry.

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Metal Roofing | Aluminum & Copper Systems · Lifetime Warranty | Interlock Roofing

Overview

What Is Metal Roofing?

Metal roofing is the fastest-growing roofing category in North America — and for good reason. Unlike asphalt shingles that require replacement every 15–20 years, metal roofing is engineered to outlast the structure it protects. Interlock® metal roofing is available in a range of architectural profiles — Shake, Slate, Mediterranean Tile, Standing Seam, and Cedar Shingle — each precision-formed from premium aluminum alloy and finished with the proprietary Alunar® 5-layer fluorocarbon coating system. For clients requiring maximum natural prestige, Interlock also offers select profiles in pure copper, the most storied roofing metal in architectural history.

At the core of every Interlock aluminum panel is a 0.028" alloy substrate — heavier gauge than most competing metal shingle products. The Alunar® coating bonds permanently to the metal surface through a 5-stage factory application process, delivering fade resistance, chalk resistance, and color retention verified to AAMA 2605 standards. At approximately 45–58 lbs per roofing square (depending on profile), Interlock aluminum panels install at less than 30% the weight of asphalt shingles and less than 7% of concrete tile, eliminating structural reinforcement requirements on virtually all residential frame construction. Every system is rated Class 4 under UL 2218, Class A under ASTM E108, and carries ICC-ES ESR-1790 approval — the most rigorous third-party evaluation available in North American roofing.

The economics of metal roofing have shifted decisively in recent years. As asphalt shingle costs climbed sharply post-2020, the total lifetime cost advantage of aluminum metal roofing has become undeniable. A homeowner who installs Interlock today eliminates two or three future asphalt replacements — each carrying full tear-off, disposal, and installation costs. Factor in the insurance premium reductions available in most markets for Class 4 hail-rated roofing, the measurable energy savings from solar-reflective Alunar® coatings, and the significant boost in home resale value associated with a lifetime warranted roof, and the ROI calculus is clear. Metal roofing isn't a premium — it's a financial strategy.

Who It's For

Metal Roofing for Every Stakeholder

If you've replaced an asphalt roof once, you already understand the pain: disruption, cost, landfill waste, and the nagging knowledge that you'll do it all again in 15 years. Interlock aluminum metal roofing ends that cycle permanently. Our Guardian Lifetime Transferable Warranty means your investment is protected for the life of your home — and can be transferred one time to the next owner (a $300 transfer fee applies), making it a genuine selling advantage when you list. With Class 4 hail protection, Class A fire resistance, and wind uplift resistance to 120 mph, Interlock is built for the climate reality of the 2020s and beyond.

Interlock Metal Roofing carries ICC-ES ESR-1790 — a code-compliance evaluation report that simplifies municipal permit approval in virtually every North American jurisdiction. Profiles are available in both aluminum and copper, enabling material continuity across low-slope accents, vertical cladding, and primary roof plane. Alunar® PVDF coatings comply with AAMA 2605, with spectral reflectance data available for energy modeling under ASHRAE 90.1. Full DWG/PDF technical drawings, cut sheets, and CSI MasterFormat specifications (Section 07 61 00) are available through the Interlock Architect Resource Center.

Interlock metal roofing panels are engineered for efficient installation on slopes of 3:12 or greater with ½" minimum sheathing and synthetic underlayment. The integrated clip-fastening system eliminates exposed fasteners and accommodates thermal expansion across all climate zones without field modification. A complete color-matched trim suite — ridge caps, hip caps, rakes, eaves, valleys, and step flashings — requires no field-fabricated flashing at any transition. Installation training and dealer certification is available through Interlock's North American dealer network.

KEY ADVANTAGES

6 Reasons Metal Roofing Outperforms Every Alternative

Lifetime Performance — Zero Replacements Required

Every Interlock installation is backed by a Lifetime Transferable Warranty — the strongest warranty in the roofing industry. Coverage can be transferred one time to the next owner (a $300 transfer fee applies), adding documented value at resale.

Class 4 Hail Resistance — The Highest UL Rating Available

Interlock aluminum panels are independently tested and rated Class 4 under UL 2218, the insurance industry’s top hail-resistance classification. A 2″ steel ball dropped from 20 feet produces zero visible damage. In most U.S. states, Class 4 certification qualifies homeowners for insurance premium discounts of 20–35% — a recurring financial benefit that compounds over the lifetime of the roof.

Class A Fire Rating — Maximum Code Protection

Metal does not combust. Interlock roofing systems carry a Class A fire rating under ASTM E108 — the highest classification in the International Building Code — protecting homes from both external ember exposure and surface flame spread. In wildland-urban interface (WUI) zones and HOA communities requiring fire-resistant roofing, Interlock is a compliant-by-specification solution.

