Architectural · A-AZNXQ

Mechanical Duct Curb and Flashing Detail

Materials

Elements

Roofs Waterproofing / Flashing Site / Paving

About this detail

A 4x12 treated wood curb is secured with lag screws to wood framing below, set over a built-up roofing system with plywood sheathing and a perlite cant strip. A twenty-four gauge galvanized sheet metal flashing, soldered all around and set in butyl tape, wraps the curb and is secured with fasteners spaced at twelve inches on center using neoprene washers. The mechanical duct connects to the curb with duct sealer or mastic applied before sliding the clip onto the duct and flashing, with complete sealing all around. An alternate detail features flashing at round ducts incorporating twenty-two gauge galvanized sheet metal flashing, a draw band, and sealant.

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