Mechanical · M-BAZ76

Rooftop Unit Mounting and Vibration 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 twenty-four-and-a-half-inch high insulated roof curb supports the rooftop mechanical unit. A vibration isolation curb features Caldyn CQA style vibration isolators within a ten-gauge isolation rail. A wood nailer is secured atop the curb to receive twenty-six gauge galvanized sheet metal counter flashing, which is nailed in place. The unit base rail, constructed from fourteen-gauge steel and fitted with a sealing gasket, connects to the isolation rail and is anchored using twelve-gauge hold-down brackets secured by four number-twelve by one-inch tek screws per long side. An additional ten-gauge channel runs beneath each isolator outside the curb, welded at each end to the curb flanges.

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