Alunar® Coating System — Color That Lasts Decades

Interlock’s proprietary Alunar® 5-layer PVDF fluorocarbon coating is factory-applied in controlled conditions, chemically bonded to the aluminum substrate through a multi-stage process. Verified to AAMA 2605 — the most rigorous coating standard in the architectural metals industry — Alunar is backed by a 30-year coating warranty (no chalk >8 per ASTM D-4214; no fade >5 ΔE per ASTM D-2244) and full UV protection. The result: colors that look installed, not weathered, for decades.

Lightweight — No Structural Reinforcement Required

At 45–58 lbs per roofing square, Interlock aluminum panels weigh less than one-third of asphalt shingles and less than 7% of concrete tile. In most residential applications, this means direct installation over existing decking without structural engineering review or framing reinforcement — reducing installation complexity, project timelines, and total cost.

100% Recyclable — End-of-Life Value, Not Landfill Cost

Aluminum is the most recycled metal on earth. An Interlock aluminum roof that is someday removed carries positive scrap value rather than disposal cost. Combined with the elimination of two or three asphalt shingle replacement cycles — each generating 2–4 tons of landfill waste — Interlock metal roofing provides a measurably lower lifetime environmental footprint than any asphalt or concrete alternative.

AAMA 2605 Certified Coating System

The Alunar® 5-Layer Coating System: Science Behind the Lifetime Color

Every Interlock aluminum metal roofing panel — across every profile and every color — is finished with the proprietary Alunar® coating system. Developed specifically for exterior architectural aluminum, Alunar is a 5-layer factory-applied system that permanently bonds PVDF fluorocarbon resin to the aluminum substrate. The result is a finish that meets AAMA 2605 — the most demanding specification for architectural aluminum coatings — and is warranted against chalk and fade for 30 years.

Layer 1: Aluminum Substrate

Premium aluminum alloy — 0.028″ 3000-series for Shake, Mediterranean Tile, and Standing Seam profiles; 0.019″ 3105-H24 for Slate and Cedar Shingle profiles. All substrates are corrosion-resistant, 100% recyclable, and galvanically compatible with all standard roofing metals including copper flashings and copper accent panels.

Layer 2: Chemical Pre-Treatment

A controlled acid-wash and conversion-coat process removes surface oxides and deposits a micro-crystalline conversion layer that maximizes coating adhesion at the molecular level. This critical step is where most coating failures originate — Interlock’s factory process never shortcuts it.

Layer 3: Corrosion-Inhibiting Primer

High-build corrosion-inhibiting primer is roller-applied in controlled factory conditions and oven-cured to the substrate. This layer provides the adhesion bridge between metal and topcoat and delivers secondary corrosion resistance even if the topcoat sustains a scratch or edge exposure.

Layer 4: PVDF Topcoat (Alunar® Fluorocarbon)

70% PVDF resin topcoat is applied to a minimum 1.0 mil DFT and oven-cured at controlled temperature. PVDF fluorocarbon is the gold standard of architectural coatings — used on curtain walls, storefronts, and premium roofing worldwide — for its unmatched UV resistance, chalk resistance, and fade resistance. Verified to AAMA 2605.

Layer 5: UV-Transparent Clear Overcoat

A UV-transparent clear coat is applied over the color layer to increase surface hardness, add chalk and fade protection, and extend the effective service life of the topcoat system. The clear coat also enhances color depth and architectural finish quality.

Layer 6: Reverse-Side Wash Coat

The back face of each panel receives a protective wash coat that prevents moisture-driven oxidation from the underside — a common long-term failure mode on lower-quality coated metal panels that lack reverse-face protection.

