The Vibro-Curb available from Thybar Corp. provides mounting for rooftop HVAC units. The company says it has integral, vibration dampening, spring isolators that may be easily accessed. The curbs roofing may be completed at a later date without disturbing the unit which helps to eliminate extra crane or helicopter expenses. A 2-by-2 wood nailer is provided for attaching roofing felts. The flexible 9-inch counter-flashing provides a weather seal while permitting access to the isolators. Roofing around spring access ports is not required with the Vibro-Curb. Thybar representatives claim that a minimum 90 percent isolation efficiency is achieved with the isolators. They are custom sized and spaced to accommodate the rooftop unit’s weight and center of gravity for optimum vibration dampening. Deflections of 1-, 2-, or 3 inches may be provided. Vertical limit stops eliminate excessive movement caused by wind loads and seismic activity.

Thybar Corp., 913 S. Kay Ave., Addison, IL 60101; (800) 666-CURB; fax (630) 543-5309; www.thybar.com.