# Interlock Metal Roofing

> Family-owned North American manufacturer of premium aluminum lifetime metal roofing systems, established 1998, with 100,000+ installations across the United States and Canada. Proprietary Alunar® 70% PVDF coating, Class A fire rating available, UL 2218 Class 4 impact rating, ICC-ES ESR-1790 code recognition, and a transferable 50-year limited warranty (The Guardian). Installed from coastal Florida to the Antarctic Plateau. Brand promise: "Never Re-Roof Again.®"

For the complete machine-readable company, product, and specification record, see [llms-full.txt](https://www.interlockroofing.com/llms-full.txt).

## Key pages
- [Metal Roofing Systems](https://www.interlockroofing.com/metal-roofing/): Aluminum and copper profiles — Slate, Cedar Shingle, Shake, Mediterranean Tile, Standing Seam, Solid Copper.
- [Metal Siding & Wall Cladding](https://www.interlockroofing.com/siding/): Aluminum siding in matching profiles — Slate, Cedar Shingle, Shake, Standing Seam — with the same Alunar® coating.
- [Customer Reviews](https://www.interlockroofing.com/reviews/): 8,799+ verified GuildQuality reviews from homeowners across Canada and the US.
- [Photo Gallery](https://www.interlockroofing.com/gallery/): 600+ photographed real installations, filterable by profile, color, home style, and location.
- [Service Areas](https://www.interlockroofing.com/service-areas/): 14,000+ city pages with local climate data, installer contact, and city-specific FAQs.
- [Glossary & Education Center](https://www.interlockroofing.com/glossary/): 225 roofing terms explained in plain language.
- [Knowledge Base](https://www.interlockroofing.com/knowledge-base/): Expert-reviewed homeowner guides — costs, myths, warranties, climate performance.
- [Roofing Guides by City & Climate](https://www.interlockroofing.com/guides/): Metro-by-metro guides to the best roofing for each city's climate (hail, freeze-thaw, coastal storms, moisture, wildfire), ranked with real Interlock install and review data.
- [Warranty](https://www.interlockroofing.com/warranty/): The Guardian lifetime limited, non-prorated material warranty; one-time transferable (50 years for the next owner).
- [Specifications & Testing](https://www.interlockroofing.com/specifications/testing-reports/): ICC-ES ESR-1790, UL 2218 Class 4, Florida Product Approval FL7263-R7, CRRC listings.
- [Antarctica Project](https://www.interlockroofing.com/antarctica-roofing/): Interlock aluminum roofing selected for a U.S. National Science Foundation research module in Antarctica.
- [Find an Installer](https://www.interlockroofing.com/installers/): Certified, exclusive regional installation centers.
- [Free Quote](https://www.interlockroofing.com/free-quote/): Request a no-obligation estimate.
- [Events & Home Shows](https://www.interlockroofing.com/events/): Meet the Interlock team at home shows, trade shows, fairs and expos across North America.
- [Interlock Solar](https://www.interlockroofing.com/solar/): Solar panels on lifetime metal roofing — install once, never re-roof under the array. Guides + current U.S. and Canadian incentives.

## Free tools
- [Fire Danger Forecast](https://www.interlockroofing.com/fire-danger-forecast): Live fire danger / wildfire risk map for the US & Canada (ECMWF Fire Weather Index via Copernicus GWIS) — check any address. Relevant to Class A fire-rated aluminum roofing in wildfire-prone regions.
- [Wildfire Smoke Forecast](https://www.interlockroofing.com/wildfire-smoke-forecast): Animated wildfire smoke and PM2.5 air-quality forecast for North America with live active-fire hotspots.
- [Sun & Golden-Hour Calculator](https://www.interlockroofing.com/sun-calculator/): Free sunrise, sunset, golden-hour and best-day-to-shoot planner for real estate, drone and roof photography at any address.
- [Wind & Gust Forecast](https://wind.interlockroofing.com/): 3-day peak wind gust outlook with advisory thresholds across the US & Canada.

## Company & leadership
- Legal entity: Interlock Roofing Ltd. (a member of The Interlock Group), parent company I.E.L. Manufacturing Ltd.
