With an opportunity to choose from three distinct Maxima profiles: Maxima, Maxima 1.5 and Maxima ADV, McElroy’s Maxima family of products represents the industry’s broadest selection of vertical leg standing seam systems. In order to meet the varying needs of architects and contractors, each offers unique performance characteristics that enable users to match a Maxima panel to specific aesthetic and performance specifications.  All Maxima panels are mechanically seamed. Mechanical seamers and hand crimpers are available for rent through Developmental Industries (DI) at, a website created just for McElroy customers. The rental fees for each type of equipment can be found on this site as well as additional information you may need to be aware of within the terms and conditions. DI is the only approved supplier for this type of equipment. 

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  • Mechanically seamed profile
  • Factory applied sealant
    (on non-curved panels only)
  • Factory formed eave notch upon request
  • Minimum slope: 1:12 for 1.5"
  • Minimum slope: 1/2:12 for 2"
  • Minimum slope: 1/4:12 for 3"
  • Can be installed over solid deck or open framing
  • Maxima 2" and ADV also available jobsite formed for long lengths
  • Floating clips allow for 3 1/8" thermal movement

  • 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:
    UL580 Class 90
    FM 4471 (2" only) (1-90 Rated)
    ASTM E1592 (1.5", 2" & 3")
  • Air Infiltration: ASTM E1680 
  • Water Infiltration: ASTM E1646
    Class 4 Impact Resistance: UL 2218
  • Florida State Approval:
    1747.3, 1832.4  (2" & 3")
  • Fire Resistance: UL263 
  • Miami-Dade Approval: (2:16 Only) NOA #11-1228.02 and 17-0320.04
  • ICC-ES Approval: ESL-1082
  • All testing conducted with Galvalume® substrate

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

Panel Options

  • Seam height: 1.5”, 2” & 3”
  • Maxima: 90 degree seam
  • Maxima 1.5 and ADV: 180 degree seam
  • Panel width: 12", 16", 18" and 24"
  • Panel configurations:
    Maxima, Maxima 1.5 and ADV:
    flat, striated, pencil ribs,
    minor ribs (3" only)
    Maxima 1.5 and ADV: curved

  • Coating:
    - Kynar 500® (PVDF)
  • Substrate:
    - Standard 24 GA Galvalume®
    - Options 22 GA Galvalume
    - Optional .032 and .040 aluminum
      No testing available on aluminum
  • Maxima aluminum is produced in
    Sunnyvale, TX 

Availability Chart

Click image to enlarge

Maxima Attributes

Curving Information

  • Only Maxima 1.5 and Maxima ADV can be curved.
  • Minimum radius (steel):  Maxima 1.5 - 12’ and Maxima ADV – 25’
  • 180 degree seam required
  • Sealant to be field applied on curved applications
  • Maxima 1.5 and Maxima ADV flat panels will curve naturally on a radius of 250’ or greater

Curved Images

Click image to enlarge