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Choosing the Right Metal Roofing System for Your Project: What You Need to Know

Exposed Fastener vs. Concealed Fastener

Both exposed fastener and concealed fastener metal roofing systems from Extreme Metal Fabricators are a smart choice for nearly every building type. But its important to know the differences and the advantages of each.


Exposed Fastener Systems

(also called Screw-Through) 

  • Classic Metal Roofing Look and Feel

  • Fasteners (Screws) Visible

  • Easy to Install

  • Most Affordable Metal Roofing Option

  • Many Profile Designs (including Metal Tile Panels)

  • Can Be Used for Wall Applications

  • Easier to Repair if Damage Occurs

  • Available in Mill Finish or Painted Maxalume; Painted Aluminum


Concealed Fastener System

(also called Standing Seam)

  • Sleek Modern Look and Feel

  • Fasteners and Clips Hidden so Not Exposed to UV, Wind, Water and Other Elements

  • Allows for Better Thermal Movement

  • Can Be Used on More Complex Roof Designs

  • Can Be Used on Lower Pitched Roofs

  • Available in Mill Finish or Painted Maxalume; Painted Aluminum

How to Choose the Metal That is Best for Your Metal Roofing System 

Metal roofing panels are available in steel, aluminum and copper.  These metals all offer high-performing durability and longevity, but each has its own unique benefits.

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Maxalúme (Galvalume® - AZ50/AZ55) is a special type of galvanized steel made with an aluminum and zinc coating. It provides an ideal combination of corrosion resistance and durability. Available in acrylic-coated, 70% PVDF (Kynar 500®), SMP and Tedlar® PVF film finishes.


MagnaGuard (ZM150) is an aluminum-zinc alloy coated steel with the added strength of magnesium. Offering advanced corrosion and heat resistance to salt spray and humidity, this unique product is a great choice for coastal projects. Available coated with 70% PVDF (Kynar 500®)

Maxalume and MagnaGuard panels easily outperform regular galvanized steel in atmospheric corrosion and wind resistance tests. They also enhance fire protection and offer superior reflectivity and emissivity qualities, helping to reduce energy usage and related costs.

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Aluminum is the lightest metal roofing material available. It is extremely resistant to corrosion from saltwater spray making it a smart choice in coastal environments. Aluminum naturally reflects light and remits heat keeping the building underneath cooler.  The excellent malleability of aluminum also makes it the metal of choice for more complex roofing profiles or designs. Available in painted 70% PVDF (Kynar 500®) and Tedlar® PVF film finishes.



We manufacture our CopperMax roofing panels using Revere Copper, the world’s leader in copper milling for over 200 years. This premium American-made copper is known for its beauty, superior surface quality and exacting physical properties. It is weather, wind and fire resistant, easy to install and virtually maintenance free. One of the most durable and long-lasting of roofing materials, copper roofs have been known to last for generations, aging gracefully with a striking greenish-blue patina.

Find the Perfect Finish for Your Metal Roofing Project

For the life of your metal roof it will be exposed to many environmental elements, including harsh UV rays, acid rain, dirt, etc.
When shopping for a metal roofing system, it’s important to understand how the coating system you choose will stand up to
these tough conditions and add to the longevity of your new roof.


70% PVDF formulated with Kynar 500®

Polyvinylidene fluoride (PVDF) is a fluoropolymer resin that when combined with the hardness of acrylic delivers a durable, high-performing coating system that withstands the test of weather and time. Kynar 500® or Hylar® 5000S based PVDF resins are the preferred choice of coating formulators thanks to their high resistance to extended UV exposure. Providing superior durability, color stability and stain resistance compared with SMP, premium PVDF finishes provide improved performance against water, humidity and high temperatures, oxygen and other atmospheric pollutants. Decades of testing demonstrate that PVDF offers peak performance when it makes up 70% of the overall metal panel coating. When comparing PVDF finishes, beware of less expensive formulations that contain only 50% PVDF, as performance drops off considerably. EMF proudly offers only premium 70% PVDF coatings formulated with Kynar 500® resins in dozens of premium and metallic colors. Custom colors are also available.

WeatherXL™ (SMP)

Silicone Modified Polyesters (SMP) coatings use a blend of polyester and silicon intermediates and offer a more economical option compared with PVDF. Long-lasting polyesters offer durability, particularly in the resistance to UV degradation and polymerized silicone improves gloss retention and reduces fading due to chalking. SMP coatings offer a harder finish making them more resistant to rough handling; however, this also makes them less flexible than other coatings which can lead to tiny fractures during roll-forming of panels. SMP finishes vary greatly in quality with the most important difference being pigment type. Extreme Metal uses WeatherXL™ SMP coatings from Sherwin Williams®  formulated using ceramic and inorganic pigments. Ceramic pigments, similar to those used in PVDF coatings, offer superior color stability, chalk and fade resistance, and better gloss retention over other SMP coatings. Standard and custom colors available.

Wondering which coating system is best for your project? Quickly compare Kynar 500, Valspar Weather XL, and Polyester coatings below.


Tedlar® PVF Film

Proven in the most extreme conditions, Tedlar® PVF film is the ultimate solution in metal panel protection. Formulated from a 100% polyvinyl  fluoride (PVF) fluoropolymer and pigments for color and gloss, this revolutionary coating by DuPont™ offers premium protection against corrosion in coastal and tropical environments that experience high temperatures and humidity, sea water and salt spray. Tedlar demonstrates advanced resistance to color fade and chalking and it will not crack, blister or check from UV rays, corrosion, acid rain or dirt. Aluminum applications will not experience corrosion from sea water and salt spray, including on direct oceanfront properties. And thanks to its unique chemical properties, PVF film is impervious to harsh chemicals and can be fabricated to the tightest of radii without cracks, loss of adhesion or color change. Available in the industry's most popular colors.

Wondering which coating system is best for your project? Quickly compare our premium coatings below.

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Ready to Get Started?  Let us guide you in choosing the right products for your next metal roofing project.

Call 772-872-8034  or Contact Us

Galvalume® is a registered trademark of BIEC International Inc. Kynar 500® is a registered trademark of Arkema Inc. Hylar® 5000S is a registered trademark of Solvay Solexis, Inc. WeatherXL is a registered trademark of SWIMC LLC. Tedlar® is a registered trademark of affiliates of DuPont de Nemours, Inc. and is used under license by Titan Steel Corporation and its affiliate Metal Alliance Supply LLC.

Exposed Vs Concealed
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