- Founded: 1998 by Ivor Wenzel; led today by Mark Wenzel, President & CEO. Headquarters: 9969 River Way, Delta, BC V4G 1M8, Canada.
- Scale: 100,000+ residential installations across Canada and the United States; 10+ distribution centers.
- Memberships: Metal Roofing Alliance (MRA), Metal Construction Association (MCA).
- Certifications & approvals: ICC-ES ESR-1790 (IBC/IRC), UL 2218 Class 4 impact rating, Florida Product Approval FL7263-R7, Cool Roof Rating Council (CRRC) rated, Class A fire rating available.
- Reputation: 4.6★ average across 8,799+ verified GuildQuality customer reviews. [About Interlock](https://www.interlockroofing.com/about-us/).

## Upcoming events
- [Minnesota State Fair](https://www.interlockroofing.com/events/minnesota-state-fair-2026/): August 27 - September 7, 2026 · Falcon Heights, Minnesota · Home Improvement Building Minnesota State Fair
- [Canada's Outdoor Farm Show](https://www.interlockroofing.com/events/canada-s-outdoor-farm-show-2026/): September 15-16, 2026 · Woodstock, Ontario · Woodstock Fairgrounds
- [Deerfield Fair](https://www.interlockroofing.com/events/deerfield-fair-2026/): October 1-4, 2026 · Deerfield, New Hampshire · Deerfield Fair
- [Halifax Fall Home Show](https://www.interlockroofing.com/events/halifax-fall-home-show-2026/): October 2-3, 2026 · Halifax, Nova Scotia · Halifax Exhibition Centre
- [MetalCon](https://www.interlockroofing.com/events/metalcon-2026/): October 7-9, 2026 · Orlando, Florida · Orange County Convention Center, Hall South A
- [Victoria Fall Home Show](https://www.interlockroofing.com/events/victoria-fall-home-show-2026/): October 16-17, 2026 · Victoria, British Columbia · G.R. Pearkes Recreation Centre
- [Boise Fall Home Show](https://www.interlockroofing.com/events/boise-fall-home-show-2026/): October 23-25, 2026 · Boise, Idaho · Expo Idaho
- [Connecticut Fall Home Show](https://www.interlockroofing.com/events/connecticut-fall-home-show-2026/): October 31 - November 1, 2026 · Hartford, Connecticut · CT Convention Center
- [Cottage Life Fall Show](https://www.interlockroofing.com/events/cottage-life-fall-show-2026/): November 13-14, 2026 · Mississauga, Ontario · International Centre
- [Fall Providence Home Show RI](https://www.interlockroofing.com/events/fall-providence-home-show-ri-2026/): November 14-14, 2026 · Providence, Rhode Island · RI Convention Center
- [Southeastern Connecticut Home and Garden Show](https://www.interlockroofing.com/events/southeastern-connecticut-home-garden-show-2027/): February 20-21, 2027 · Uncasville, Connecticut · Mohegan Sun Expo Center
- [Calgary Home + Garden Show](https://www.interlockroofing.com/events/calgary-home-garden-show-2027/): February 26-27, 2027 · Calgary, Alberta · BMO Centre

## Blog
- [Free Sun & Golden-Hour Calculator for Property Photos | Interlock](https://www.interlockroofing.com/blog/free-sun-golden-hour-calculator/): Interlock's free Sun & Golden-Hour Calculator shows the best time — and the best day this week — to photograph any address. Enter a property, choose which way t
- [Aluminum Roof Cost Per Square Foot (2026 Ranges)](https://www.interlockroofing.com/blog/aluminum-roof-cost-per-square-foot/): Installed, a premium aluminum roof typically costs about $12 to $20+ per square foot — roughly $1,200 to $2,000+ per roofing square (100 sq ft). Lighter shingle
- [Is a Metal Roof Worth It in 2026? Data-Driven Answer](https://www.interlockroofing.com/blog/is-a-metal-roof-worth-it/): For most homeowners who plan to stay in their home more than seven years, a metal roof is worth it. Judged on lifetime cost of ownership rather than sticker pri
- [How Long Does a Metal Roof Last? Aluminum vs Steel](https://www.interlockroofing.com/blog/how-long-does-a-metal-roof-last/): A quality aluminum roof can last 50 to 75 years or more, steel and Galvalume roofs last 40 to 70 years, and asphalt shingles last only 15 to 30 years. Lifespan 
