--- title: What Are Metal Roofs Made Of? description: Learn what goes into metal roofing products to give them the durability, design versatility and quality that they are known for. image: https://www.decra.com/hubfs/What-are-metal-roofs-made-of.jpg --- - [ Blog ](https://www.decra.com/blog) Enter your email address and zip code to find contractors in your area - [ Gallery ](https://www.decra.com/metal-roofing-gallery) Enter your email address and zip code to find contractors in your area - [ For Professionals ](https://www.decra.com/pro) Enter your email address and zip code to find contractors in your area - Find Contractor Enter your email address and zip code to find contractors in your area - [ (877) 463-3272 ](tel:8774633272) Enter your email address and zip code to find contractors in your area - [ METAL TILE ROOFING ](https://www.decra.com/metal-tile-roofing) - [ METAL SHINGLE ROOFING ](https://www.decra.com/metal-shingle-roofing) - [ METAL SHAKE ROOFING ](https://www.decra.com/metal-shake-roofing) - QUICK LINKS - [Design Your Roof](https://www.decra.com/design) - [Request Sample and Estimate](https://www.decra.com/request-sample) - [Metal Roofing Blog](https://www.decra.com/blog) - [Metal Roofing Myths](https://www.decra.com/metal-roofing-myths) * Menu * * Menu * - HOMEOWNERS - [ Request Sample and Estimate ](https://www.decra.com/request-sample) - [ See DECRA on Your Home ](https://www.decra.com/design) - [ Register Warranty ](https://www.decra.com/register-warranty) - PROFESSIONALS - [ Join Contractor Network ](https://www.decra.com/join-contractor-network) - [ Visit Knowledge Base ](https://www.decra.com/pro) - [ Ventilation Calculator ](https://www.decra.com/ventilation-calculator) - Resources - [ Blog ](https://www.decra.com/blog) - [ Gallery ](https://www.decra.com/metal-roofing-gallery) - [ Case Studies ](https://www.decra.com/case-studies) - [ Metal Roofing Myths ](https://www.decra.com/metal-roofing-myths) - [ 1230 Railroad St, Corona, CA 92882 ](https://www.google.com/maps/place/1230+Railroad+St,+Corona,+CA+92882/@33.8877827,-117.5875414,17z/data=!3m1!4b1!4m5!3m4!1s0x80dcc85b2843c881:0xde8667dc4e01a741!8m2!3d33.8877827!4d-117.5853527) - [ (877) 463-3272 ](tel:8774633272) [![Request Call](https://no-cache.hubspot.com/cta/default/5712265/09a36b95-b407-4c8b-934b-39d40abbba7b.png)](https://cta-redirect.hubspot.com/cta/redirect/5712265/09a36b95-b407-4c8b-934b-39d40abbba7b) - - - - - # What Are Metal Roofs Made Of? - By [ Mark Gallant ](https://www.decra.com/blog/author/mark-gallant) - January 3, 2022 - [Homeowners](https://www.decra.com/blog/tag/homeowners) [Contractors](https://www.decra.com/blog/tag/contractors) [What is Metal Roofing](https://www.decra.com/blog/tag/what-is-metal-roofing) ![](https://www.decra.com/hubfs/What-are-metal-roofs-made-of.jpg) What Are Metal Roofs Made Of? 6:04 Metal roofing has dominated the industrial sector for more than a century. Factories, warehouses and other industrial buildings have long benefited from the durability that only metal roofing can provide. Historically, metal roofing products lacked the style, beauty and design versatility required for the residential sector. This all changed in 1957 when an innovative manufacturing process bridged the gap between industrial durability and architectural beauty. Today, [metal roofing](https://www.decra.com/blog/10-things-to-know-about-metal-roofing) is the second most popular roofing material on the market and its many benefits are no longer limited to the industrial sector. Keep reading to learn what goes into DECRA Metal Roofing products to give them the [durability](https://www.decra.com/blog/why-metal-roofing-is-the-best-choice-for-all-regions-and-all-seasons), [design versatility](https://www.decra.com/blog/strength-and-beauty-for-all-styles-with-stone-coated-metal-roofing) and [quality](https://www.decra.com/blog/decra-metal-roofing-testing-for-quality-above-and-beyond-the-competition) that they are known for. [![DECRAMetalRoofing_Sample](https://www.decra.com/hs-fs/hubfs/DECRA_CTA_Banner_Request_Sample.png?width=646&name=DECRA_CTA_Banner_Request_Sample.png)](https://www.decra.com/request-sample) #### Aluminum-Zinc Alloy Coated Steel All DECRA roofing products are precisely formed from structural quality sheet steel complying with ASTM Designation A 792/A 