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P Series Curbs are high quality, structural tubular steel support systems for rooftop unit vibration isolation abatement. Each custom-built unit incorporates both the roof curb and spring isolation into one complete structure. VMC engineers design each curb to custom fit any rooftop mechanical equipment. 

P6100 1" Spring Isolation Curbs can be specified to compensate for large floor spans, and spring pockets are positioned within the curb at the correct load points for proper support. All spring pockets incorporate a minimum 1/4" elastomeric cup or pad in series with the spring to provide optimum isolation efficiency.  

The curb and rooftop unit can be fully installed and adjusted before the roof is sealed. 

Spring pockets are accessible from around the outside of the curb. All springs are color-coded for ease of identification, and any spring can be removed and replaced while the rooftop unit is installed. Once adjusted and leveled, the rooftop unit becomes free floating - completely isolated from the building structure, while completely restrained to it.

Features & Benefits

  • Upper frame supports equipment while "flating" on spring isolators
  • Factory installed top flashing ensures a weather-tight installation
  • Curb can be manufactured to any height by increasing spring stanchion height
  • Duct supports installed to match manufacturers dimensions
  • Spring pockets are fully adjustable and offer 1" deflection (P6100), 2" deflection (P6200) or 3" deflection (P6300). All pockets are seismically rated to ensure equipment captivity
  • Expanded metal provides backing and attachment location for 2" thick insulation (insulation provided by the roofer)

Applications

  • HVAC rooftop equipment such as RTU's and fans

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Engineering

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

Certification

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.