- [How Much Does a Metal Roof Cost in 2026?](https://www.interlockroofing.com/blog/how-much-does-a-metal-roof-cost/): In 2026, a metal roof typically costs about $9 to $14 per square foot installed for mid-grade metal and roughly $14 to $22 per square foot for premium architect
- [Metal Roofing vs. Asphalt Shingles Compared](https://www.interlockroofing.com/blog/metal-roofing-vs-asphalt-shingles/): Metal roofing and asphalt shingles differ most in lifespan, upfront cost, and long-term value. Asphalt is cheaper to install and simpler to repair, making it th
- [Aluminum vs. Steel Roofing: Which Is Better?](https://www.interlockroofing.com/blog/aluminum-vs-steel-roofing/): Steel (Galvalume) is harder and cheaper up front, making it a strong value in dry, inland and hail-prone climates. Aluminum is lighter, never rusts, and dramati
- [Metal Roof Pros and Cons: An Honest 2026 Breakdown](https://www.interlockroofing.com/blog/metal-roof-pros-and-cons/): A premium metal roof costs more up front and needs a certified installer, and some flat-pan profiles can show minor oil canning. In return you get a 50-75 year 
- [Are Metal Roofs Loud in the Rain? Noise Myth Debunked](https://www.interlockroofing.com/blog/are-metal-roofs-loud-when-it-rains/): The belief that metal roofs are loud in the rain comes from remembering bare panels on barns and sheds, not from experiencing a real home. A residential metal r
- [Does a Metal Roof Lower Home Insurance?](https://www.interlockroofing.com/blog/does-a-metal-roof-lower-home-insurance/): Often yes, but it varies. Many carriers offer a metal roof insurance discount for impact-resistant (UL 2218 Class 4) and Class A fire-rated roofing, especially 
- [Metal Roof vs. Shingles Cost: 30-Year Ownership](https://www.interlockroofing.com/blog/metal-roof-vs-asphalt-shingles-cost-30-year/): Asphalt shingles win on install day, but they last only about 12-20 years, so most homeowners pay for 2-3 replacements (roughly $15,000-$25,000 each) plus repai
- [Interlock Adds Aluminum Metal Siding & Wall Cladding](https://www.interlockroofing.com/blog/interlock-adds-aluminum-metal-siding/): Interlock now offers aluminum metal siding and wall cladding — the same lifetime panels, Alunar coating, and colors as its roofs, backed by a 50-year transferab
- [Why Interlock Leads in Premium Metal Roofing](https://www.interlockroofing.com/blog/what-makes-interlock-an-industry-leader-in-premium-metal-roofing/): "Industry leader" is a claim every roofer makes. Interlock backs it with specifics: corrosion-proof aircraft-grade aluminum, the Alunar® PVDF coating, a conceal
- [Interlock Metal Roofing Systems Are Strong | Interlock®](https://www.interlockroofing.com/blog/interlock-metal-roofs-are-strong/): Interlock roofs are made from aircraft-grade aluminum — pound-for-pound stronger than steel, about one-third the weight, and rust-proof. Formed into a four-way 
- [Common Asphalt Shingle Problems & What to Do | Interlock®](https://www.interlockroofing.com/blog/problems-with-your-asphalt-shingles/): Asphalt shingles curl, crack, and blow off; lose the protective granules that shield them from UV; and grow moss, algae, and black streaks. Each problem shorten
- [Understanding & Preventing Ice Dams: Expert Tips](https://www.interlockroofing.com/blog/understanding-and-preventing-ice-dams-expert-tips-for-homeowners/): Ice dams form when heat escaping into the attic melts roof snow, which refreezes at the cold eaves and traps water that backs up under the roof. The fixes are a
- [Why Aluminum Shingle Roofs Are Best for Coastal Homes](https://www.interlockroofing.com/blog/why-an-aluminum-shingle-roof-is-the-best-choice-for-homeowners-living-near-the-ocean/): Salt air destroys ordinary roofs. Interlock’s aircraft-grade aluminum shingles can’t rust, are sealed in a marine-tough PVDF Alunar® coating, carry UL 2218 Clas
