Exposed Fastener vs. Concealed Fastener

Both exposed fastener and concealed fastener metal roofing systems from J and J Welding and 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.

  • Steel Fabrication

    Maxalume (Galvalume®)

    Maxalume 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 both milled and premium coated finishes, our Maxalume 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.

  • Steel Fabrication


    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.

  • Steel Fabrication


    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 panels, the coating system, or painted surface, will be exposed to many environmental elements, including harsh UV rays, acid rain, dirt, etc. When shopping for metal roofing, 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 metal roofing system.

Metal panel coatings are made of resin, pigment, solvents and additives. These elements are combined and applied to metal prior to the metal panel–forming process to ensure uniform color, sheen and thickness of the coating. The primary difference between all the metal roofing coating products available today is the type of resin used to bind the coating elements together. J and J Welding and Fabricators exclusively uses the industry’s leading coating systems: Kynar 500®, a polyvinylidene fluoride (PVDF) coating, and Valspar’s Weather XL®, silicone modified polyester based coating known as SMP.

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

Standard Polyester SMP Weather XL Kynar 500
Film Integrity Excellent Excellent Excellent
Color Retention Good Very Good Excellent
Chalk Resistance Good Very Good Excellent
Dirt Resistance Good Very Good Very Good
Glass Retention Good Very Good Excellent
Cost $ $$ $$

Contact Us

  • Main Location: 364 Recker Hwy, Auburndale, FL 33823, USA

  • Other Location: 7111 Bayou George Rd, Panama City, FL 32404, USA

  • Phone: +1 813-754-0771

  • Email:

  • Manufacturing Sites: View our Google Map

Auburndale Location

Panama City Location

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