Interlock® Knowledge Base
Straight answers about metal roofing, from the people who make it.
Search a question, follow the path that matches where you are in your decision, or talk to a specialist. For definitions, see the Glossary.
People ask:
Follow a path
Where are you in your roof decision?
Five stages, in the order homeowners actually ask. Pick yours and start with the six guides that matter most right now.
Stage 1
Is a metal roof right for my home?
Start with how metal roofs work, how long they last, and the honest trade-offs.
Compare every roof profile →- Pros and Cons of Metal RoofsThe pros of a metal roof: it lasts 50+ years, resists fire, hail, and wind, reflects heat to save energy, is lightweight and recyclable…Read the guide →
- How Long Does a Metal Roof Last?A quality metal roof lasts 40 to 70+ years, and often a lifetime — far longer than asphalt shingles at 15 to 30 years.Read the guide →
- Metal Roofing Myths, DebunkedThe most common metal roofing myths are false: they are not noisy (about as quiet as asphalt over a proper deck), do not attract lightning…Read the guide →
- Metal Roofing Problems: What Actually Happens Over 20 YearsMetal roofing’s real failure modes are well understood: oil canning on wide flat panels, gasket wear on exposed fasteners, galvanic…Read the guide →
- What Are Aluminum Shingles? A Complete GuideAluminum shingles are individual, interlocking metal roofing panels stamped from aluminum to look like slate, cedar shake, or dimensional…Read the guide →
- Are Metal Roofs Loud When It Rains?No. A modern interlocking metal roof installed over a solid roof deck and underlayment is about as quiet as an asphalt roof in the rain —…Read the guide →
Stage 2
Which material and style fits my home?
Side-by-side comparisons against steel, slate, cedar, tile and asphalt.
Browse the color guide →- Aluminum vs. Steel Roofing: Which Is Better?Both are excellent, but they differ in one decisive way: aluminum cannot rust because it contains no iron, while steel relies on a…Read the guide →
- Standing Seam vs. Metal Shingles: Which Is Right for You?Both are premium metal roofs; the choice is mostly aesthetic and architectural.Read the guide →
- Metal Slate Roof vs. Real Slate: Cost, Weight & LifespanA metal slate roof gives the slate look at a fraction of natural slate's cost and weight, with better impact resistance and easier…Read the guide →
- Metal Roof vs. Cedar Shake: Looks Without the UpkeepMetal shake gives the look of hand-split cedar without the maintenance or risk.Read the guide →
- How to Choose the Right Metal Roof Style for Your HomeMatch the profile to your home's architecture: Slate and Cedar Shingle suit traditional and craftsman homes, Shake gives a rustic cabin…Read the guide →
- Metal Roof Colors & Coatings: How to ChooseMetal roof color affects both looks and energy. 84 thermal emissivity.Read the guide →
Stage 3
What will it cost — and is it worth it?
Price ranges, lifetime cost, insurance, resale, financing and incentives.
Run the roof cost calculator →- How Much Does an Aluminum Metal Roof Cost? (2026)A metal roof typically costs $5 to $16 per square foot installed, or roughly $10,000 to $40,000 for an average home.Read the guide →
- Is a Metal Roof Worth It? A 50-Year Cost-of-Ownership LookYes, for most homeowners who plan to stay in their home. A metal roof costs more upfront but lasts 50+ years versus 15–30 for asphalt, so…Read the guide →
- Do Metal Roofs Lower Home Insurance?Often, yes. Because impact- and fire-resistant roofs generate fewer claims, many insurers offer a premium discount for them — commonly in…Read the guide →
- Do Metal Roofs Increase Home Resale Value?Yes. Metal roofs recoup roughly 60–70% of their cost in added home value and, because they are a lifetime, transferable-warranty roof…Read the guide →
- How to Finance a Metal RoofCommon ways to finance a metal roof include contractor or manufacturer financing plans, home-improvement loans, a home equity loan or…Read the guide →
- Metal Roofing Tax Credits & Incentives (2026)As of 2026, the roof itself does not qualify for a federal tax credit — the Energy Efficient Home Improvement Credit (Section 25C) expired…Read the guide →
Stage 4
Who installs it, and what happens?