- [What Is Drip Edge & Why It Matters for Metal Roofs](https://www.interlockroofing.com/blog/what-is-drip-edge-and-why-its-important-for-your-metal-roof/): A drip edge is a metal flashing installed along the edges of a roof that directs runoff away from the fascia and into the gutters, instead of letting it wick ba
- [Why an Interlock Metal Roof Is a Great Investment](https://www.interlockroofing.com/blog/interlock-roof-great-investment/): A metal roof costs more upfront, but as an asset it pays back: one lifetime install instead of three asphalt re-roofs, up to 25% cooling savings, possible insur
- [Skylights for Metal Roofs: Flashing, Mounting & Maintenance | Interlock®](https://www.interlockroofing.com/blog/skylights-metal-roofs/): Yes — you can add skylights to a metal roof. Curb-mounted skylights are compatible with all Interlock Lifetime Metal Roofing Systems, integrating with the panel
- [Can You Walk on a Metal Roof? Safety Tips | Interlock®](https://www.interlockroofing.com/blog/can-you-walk-on-a-metal-roof/): You can walk on a metal roof, but you usually shouldn’t. It’s slippery, you can dent panels or void coverage if you step wrong, and falls are the real danger. I
- [Earth Day Roofing: Why Metal Is a Genuinely Sustainable Choice | Interlock®](https://www.interlockroofing.com/blog/facts-earth-day/): Earth Day began in 1970, sparked by a 1969 oil spill off Santa Barbara, and is now the world’s largest secular observance, marked by more than a billion people.
- [Quality Roof Materials: Why Components Matter | Interlock®](https://www.interlockroofing.com/blog/quality-roof-materials/): A roof is only as good as its weakest component. Interlock builds the whole system to last — aircraft-grade aluminum panels, stainless-steel fasteners, and cast
- [Is It Cheaper to Put a Metal Roof or Shingles? | Interlock®](https://www.interlockroofing.com/blog/is-it-cheaper-to-put-a-metal-roof-or-shingles/): Asphalt shingles are cheaper to install today; a metal roof is cheaper to own. Shingles run roughly $120–$400 per square and last 15–20 years, so you replace th
- [Clay or Concrete Tile Roof Problems | Interlock®](https://www.interlockroofing.com/blog/clay-or-concrete-tile-roof-problems/): Clay and concrete tile roofs are beautiful and long-lasting, but they crack, slide, and chip, grow moss and stains, and sit on underlayment that fails decades b
- [Historic Metal Slate Roofing in Gloucester, MA](https://www.interlockroofing.com/blog/historic-metal-roofing-excellence-interlock-metal-slate-on-the-samuel-gilbert-house-in-gloucester-ma/): The 1750 Samuel Gilbert House in Gloucester, MA — a 275-year-old colonial landmark — was preserved with a Black Interlock Metal Slate roof in 2012. It delivers 
- [Maximizing Energy Efficiency with Metal Roofs](https://www.interlockroofing.com/blog/maximizing-energy-efficiency-the-benefits-of-metal-roofs/): Interlock's reflective aluminum roofing can cut cooling costs by up to 25% by bouncing the sun's heat away instead of absorbing it. Paired with a lifetime warra
- [The Effects of Snow on Your Roof | Interlock®](https://www.interlockroofing.com/blog/effects-snow-roof/): Snow damages roofs by weight, not depth — and a foot of wet snow can outweigh several feet of powder. An Interlock aluminum roof adds almost no load of its own 
- [Minimum Roof Pitch for a Metal Roof | Interlock®](https://www.interlockroofing.com/blog/minimum-roof-pitch-for-a-metal-roof/): The minimum pitch for all Interlock Metal Roofing Systems is 3:12 — meaning the roof rises 3 inches for every 12 inches of horizontal run. Adequate slope lets w
- [Do Roofs Last Forever? Why Roofs Need Replacing](https://www.interlockroofing.com/blog/what-you-think-roofs-last-forever/): No roof lasts forever — weather wears every roof out eventually. But the gap is enormous: asphalt shingles last 15–20 years (often less), while an Interlock alu
