PAC-100 (1" Mechanical Seam Panel with optional in-seam sealant)

180° Double Lock



  • 35-year non-prorated finish warranty
  • Available in four panel variations; smooth, striated, pencil rib or flat rib. Check locally for panel variation availability
  • Corrective leveled coil
  • Maximum panel length of 64' when factory- or shop-formed but virtually unlimited when field-formed
  • Mechanically seamed in the field to 180°
  • 38 stocked metal colors (24 gauge steel)
  • 16 stocked metal colors (22 gauge steel)
  • 37 stocked metal colors (.032 aluminum)
  • 20 stocked metal colors (.040 aluminum)
  • Galvalume Plus available


PAC-100 Standing Seam Metal Roofing Panels combine semi-structural metal panel performance with architectural roofing panel aesthetics. PAC-100 roofing coil is corrective-leveled to provide superior panel flatness. An optional factory-applied sealant bead can be applied for additional weather resistance. Maximum panel length is limited when factory- or shop-formed but virtually unlimited when field-formed; minimum panel length is approximately 4 feet.

PAC-100 roofing panels feature the ever popular 1″ leg height which requires mechanical field seaming to 180°. Panels have a concealed-fastener clip designed to allow for maximum design flexibility. For further details, please contact Petersen Aluminum.


All flashing and trim will be fabricated by manufacturer or qualified fabricator. Flashing shall be PAC-CLAD aluminum (.032-.063 gauge as specified) or PAC-CLAD steel (24 ga. or 22 ga. as specified). A 35-year, non-prorated finish warranty can be supplied covering metal finish performance. Vinyl masking is recommended on all fabrication applications where extra handling is expected. NOTE: The Strippable film must be removed immediately after installation.


PAC-100 roofing panels are intended for use in architectural and semi-structural roofing. Substrates may include 1/2″ (min.) plywood, nailboard insulation or equal with an underlayment of ice and water shield or 30# (min.) roofing felt applied horizontally from eave to ridge. Other substrates may include metal decking, purlins or rigid insulation in conjunction with bearing plates. Consult your local building code for compliance limitations.

A minimum 1/2:12 pitch is required. Contact Petersen Aluminum for further detail assistance. For coastal applications, aluminum panels along with stainless steel clips must be used for warranty. Consult a local architect/engineer for compliance with local codes and conditions.

PAC-100 Roofing Panels

PAC-100 roofing panels can be field- or factory-formed to length and designed to be field-seamed to 180°. This panel combines an attractive thin-rib profile with superior structural performance. PAC-100 panels are designed for application over a variety of substrates in slopes as low as 1/2:12 pitch. PAC-100 roofing panels are available in a variety of widths. Materials available include: 22 and 24 gauge steel; .032 and .040 aluminum.

PAC-100 Seaming

The PAC-100 electric seamer can only run in one direction at 180°. The PAC-100 panels should be installed from left to right to ensure the seamer travels down slope. Do not expect the seamer to travel up slope easily on a roof pitch greater than 4:12.


PAC-100 panels require the use of mechanical seamers, which are available along with hand crimpers and other tools through D.I. Roof Seamers, which is the only supplier of this equipment approved by Petersen Aluminum. For more information Click Here.


PAC-100 panel assemblies are extensively tested to meet the country’s most stringent building requirements, including Miami-Dade and the Florida Building Code.


NOTE: Not all stiffening options are available at all locations - actual appearance may vary slightly.
PAC-100 - 180° Double Lock
NOTE: Not all stiffening options are available at all locations - actual appearance may vary slightly.