Choosing a contractor, overlay vs. tear-off, and what the install week looks like.
Find an installer →- How to Choose a Metal Roofing ContractorChoose a contractor with specific metal-roofing experience — not just general roofing.Read the guide →
- Can You Install a Metal Roof Over Existing Shingles?In many cases, yes. Metal roofing is light enough to install over one existing layer of asphalt shingles where local codes allow, which…Read the guide →
- Tear-Off vs. Overlay: Do You Need to Remove Your Old Roof?A tear-off removes the old roof down to the deck; an overlay installs the new roof over the existing one.Read the guide →
- What to Expect During a Metal Roof InstallationA metal roof installation typically takes a few days to about a week and follows a clear sequence: inspection and measurement, material…Read the guide →
- Best Time of Year to Replace a RoofFall is generally the best time to replace a roof — mild, dry, stable weather is ideal for installation, and you are sealed up before…Read the guide →
- Roof Deck, Underlayment & Ventilation for Metal RoofsUnder the metal, three things matter: a sound roof deck (minimum 1/2-inch solid sheathing), a quality synthetic underlayment covering the…Read the guide →
Stage 5
Living with your roof for decades
Care, warranty, troubleshooting and what to do when you sell.
Read the Guardian warranty →- Do Metal Roofs Need Maintenance? A Homeowner's Care GuideVery little. A quality aluminum metal roof needs no routine coating, sealing, or repainting — just occasional common-sense care: keep…Read the guide →
- How to Clean a Metal Roof (Safely, From the Ground)Clean a metal roof from the ground whenever possible: rinse with a garden hose, apply a well-diluted, non-abrasive detergent with a…Read the guide →
- The Guardian Warranty: What Interlock's Lifetime Roof Warranty CoversInterlock's Guardian Warranty is a lifetime limited material warranty.Read the guide →
- How to Transfer a Roofing Warranty When You Sell Your HomeSome roofing warranties transfer to a new homeowner and some do not — the certificate's transfer clause decides.Read the guide →
- Condensation vs. Roof Leak: Diagnosing Attic MoistureAttic moisture under a metal roof is usually condensation, not a leak.Read the guide →
- Metal Roof Scratches, Dents & Touch-Ups: What to KnowMinor surface scratches and small dents are cosmetic and do not affect a metal roof's performance or watertightness — and they are…Read the guide →
Start here
The three guides every homeowner reads first
How Much Does an Aluminum Metal Roof Cost? (2026)A metal roof typically costs $5 to $16 per square foot installed, or roughly $10,000 to $40,000 for an average home.Pros and Cons of Metal RoofsThe pros of a metal roof: it lasts 50+ years, resists fire, hail, and wind, reflects heat to save energy, is lightweight and recyclable, and can…Metal Roofing Problems: What Actually Happens Over 20 YearsMetal roofing’s real failure modes are well understood: oil canning on wide flat panels, gasket wear on exposed fasteners, galvanic corrosion from…
Built for your weather
What’s your roof up against?
By region: Florida · Texas · Pacific Northwest
- HailShingle profiles tested to UL 2218 Class 4, the highest impact class
- WildfireNon-combustible metal in Class A fire-rated assemblies
- Snow & iceSheds snow and reduces ice dams
- Hurricane & windWarranted to 120 mph wind
- Coastal salt airAluminum contains no iron, so it can’t rust
- Heat & sunCool-roof finish reflects solar heat
Browse every topic
All 122 guides, in 8 topics
Metal Roofing Basics25 guides
Costs & Value11 guides
Choosing a Roof25 guides
Weather, Climate & Performance22 guides
Certifications & Testing6 guides
Installation & What to Expect11 guides
Care, Maintenance & Troubleshooting12 guides
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Guides cover the general case. A specialist can look at your home, your climate and your budget.