Technical Data

Aluminum Metal Roofing: Technical Specifications

Specification	Details
Base Material & Alloy Specification	0.028" (28 mil) 3000-series aluminum alloy for Shake, Mediterranean Tile, and Standing Seam profiles; 0.019" 3105-H24 aluminum alloy for Slate and Cedar Shingle profiles — both gauges are heavier than or equal to most competitive metal shingle products
Panel Gauge & Nominal Base Thickness	3000-series aluminum alloy (Shake, Tile, Standing Seam) or 3105-H24 aluminum alloy (Slate, Cedar Shingle); all alloys are corrosion-resistant and galvanically compatible with all standard roofing metals; select profiles also available in pure copper
Coating System	Alunar® 5-layer PVDF fluorocarbon; AAMA 2605 certified; 30-year coating warranty (no chalk >8 per ASTM D-4214; no fade >5 ΔE per ASTM D-2244); full UV protection
Panel Weight	Approximately 45–58 lbs per roofing square (100 sq ft) depending on profile — less than 30% the weight of asphalt shingles; no structural reinforcement required on standard residential framing
Wind Resistance	Warranted to 120 mph; tested to ASTM D3161 Class F; integrated clip-fastening system accommodates full thermal expansion without exposed penetrating fasteners
Hail Rating	UL 2218 Class 4 (highest rating available); 2" steel ball impact at 20 ft drop; zero visible damage per standard test protocol
Fire Rating	Class A per ASTM E108 (highest rating available); protects against both external fire exposure and surface flame spread
Slope Requirement	Minimum 3:12 pitch; ½" minimum OSB or plywood sheathing; synthetic underlayment required over full deck
Code Compliance	ICC-ES ESR-1790; Florida Product Approval FL7263; compliant with IBC, IRC, and virtually all North American municipal building codes
Thermal Performance	Alunar® PVDF coating provides solar reflectance values meeting ASHRAE 90.1 and ENERGY STAR® criteria for steep-slope roofing products (select colors); low emittance for reduced cooling loads
Available Profiles	Metal Shake, Metal Slate, Mediterranean Tile, Standing Seam, Cedar Shingle (all in aluminum); copper available in select profiles for architectural accent applications
Trim System	Complete color-matched aluminum trim suite: ridge caps, hip caps, rake trim, eave trim, valley flashing, step flashing, counter flashing; no field fabrication required at any roof transition
Warranty	Guardian Lifetime Limited Non-Prorated Material Warranty; transferable one time to the next owner ($300 transfer fee); wind warranted to 120 mph

Available Colors

Metal Roofing Color Collection

Interlock metal roofing is available in a curated palette of low-gloss architectural colors, all finished with the Alunar® PVDF fluorocarbon system. Colors are consistent across all profiles — mix metal shake on the main field with standing seam on dormers, in the same color family, for complete design continuity.

Material Comparison

Metal Roofing vs. Other Roofing Materials: The Full Comparison

How does Interlock metal roofing compare to asphalt shingles, wood shake, concrete tile, and other options? The performance data and lifetime economics tell a definitive story.

Specification	Interlock Metal Roofing (Aluminum)	Asphalt Shingles	Concrete / Clay Tile
Lifespan	Lifetime — warranted for the life of your home	15–25 years (replacement cycle required)	30–50 years (with maintenance)
Hail Rating	UL 2218 Class 4 (maximum)	Class 1–3 (most products)	Varies; often fragile under large hail
Weight per Square	45–58 lbs — no structural reinforcement required	200–350 lbs	600–1,200 lbs — often requires structural upgrade
Maintenance Required	Zero — no caulking, painting, or granule-loss concerns	Annual inspection; moss growth; granule loss	Periodic resealing; cracked tile replacement
Environmental Impact	100% recyclable aluminum; eliminates repeat landfill cycles	2–4 tons landfill waste per replacement cycle	Heavy; energy-intensive manufacture; fragile units create jobsite waste

Environmental Performance

Metal Roofing & Sustainability: Built Green by Design

Interlock aluminum metal roofing is one of the most environmentally responsible roofing choices available. From the day it’s installed to the day it’s eventually recycled, every Interlock roof delivers a measurably lower environmental footprint than asphalt, wood, or concrete alternatives.

100% Recyclable — Aluminum retains positive scrap value at end of life. Zero landfill disposal cost.
Eliminates 2–4 tons of landfill waste per avoided asphalt shingle replacement cycle over a home's lifetime.
Solar-reflective Alunar® coatings (select colors) reduce urban heat island effect and can lower residential cooling loads by 10–25%.

Interlock metal roofing can contribute to LEED v4 certification under: MR Credit: Building Product Disclosure and Optimization (high recycled content); EA Credit: Optimize Energy Performance (reflective roofing); SS Credit: Heat Island Reduction (high solar reflectance index). Spectral reflectance data and recycled content documentation are available through your Interlock dealer.

Verified Customer Reviews

What Homeowners Are Saying About Interlock Metal Roofing

After our third hail-damaged asphalt roof in twelve years, our insurance company actually recommended metal roofing. We chose Interlock shake and haven't looked at another hail claim since. The 28% insurance premium discount alone pays for a significant portion of the upgrade — and the roof looks better than anything in the neighborhood.

Robert & Linda HarmonColorado

I was replacing the original 1940s slate on our heritage-designated home and needed something that would satisfy the heritage board visually while meeting current fire codes. Interlock aluminum slate was the only product that cleared both hurdles. Seven years in, it looks exactly as it did when it was installed.

