Palos Verdes Maxima-Dennis

Maxima Standing Seam Roof Panel

Versatile, mechanically seamed standing seam family engineered for high wind uplift, architectural flexibility, and long-term performance.

McElroy Metal’s Maxima panels are a family of mechanically seamed, concealed fastener standing seam systems, offering multiple rib heights, seam configurations, and panel widths. With leg heights from 1 ½” to 3” and pan widths from 12”-24”, our Maxima series is one of the most robust offerings in the industry.

Renderings & Profiles

Great for:

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WALLS
roofs-icon
ROOFS
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RESIDENTIAL
commercial-icon
COMMERCIAL
Maxima 1.5" Striated
Maxima ADV Striated
Maxima 2" Striated
Maxima 3" Striated
Maxima 1.5" Striated
Maxima 1.5" Flat
Maxima ADV - Pencil Ribs
Maxima ADV - Flat
Maxima ADV - Striated
Maxima 2" Double Pencil Rib
Maxima 2" Flat
Maxima ADV Striated
Maxima 3:18 Minor Rib
Maxima 3:24 Minor Rib
Maxima 3" Striated
Maxima Standing Seam Roof Panel Specs at a Glance
Panel Type
Rib Height
Major Rib On Center
Cover Width
Factory Panel Length
Onsite Forming Available
Substrate/Gauges
Installation
Finishes
Minimum Slope
Concealed fastener, mechanically seamed
1 1/2", 2", 3"
1.5"; 2" & ADV: 12", 16", 18"; 3": 18", 24"
1.5"; 2" & ADV: 12", 16", 18"; 3": 18", 24"
Up to 70' (varies by manufacturing facility)
Yes
Std: 24 GA Galvalume®, Opt: 22 GA Galvalume®, .032/.040 Aluminum
Solid deck or open framing
Kynar 500® (PVDF)
1.5": 1:12, 2": 1/2:12, 3": 1/4:12

Maxima Ideal Applications

  • Architectural, commercial, and industrial roofing where long panel runs and watertight seams are required.

  • Low- to steep-slope roofs needing structural capacity and tested performance.

  • Projects requiring high wind uplift resistance and factory-notched precision for faster installation.

  • Retrofit or new construction projects demanding long-term aesthetics and proven performance.

Maxima Ideal Application
Maxima Ideal Application
Maxima Ideal Application
Maxima Ideal Application
Maxima Ideal Application

Maxima Top 3 Benefits

  1. Proven Structural Strength: Mechanically seamed design with rib heights from 1 ½” to 3" delivers excellent wind uplift resistance and structural integrity for demanding environments.

  2. Long-Term Weather Protection: Concealed fasteners, continuous seams and in-seam sealant ensure watertight performance, while the Kynar 500® (PVDF) finish provides industry-leading fade and chalk resistance.

  3. Design Flexibility: Available in four profiles—Maxima 1.5, Maxima 2, Maxima ADV, and Maxima 3—to meet both architectural and structural design requirements.

Compare our standing seam panels using the tool below.

For information on all McElroy Metal products, visit our full product library.


Panel
Seam Type
Rib Height
Panel Widths
Minimum Slope
Install Substrate
Clips
Substrate / Gauges
Coating
Notable Approvals / Tests
Maxima Standing Seam Roof Panel
Mechanically Seamed Standing Seam
1 1/2", 2", 3"
1.5"; 2" & ADV: 12", 16", 18"; 3": 18", 24"
1.5": 1:12, 2": 1/2:12, 3": 1/4:12
Solid deck or open framing
Low Floating; Low Fixed; High Floating; High Fixed; Utility Fixed
Std: 24 GA Galvalume®, Opt: 22 GA Galvalume®, .032/.040 Aluminum
Kynar 500® (PVDF)
UL 263 Class A; UL 580 Class 90; FM 4471 (2" and 3" only); ASTM E1592; TDI (Maxima ADV only, over Plywood or Metal Deck and Open Framing); ASTM E1680/E1646; UL 2218 Class 4; Florida Product Approval; Miami-Dade (2"x16" only); ICC-ES Listing (2" only);

Weathertightness Warranties

If your project requires a Weathertightness Warranty and you don’t already have a job specific Pre-Approval Form issued by McElroy Metal, click the button below to get started.

Shop Drawing Service

Running short of time to complete your own shop drawings? McElroy Metal can help. Click the button below to provide us some basic information and we’ll be in touch soon to discuss your project specifics.

Download Shop Drawings

If you’re creating your own shop drawings, click the button below to gain full access to our CAD and PDF Files.

Helpful Videos

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

Maxima Curved Metal Roof Installed on Taylor Fire Station
Maxima Installed on Ampitheatre
Aerial View of Maxima Curved Metal Roof on High School
Maxima Installed on School
Maxima Curved Roof on Auditorium
Peachtree Solar-501-1

Notes & Manufacturing Locations

  • Manufacturing:

    • Maxima 1.5": Peachtree City, GA, Houston, TX

    • Maxima 2": Clinton, IL; Peachtree City, GA; Adelanto, CA; Sunnyvale, TX; Houston, TX

    • Maxima 3": Peachtree City, GA

  • Factory eave notch available for Maxima 2” upon request

  • Factory-applied sealant on non-curved panels

  • Pan Condition Choices:

    • Maxima 1.5"; 2" & ADV:

      • Striated (recommended)

      • Flat Pan

      • Striated

      • Pencil Ribs

    • 3”

      • Minor Ribs

  • Additional Material Options: (Note: Minimum quantity and additional lead-time may apply)

    • 22 GA Galvalume®

    • 032 and .040 aluminum

  • Oil canning is a natural occurrence in metal panels and not a cause for rejection.

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Why Choose McElroy Metal

McElroy Metal is an employee-owned manufacturer with more than six decades of experience producing high-quality metal roofing, wall systems, and substructural components. Our nationwide manufacturing and service center network ensures consistent availability, responsive support, and dependable delivery. Built on a culture of craftsmanship and partnership, our products are engineered for long-term durability and trusted performance on projects of every size.

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Find a Distributor / Contractor Near You

Whether you’re building a new home or planning renovations, a metal roof can deliver long-term cost savings and comfort. To explore your options and find the product that meets your aesthetic and budgetary needs, contact a McElroy Metal distributor or contractor in your area today. We can’t wait to help make your dream home a reality.

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Frequently Asked Questions

The questions below address common considerations and help guide product selection for your project.

What finish options are available?
Standard finishes include Kynar 500® (PVDF) coatings on 24 GA Galvalume® substrate, providing exceptional color retention and weather protection. For non-painted applications, we offer Galvalume® Plus (acrylic-coated). Learn More
What’s the main difference between Maxima 1.5 and Maxima 216?
The primary difference is rib height and load capacity. Maxima 1.5 offers a 1½" rib for architectural applications, while Maxima 216 provides a taller 2-1/16" rib for greater structural performance.
When should I choose Maxima ADV?
Choose Maxima ADV for your curved projects or when you require a 180 degree seam and a 2” rib height.
What’s the minimum slope for Maxima panels?
The minimum slope for Maxima panels varies from ¼:12 for Maxima 324 to ½”12 for Maxima 216 & ADV and 1/12 for Maxima 1.5.
Can Maxima panels be curved or tapered?
Yes. Some of the Maxima family of panels can be curved under controlled conditions; contact McElroy Metal for project-specific radius limitations.