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Exposed Fastener Panel Products

What are Exposed Fastener Panels?

Exposed fastener panels by McElroy Metal offer immense versatility because of the wide range of panels offered. Customers can select from 12 different panel styles. McElroy Metal’s Exposed Fastener panels are not just utilized on exterior applications.  They are also commonly used for interior applications, like liner panels and architectural elements.  

McElroy’s Exposed Fastener panels offer outstanding technical properties and can be utilized for both new construction and retrofit projects.

Exposed Fastener Panels

Advantages of Exposed Fastener Systems


3’ coverage means panels are quick to install (this doesn’t apply to 5V)


Exposed fasteners make single panel replacement easy


Cost-effective entry product with solid performance and life expectancy.


12 different profiles offer extensive aesthetic options


Steel liner panels allow bright interior spaces that can be washed down much easier than drywall.


Intermediate ribs reduce the phenomena and appearance of oil canning

Exposed Fastener Panel Systems

Exposed fastener panels are the most economical form of metal roofing and siding.  Panels are over-lapped and fastened directly to the roof deck or framing through the face of the metal panel. These panels are called exposed fastener because the fastener head remains visible once installed. To help blend with panels, fastener heads are painted the same color as the roofing panels. Most exposed fastener panels are typically 36” wide, meaning that fewer panels (and less labor) will be needed to cover the roof area.

Exposed fastener panels are identified by 5 main criteria:

  • Rib Height
  • Center to Center Rib Spacing
  • Panel Width
  • Cover Width after lapping
  • Minimum Slope
5V Exposed Fastener Panel


Max-Rib is a low profile (3/4") panel that is very popular with homeowners across the country due to its aesthetic appeal and price point. This panel profile is also very common in the industry and many manufacturers offer this panel in a wide variety of steel substrates and coatings. Homeowners should make sure the product being installed on their home matches their long-term performance criteria. For residential applications, McElroy strongly recommends a Galvalume steel substrate with Kynar 500® (PVDF) coatings, which offer optimal performance and protection against fade and chalk.

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Multi-Rib is McElroy’s proprietary version of the industry’s standard R-Panel and commonly utilized for residential roofing, primarily in the Southwestern region. Featuring 1 1/4" major ribs, 12 inches on center, Multi-Rib's bold profile adds a distinct beauty to any home. An optional Purlin Bearing Leg (PBR) rests on substructural framing or roof deck to provide support for fastening the panel lap.

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McElroy’s R-Panel features a 1 1/4" major rib, 12 inches on center. With a bold profile, R-Panel is commonly utilized for residential roofing, primarily in the Southwestern region of the US. An optional Purlin Bearing Leg (PBR) rests on substructural framing or roof deck to provide support for fastening the panel lap.

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Mega-Rib is a 7.2 exposed fastener panel that provides optimum strength and spanning capabilities. Mega-Rib is a metal roof and wall panel that is equally well suited for industrial and commercial applications. 

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Modern Rib

Modern-Rib combines the economics of an exposed fastener panel but with major ribs that simulate standing seam panels. 

Modern-Rib is available with Silicone Modified Polyester (SMP) and Kynar 500® (PVDF) coatings. For long-term performance and curb appeal, McElroy always recommends PVDF coatings.

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Multi-Cor & M-Cor

Multi-Cor and M-Cor are classic corrugated roofing panels. Multi-Cor features a 3/4 rib height and M-Cor features a 1/2" rib height.  These corrugated panels are also commonly used for residential siding applications, installed both vertically and horizontally.

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Mesa is a low profile (3/4") panel that is similar in appearance to Max-Rib. However, Mesa is both patent and copyright protected, which means it can't be copied by manufacturers offering lower quality steel substrates and coatings. Mesa is a great choice for homeowners that want quality assurance and a distinct appearance that can't be copied.

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McElroy’s 5V panels are 24" wide and incorporate a classic design that adds beauty to any home. 5V is especially popular along coastal areas in the South and Southwestern USA.

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U-Panel is an exposed fastener wall and roof panel. With a ¾” (approximate) rib height and 6” on center rib spacing, U-panel offers a lower profile and softer appearance than R-Panel or Multi-Rib.

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Exposed Fastener Roof Panel Options