Mechanical · M-X8Z28

Rooftop Unit Mounting and Vibration Isolation Curb Detail

Materials

Steel Timber / Wood

Elements

Roofs Waterproofing / Flashing Insulation Millwork / Casework Site / Paving Roof / Floor Openings

Connections

Base Plate / Anchorage Welded Connection

About this detail

A rooftop equipment unit casing sits on a fourteen gauge steel unit base rail, which is sealed with gaskets and secured with four number twelve by one inch Tek screws into twelve gauge hold down brackets. A ten gauge isolation rail with seven and a half inch deep flanges houses vibration isolators resting on a twenty-four and a half inch high insulated roof curb. A wood nailer tops the curb, receiving twenty-six gauge galvanized sheet metal counter flashing nailed in place. Additional ten gauge channels are welded to the curb flanges beneath each isolator to transfer loads.

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