Margaret SchultzBritish Columbia

We were primarily motivated by energy costs — our previous dark asphalt roof was cooking the house every summer. The Interlock standing seam in Classic White dropped our cooling load noticeably in the first season. The lifetime warranty and Class 4 hail rating were the bonuses that made it an easy decision.

David & Karen OkonkwoTexas

FAQ

Metal Roofing FAQs

Is metal roofing louder than asphalt during rain or hail?

No. When properly installed over solid decking — which Interlock requires — metal roofing is acoustically indistinguishable from asphalt shingles during rain. The combination of ½” minimum OSB sheathing, synthetic underlayment, and the panel’s gauge mass absorbs sound effectively. The ‘tin roof’ noise experience is specific to open-framing barn installations, not residential solid-deck applications.

Does metal roofing attract lightning?

Metal roofing does not increase lightning strike risk — lightning seeks the tallest object in a zone, regardless of material. In the rare event of a direct strike, metal roofing is non-combustible and will not catch fire, unlike asphalt or wood products. Many insurance carriers actually rate metal-roofed structures favorably for fire risk.

How much does metal roofing cost compared to asphalt shingles?

Interlock metal roofing carries a higher installed cost than entry-level asphalt — typically 2–4× the price of 3-tab asphalt on a per-square basis. However, when amortized over the lifetime of the roof — eliminating two or more future replacement cycles — the total cost of ownership is frequently lower. Class 4 hail insurance discounts (20–35% in most markets), increased home resale value, and energy savings further improve the economic case.

Can metal roofing be installed over existing asphalt shingles?

In many jurisdictions, Interlock metal roofing can be installed directly over one existing layer of asphalt shingles — subject to local building code confirmation, sheathing condition assessment, and installer evaluation. This eliminates tear-off cost and disposal fees. However, Interlock recommends full tear-off when sheathing is soft, when more than one existing layer is present, or when moisture intrusion is suspected.

What profiles are available in Interlock metal roofing?

Interlock offers five residential metal roofing profiles in aluminum: Metal Shake (hand-split wood shake texture), Metal Slate (quarried slate appearance), Mediterranean Tile (clay tile profile), Standing Seam (concealed-fastener architectural profile), and Cedar Shingle (sawn cedar shingle look). Select profiles are also available in copper for architectural accent applications.

Does metal roofing increase home resale value?

Yes, measurably. The Remodeling Cost vs. Value Report consistently shows metal roofing among the highest-ROI home improvement projects, with typical cost recoupment of 60–85% at resale. Beyond raw recoupment, a lifetime warranted metal roof is a documented selling point in real estate listings — particularly in hail-prone markets where buyers understand the replacement cost cycle of asphalt.

What is the difference between aluminum and copper metal roofing?

Aluminum represents 99%+ of Interlock’s residential volume and is the recommended choice for the vast majority of applications. It is corrosion-resistant, lightweight, and finished with the Alunar® PVDF coating system for long-term color performance. Copper is the traditional prestige roofing metal — naturally antimicrobial and self-finishing, developing its protective patina through progressive natural oxidation. Copper is typically specified for architectural accent areas — dormers, canopies, bay roofs — rather than full main-field application, due to its higher cost per square.

How long does a metal roofing installation take?

A typical residential installation of 20–35 roofing squares takes 2–4 days with a trained Interlock dealer crew. Larger or more complex homes — steep pitches, multiple dormers, complex hip and valley geometry — may require 5–7 days. Interlock’s complete color-matched trim system, which requires no field fabrication, significantly reduces installation time compared to systems requiring custom-bent trim at transitions.

Is metal roofing compatible with solar panels?

Yes. Interlock metal roofing is compatible with ballasted and penetrating-mount solar PV systems. Standing Seam profiles support clamp-based solar mounting that requires no roof penetrations. For shake, slate, and tile profiles, penetrating mounts with proper flashing are used. Interlock technical documentation includes solar attachment guidance, and your dealer can coordinate with solar installers for combined specifications.

What warranty covers Interlock metal roofing?

Interlock aluminum metal roofing is covered by the Guardian Lifetime Limited Non-Prorated Material Warranty — the strongest coverage in the residential roofing industry. It covers material defects and structural panel failure for the lifetime of the original owner’s home, with the Alunar® coating warranted 30 years against fade and chalk. Coverage can be transferred one time to the next owner for a $300 transfer fee. Wind resistance is warranted to 120 mph. Complete warranty terms are available through your Interlock dealer.

Profiles

Explore Other Interlock Roofing Profiles

Last modified: May 22, 2026 12:37 pm