M-42 and M-36 Panels

The M-42 and M-36 Panels are two ribbed panels of the PAC-CLAD | Petersen exposed-fastener range. They share a 3/4 inch rib height and differ in overall width: 42 inches for the M-42 and 36 inches for the M-36. Both are used in roof and wall applications as exposed-fastener metal roof panels. They are lappable and fastened directly through the panel face to the substrate.

• M-42: 42 in. nominal width, 3/4 in. high, ribs 6 in. on center, 42 in. installed coverage.
• M-36: 36 in. nominal width, 3/4 in. high, ribs 6 in. on center, 36 in. installed coverage.

The M-42 profile drawing shows a 1 inch dimension alongside the 6 inch rib spacing, and the M-36 drawing shows 1-1/32 inches. The shortest precut length is 3 feet on the M-42 and 5 feet on the M-36. Lengths reach 30 feet in steel and 22 feet in aluminum.

The M-36 and M-42 are suited to wall and equipment screen projects. They are not intended for metal buildings or structural roof applications. The M-42 is made only at the Tyler, TX facility. In the exposed-fastener range, the 7.2 Panel, R-36 Panel and 7/8 inch Corrugated are the profiles listed for roofs, walls and linear panels, and the 1/2 inch Corrugated is grouped with the M-36 and M-42 for walls and equipment screens.

Both panels are made in .032, .040 or .050 aluminum, or in 24 gauge steel, with Galvalume Plus available. 22 gauge steel is listed for the M-36 only. Steel is specified to ASTM A792 and aluminum to ASTM B209.

The coating is a Kynar 500 or Hylar 5000 fluorocarbon with a 0.70 to 0.90 mil topside film on a 0.25 to 0.3 mil prime coat, a total of 0.95 to 1.25 mil dry film thickness, and a 0.25 mil underside primer. The finish meets AAMA 621. A 35-year non-prorated finish warranty is offered for the M-series panels.

Matching screws and rivets and closure strips are available. Closures are pre-molded polyethylene to match the rib profile. Trim is press-broken in 10 to 12 foot lengths. Flashing and trim are formed in aluminum from .032 to .063 or in 24 or 22 gauge steel, and vinyl masking is applied where extra handling is expected, with the strippable film removed right after installation.

Panel-to-purlin screws use steel and EPDM washers and penetrate the support by 1 inch. Sidelap screws are #14 HHA x 3/4 inch at 12 inch centers.

• M-36 negative load tables: .032 aluminum and 24 gauge steel.
• M-42 load tables, Tyler only: .032 aluminum and 24 gauge steel.
• M-42 and R-41 panel fastening data, Tyler only.
• Florida Building Product Approval: roofing, non-HVHZ.

Z-girt details are published in horizontal and vertical versions as PDF and CAD drawings. Each set has 11 details: inside corner, installation, jamb, outside corner, sill, top of wall, top-of-wall tie-in, wall-to-soffit, window head, window jamb and window sill. A BIM object for the M-42 and M-36 panel is also published.