Mechanical · M-Z3QPE

Air Handling Unit Curb Support and Isolation Detail

Materials

Concrete Steel Stainless Steel Metal (misc.)

Elements

Roofs Decks Waterproofing / Flashing Insulation Millwork / Casework Site / Paving Anchors / Embeds Connections / Plates Roof / Floor Openings

Connections

Bolted Connection Deck Attachment Embed Plate

About this detail

An air handling unit casing is supported on a flat and level concrete curb over a metal roof deck with rigid foam insulation. The unit frame rests on two layers of three-quarter-inch neoprene pads separated by a one-sixteenth-inch thick stainless steel plate. A hot-dipped galvanized steel angle and formed C-channel secure the frame with seven-eighths-inch diameter Hilti TZ anchor bolts having a minimum six-inch embedment. Weather-tight sealant is applied typically at the anchor locations. Roof flashing, counterflashing, and tapered roof insulation tie into the concrete curb to maintain weatherproofing.

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