Max-Rib is a low profile (3/4") panel that is well suited for commercial, agricultural and residential applications. Max-Rib is utilized extensively on post frame buildings as well as residential homes. Varying applications, end uses, and expectations require different metal panel alternatives. Fortunately, McElroy’s popular Max-Rib profile is available in five distinct options: Max-Rib Ultra, Max-Rib II, Max-Rib 100Max-Rib 185, and Max-Rib Commodity. The best choice for your individual project depends on factors such as desired longevity, aesthetic appeal, and budget.

Max-Rib Ultra - Galvalume® substrate with Kynar 500® (PVDF) coating

For unsurpassed performance in a light gauge panel, Max-Rib Ultra is the ultimate choice. This distinctive metal panel combines the long-life performance of a Galvalume steel substrate with a fade and chalk resistant Kynar 500® based Fluropon® paint system. The end result is an exceptional metal panel that provides unmatched resistance to chalking and fading and is your assurance that your project will retain its beauty year-after-year.

Max-Rib II - Galvalume substrate with a Silicone Modified Polyester (SMP) coating

Combining the long-life characteristics of a Galvalume steel substrate with the proven performance of a high-quality Silicone Modified Polyester (SMP) coating, Max-Rib II is an excellent multi-use metal panel.

Max-Rib 100 - Galvanized G100 substrate with a Silicone Modified Polyester (SMP) coating

Combining a zinc-coated G100 Galvanized substrate with a high-quality Silicone Modified Polyester coating, Max-Rib 100 is an ideal panel when a Galvanized substrate is required.

Max-Rib 185 - Bare Galvanized substrate 

McElroy inventories a limited quantity of G185 Bare in Marshall, MI.  Please inquire for availability and lead times.

Max-Rib Commodity

Max-Rib Commodity is a 10-year warrantied economical interior panel that is ideal for basic shade and shelter applications.

Post Frame Trim

Residential Trim

Substrates and Coatings 


  • Minimum slope: 1:12 (with sealant)
  • Minimum slope: 3:12 (without sealant)
  • Max-Rib also available with MoistureLok

  • Oil Canning is a natural occurrence in metal panels and is not a cause for panel rejection

Testing Data

  • Fire Rating: Class A
  • Uplift Test: UL 580 Class 90
  • Class 4 Impact Resistance: UL2218
  • Florida State Approval: 1747.2, 1832.3
  • Fire Resistance: UL263
  • Texas Department of Insurance Approval: Evaluation RC-157

  • For any available Test Data, Section Properties or Load Tables, please visit our downloads section

Panel Options

  • Coating:
    - Kynar 500® (PVDF)
    Silicone Modified Polyester (SMP)
  • Substrate:
    - Standard 29 and 26 GA Galvalume®
    - Standard 29 GA G100 Galvanized


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