Mechanical · M-QF5R7

Duct Support at Roof Detail

Materials

Steel Glass / Glazing Metal (misc.)

Elements

Roofs Decks Waterproofing / Flashing Connections / Plates

Connections

Bolted Connection

About this detail

A duct support assembly mounts to a metal deck roof system. The support structure uses 1 1/2-inch diameter schedule 40 galvanized steel piping secured with threaded pipe caps and 3/8-inch diameter U-bolts, attached via an L3x2x3/16 angle member. The base plate assembly includes a 3/16-inch steel plate spanning three full metal deck cells, supported by a 10-gauge channel filler shaped to match the cell profile and a channel between framing. Attachment to the roof structure utilizes 3/8-inch diameter through bolts with washers, nuts, and beveled washers. Weatherproofing at the penetration is achieved with a 24-gauge sheet metal flashing and counter flashing, roofing run up and under the counter flashing, and sealant applied all around.

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