VMC Group Steel Dunnage Platforms are customized structural steel platforms that are unitized to support large equipment. Dunnage platforms are designed for intermediate support between the equipment and rooftop steel. Dunnage platforms can be supplied galvanized or factory assembled with seismic isolators pre-attached and provide continuous support underneath rooftop equipment.

The isolator housings are identical in height within each series and come with easily accessible bolt holes for simplified installation. An elastomeric acoustical cup eliminates high frequency vibration, while color-coded springs permit ease of identification of load capacity. Spring housings have internal adjustments for use in most seismic and wind applications. Their rugged steel housing is designed to handle high wind and high seismic forces up to 2.0g.

Features & Benefits

  • Unitized
  • Rig platform with isolators pre-attached
  • Provide continuous support for rooftop equipment
  • Seismic capacity up to 2.0g
  • International Building Code® (IBC) compliant


  • Cooling towers
  • Air-cooled condensers and condensing units
  • Rooftop air handling units
  • Other large rooftop equipment




The engineers we employ hold the highest industry-recognized credentials in structural analysis, elastomer development and system dynamics.


We are the first ISO accredited PCA ISO-17065, third-party certification body for special seismic certification of non-structural building components and their mounting configurations by the ICC’s International Accreditation Service.

Test & Measurement

We are the only ISO 17025:2005 Accredited Seismic Simulation Test Laboratory with a triaxial shake table owned and operated by California licensed Structural engineers.

Testing Services Update
DCL now offers Nuclear Qualification and Testing services.

In partnership with Greenberry Industrial, we now offer testing services that meet the requirements of ASME NQA-1.

Call for more information.