- [Roofing Wind Damage: 120 MPH Rated Metal Roofs | Interlock®](https://www.interlockroofing.com/blog/roofing-wind-damage/): Interlock metal roofs are tested and warranted to resist 120 mph winds — Category 2 hurricane strength — and are Florida Building Code approved for High-Velocit
- [5 Interlock Metal Roof Styles: Slate, Shake, Tile & More](https://www.interlockroofing.com/blog/explore-diverse-metal-roof-styles-for-your-home/): Metal roofing comes in three materials (aluminum, steel, copper) and many looks — slate, shake, shingle, tile, and standing seam. Aluminum lasts 30–70+ years an
- [What Does 'Solar Friendly' Mean? | Interlock®](https://www.interlockroofing.com/blog/what-does-solar-friendly-mean/): “Solar friendly” means a roof is built to work with solar panels — and to outlast them. Interlock qualifies on every count: 95% recycled aluminum, a 40–70+ year
- [Why Proper Roof Installation Is Crucial for Your Home](https://www.interlockroofing.com/blog/why-proper-roof-installation-is-crucial-for-your-home/): An Interlock roof is an interlocking system of components — panels, flashings, valleys, backpans, collars, drip caps, underlayment, and specialty fasteners — no
- [15 Roof Types Explained: Shapes, Pitch & Metal Roofing Fit](https://www.interlockroofing.com/blog/15-most-popular-roof-types-and-their-characteristics/): Roof type refers to the shape of the roof — gable, hip, gambrel, mansard, flat, and a dozen more — and each has its own strengths in cost, weather resistance, a
- [What Is Cool Roofing? CRRC Ratings & Benefits | Interlock®](https://www.interlockroofing.com/blog/what-is-cool-roofing/): A “cool roof” reflects the sun’s heat instead of absorbing it, lowering cooling bills and indoor temperatures. Interlock’s energy-efficient Alunar® finish refle
- [Mounting Solar Panels on an Interlock Metal Roof](https://www.interlockroofing.com/blog/installing-solar-panels-with-an-interlock-metal-roofing-system/): An Interlock metal roof is an ideal base for solar: it lasts 40–70+ years (far longer than a 25–30 year array), so you never remove panels to re-roof. Standing 
- [Investing in a Sustainable Future: Recyclable Roofing](https://www.interlockroofing.com/blog/investing-in-a-sustainable-future/): A truly sustainable roof does two jobs: it lasts so long it’s rarely replaced, and it helps power the home. Interlock pairs a 95%-recyclable aluminum roof — mad
- [Extreme Roofing: Interlock on an Antarctic Science Base](https://www.interlockroofing.com/blog/extreme-roofing-interlock-selected-for-antarctic-science-base/): When the U.S. National Science Foundation needed roofing for a research module bound for Antarctica, it chose Interlock. The aluminum system endures −60°F cold,
- [Jill McKnight Tours Interlock's Delta, BC Aluminum Roofing Plant](https://www.interlockroofing.com/blog/hon-jill-mcknight-discusses-manufacturing-and-tariffs-with-interlock-metal-roofing/): On July 3, 2025, The Honourable Jill McKnight, MP for Delta and Canada’s Minister of Veterans Affairs, toured Interlock Metal Roofing’s Delta, BC manufacturing 
- [Why This Bremerton Home Chose a Rust-Proof Roof](https://www.interlockroofing.com/blog/why-this-bremerton-home-chose-a-roof-that-doesnt-rust/): A waterfront Bremerton, Washington home traded its rust- and rot-prone roof for a Copper Penny Interlock Aluminum Shake — the warm look of copper, with aluminum
- [The Best Types of Metal Roofing for Your Home](https://www.interlockroofing.com/blog/the-ultimate-guide-to-the-best-types-of-metal-roofing-for-your-home/): Interlock makes six aluminum and copper roofing profiles — Slate, Cedar Shingle, Cedar Shake, Mediterranean Tile, Standing Seam, and Solid Copper. All share the