Modular AL

Modular AL is a PAC-CLAD cassette-style metal wall panel system made of aluminum by Petersen. Panels of different sizes, depths and colors are combined in one wall, and vertical and horizontal panels can share a layout.

The system is a pressure equalized rainscreen. The guide specification covers it under Section 074210, Metal Plate Wall Panels.

• Standard sizes: 16 inches by 72 inches and 16 inches by 120 inches.
• Depth range: 1-3/8 inches to 3 inches.
• Joint range: 1/2 inch to 1 inch.
• Module spacing: 16 inches on center.
• Custom sizes are made through the factory.
• Maximum dimensions: 16 inches by 120 inches in .050, .063 and .080 aluminum.

Panels are tension-leveled aluminum, .050 inch minimum and .080 inch maximum, with minimum panel depth of 1.375 inches. Available thicknesses are .050, .063 and .080 inch, each up to 16 inches by 120 inches. The system alloy is 3105-H14, and the tension-leveled plate is 3003-H14.

The exterior finish is Kynar from Sherwin Williams in 46 standard PAC-CLAD colors, wood grain finishes, ore finishes or a custom color, and any combination can be used on one project. The PAC-CLAD finish is 70% PVDF.

• Flat or tapered panels.
• Concealed fasteners and no sealants.
• Weep holes for pressure and moisture venting.
• Panels can be perforated, including patterns that spell words or form logos.
• Layouts: running bond, stacked, mosaic and raised mosaic.
• Aluminum content is 100% recycled.

Panels install on plywood, insulation, purlins or a mix of these. Sub-girts are 16-gauge minimum, as 7/8 inch hat sections, C or Z sections or flat strap. Panel fasteners are stainless or equivalent with a head at least 7/16 inch in diameter.

Each panel has a single horizontal factory pre-punched attachment, and its interlocking gutter and drainage are integral to the panel. Secondary drainage channels, brackets, support pins, joint sealants and gaskets are not used to manage drainage.

The rainscreen requirement follows AAMA 508-14 and is described in terms of AAMA CW-RS-1-04.

Pressure equalization is tested to ASTM E1233 at 1200 Pa (25 psf) for 100 three-second cycles. Air leakage is no more than 0.6 cfm/sf at 1.57 psf (ASTM E283). Static water penetration is none after 15 minutes at 6.24 psf minimum (ASTM E331). Structural testing is to ASTM E330 without permanent deformation.

• AAMA 508: 24 x .050 panel.
• ASTM E1592: 3 inch deep by 24 inch by .050 aluminum, and 3 inch deep by 30 inch by .080 aluminum.
• ASTM E283 and E331: 24 x .050 panel.
• ASTM E330: 30 x .080 panel.
• T264-21 (ASTM E330): 3 x 24 x .050.
• T265-21 (ASTM E330): 3 x 30 x .080.

Florida Approvals are listed for wall panels.

Wood-substrate details are published as PDF and CAD drawings: base, combined, endwall, head, inside corner, jamb, mitered outside corner, two outside corner options, panel, top of wall and window sill. A BIM object is also published. Installations shown by the manufacturer include La Crosse Fire Station #2 and Pana Elementary School in Pana, IL.

Trim, copings, fascia, sills and corner units are at least .040 inch thick and match the panel material and finish. Extrusions are extruded aluminum with an integral drainage system. Centria and Pohl Metal Panel Systems are the other named manufacturers.

Where a wall needs cladding that suits the rainscreen wall system category, this product is the PAC-CLAD aluminum cassette option.

The panel assembly carries a two-year warranty and the finish a 20-year warranty, both from substantial completion in the guide specification. The 11/23 edition of the sales sheet carries a 30-year finish warranty, and the 2025 spec sheet and the current product page a 35-year finish warranty.