792-10; grade 37, modified with a minimum elongation of 22%, and with an AZ50 coating class. The high-grade steel used in DECRA products is treated with a hot-dip metallic coating composed of aluminum, zinc and silicon. Both aluminum and zinc have excellent anti-corrosive properties, but they work even better when combined together. For example, a coating of 100% zinc (also known as galvanized steel) provides exceptional bare-edge protection for cuts and drilling. But, 100% zinc coatings are what engineers call “sacrificial,” meaning that corrosion will eventually find its way into the steel sheet over time. That is why DECRA uses an advanced aluminum-zinc alloy coating that protects up to four times longer than traditional galvanized steel. When the zinc’s sacrificial barrier breaks down over time, the more durable aluminum component in the alloy ensures that an effective corrosive barrier is still present. While the aluminum and zinc alloy components combine to provide outstanding corrosion resistance, the silicon in DECRA’s formula ensures the protective steel coating remains firmly fixed to the steel. Silicon also allows for bending during the manufacturing and installation processes. | It’s important to note that not all aluminum-zinc alloys are created equal. For example, AZ50 is the minimum industry quality standard for coating thickness and specifies that there is a minimum coating weight of 0.50 ounces per square foot on both sides of the steel sheet. But some overseas manufacturers produce imitation DECRA products using a cheaper AZ35 alloy – a much thinner coating that is highly susceptible to degradation by corrosion, especially when installed on roofs in a salt-air rich environment, such as coastal areas. | | --- | #### Acrylic Resin Coatings DECRA uses a state-of-the-art acrylic resin coating applied on both sides of the aluminum-zinc alloy hot-dip steel coils. The brown-tint or clear resin coating is specially formulated to resist fingerprints and scuffing during product handling. The acrylic resin coating also provide the ideal surface for adhering the stone granules to the base steel sheet. #### Stone-Coated Granules DECRA’s s[tone-coating manufacturing](https://www.decra.com/blog/what-is-stone-coated-metal-roofing) process bridges the gap between industrial durability and design versatility. Adding stone granules allows DECRA to produce a wide range of roofing styles, colors and textures that replicate the look of traditional roofing materials such as asphalt shingles, tile or wood shake. The natural stone granules are mined at a quarry, then crushed and screened to size. >>>Related Resource: [*Learn more about DECRA’s stone-coated granules*](https://www.decra.com/hubfs/DECRA%20Product%20Knowledge%20-%20Quality%20Roofing%20Granules%20-%20Features%20and%20Benefits.pdf). The granules are then coated with a combination of pigments, similar to paint, and then baked at high temperatures. Given the intense solar UV exposure on a roof, the roofing granules must be durable and fade-resistant, which is why DECRA utilizes a leading roof granule source and state-of-the-art computerized roofing granule blending and application machinery to ensure a quality stone coat manufacturing process. For example, using a spectrophotometer, several color readings are conducted at different intervals during the manufacturing process to ensure the pigmentation has adhered properly to the stone granule. This also ensures that the color will remain stable over time. In addition to the high-quality steel, stone granules and manufacturing processes, DECRA takes pride in conducting extensive, lab-verified testing to ensure the quality that our roofs are known for is present in each and every panel. #### Extensive Testing As the [original stone-coated metal roofing manufacturer](https://www.decra.com/), DECRA’s formula has withstood the test of time and has set the industry standard for quality since 1957. DECRA’s reputation for quality comes from the fact that we submit all products for independent lab testing above and beyond what is required. Most roofing manufacturers strive to satisfy just the minimum U.S. building code requirements, narrowly focused on wind and fire resistance. For example, many of our competitors, especially overseas manufacturers, don’t offer their products in Canada since the weather conditions of the region require rigorous testing that is beyond the scope of their products. DECRA, on the other hand, has had a long-established reputation for quality in Canada and our [roofs have been enduring harsh Canadian winters for decades](https://www.decra.com/hubfs/DECRA-metal-roofing-ottawa-case-study.pdf) – still retaining their original beauty and strength. >>>Related Resource: *[Learn how DECRA tests for quality and durability](https://www.decra.com/blog/decra-metal-roofing-testing-for-quality-above-and-beyond-the-competition).