Mechanical · M-CQA5T

Roof Mounted Equipment Curb and Gooseneck Penetration Detail

Materials

Steel

Elements

Roofs Decks Waterproofing / Flashing Insulation Site / Paving Connections / Plates Roof / Floor Openings

Connections

Deck Attachment

About this detail

A roof curb and gooseneck pipe penetration assembly mounts over a roof deck and rigid insulation system. The wood nailer curb features preservative treated framing and shims sized to match the insulation depth, with a minimum eight-inch clearance from the roof surface to fasteners and ten inches minimum to the top of the curb. A fully adhered roofing membrane extends up and over the top of the curb, secured with seam plates and fasteners spaced at twelve inches on center into studs, and nailed off at six inches on center on the inside of the curb. Ducted mechanical equipment fastens to the side of the curb with a minimum of two high-domed, capped, gasketed fasteners per side. Flexible electrical lines enter the building through a gooseneck pipe with a premanufactured boot flashing, maintaining an eighteen-inch minimum clearance from curb to penetration. Walk pads are provided on all four sides of serviceable equipment, and all gaps between the duct and curb are filled with insulation equivalent to the roof system R-value.

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