* #### See and Feel the DECRA Difference Now that you know what goes into a DECRA roof, it’s time to see and feel the difference. See how good a DECRA roof looks on your home by uploading a picture of your home to the [DECRA Roof Designer](https://www.decra.com/design). Once you find the perfect style, [order a free sample](https://www.decra.com/request-sample) to feel the DECRA difference. YOU MIGHT ALSO LIKE ![feature image](https://www.decra.com/hubfs/decra-metal-roofing-web-title-24.jpg) [Title 24: What Homeowners Should Know About Cool Roofs](https://www.decra.com/blog/title-24-what-homeowners-should-know-about-cool-roofs) July 17, 2026 ![feature image](https://www.decra.com/hubfs/decra-metal-roofing-web-rain-on-metal-roof.jpg) [Are Metal Roofs Loud in the Rain?](https://www.decra.com/blog/are-metal-roofs-loud-in-the-rain) July 10, 2026 ![feature image](https://www.decra.com/hubfs/decra-metal-roofing-web-fireworks-and-metal-roofing.jpg) [What Happens When Fireworks Hit a Metal Roof?](https://www.decra.com/blog/what-happens-when-fireworks-hit-a-metal-roof) July 2, 2026 ### Subscribe to Our Blog ![cta-image-1](https://www.decra.com/hs-fs/hubfs/cta-image-1.webp?width=767&height=767&name=cta-image-1.webp) [![Request a complimentary sample](https://no-cache.hubspot.com/cta/default/5712265/9d22d188-56ec-46a6-94a4-a438bce4f6bc.png)](https://cta-redirect.hubspot.com/cta/redirect/5712265/9d22d188-56ec-46a6-94a4-a438bce4f6bc) ABOUT DECRA Since 1957, DECRA stone-coated metal roofs have bridged the gap between industrial durability and architectural beauty. ### Post By Topics - [Homeowners](https://www.decra.com/blog/tag/homeowners) - [What is Metal Roofing](https://www.decra.com/blog/tag/what-is-metal-roofing) - [Why Metal Roofing](https://www.decra.com/blog/tag/why-metal-roofing) - [Best Roof for my Region](https://www.decra.com/blog/tag/best-roof-for-my-region) - [Contractors](https://www.decra.com/blog/tag/contractors) - [Metal Roofing](https://www.decra.com/blog/tag/metal-roofing) - [Home Remodel](https://www.decra.com/blog/tag/home-remodel) - [Roof Remodel](https://www.decra.com/blog/tag/roof-remodel) - [Hurricane](https://www.decra.com/blog/tag/hurricane) - [Damaged Roof](https://www.decra.com/blog/tag/damaged-roof) - [Hail](https://www.decra.com/blog/tag/hail) - [Storm](https://www.decra.com/blog/tag/storm) - [Tornado](https://www.decra.com/blog/tag/tornado) - [Wind](https://www.decra.com/blog/tag/wind) - [Snow](https://www.decra.com/blog/tag/snow) - [Home Builders](https://www.decra.com/blog/tag/home-builders) - [Solar Energy](https://www.decra.com/blog/tag/solar-energy) - [Rain](https://www.decra.com/blog/tag/rain) - [Project of the Year](https://www.decra.com/blog/tag/project-of-the-year) - [DECRA Contractor Network](https://www.decra.com/blog/tag/decra-contractor-network) - [Energy Efficiency](https://www.decra.com/blog/tag/energy-efficiency) - [Fire](https://www.decra.com/blog/tag/fire) - [Ice](https://www.decra.com/blog/tag/ice) - [Insurance](https://www.decra.com/blog/tag/insurance) - [Asphalt Shingles](https://www.decra.com/blog/tag/asphalt-shingles) - [Commercial](https://www.decra.com/blog/tag/commercial) - [Concrete Tile](https://www.decra.com/blog/tag/concrete-tile) - [Earthquakes](https://www.decra.com/blog/tag/earthquakes) - [Hail Damage](https://www.decra.com/blog/tag/hail-damage) - [Historic Renovation](https://www.decra.com/blog/tag/historic-renovation) - [Manufacturing](https://www.decra.com/blog/tag/manufacturing) - [Roof-Over](https://www.decra.com/blog/tag/roof-over) - [Warranty](https://www.decra.com/blog/tag/warranty) - [Show All](https://www.decra.com/blog/all) ** Back to Top Help us improve your experience. 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