Architectural · A-96YMS

Rooftop Equipment Curb and Flashing Detail

Materials

Steel Timber / Wood Metal (misc.)

Elements

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

Connections

Welded Connection Deck Attachment

About this detail

A pre-manufactured roof curb is secured to double two-by pressure-treated wood blocking and a structural steel angle bearing on a metal deck. The metal deck flutes are filled at the top and bottom with an air barrier membrane running the full length of the curb. An air barrier membrane wraps the steel angle, while a roofing membrane extends up the side of the curb, secured with fasteners and plates spaced at a maximum of twelve inches on center. A hot air weld extends at least one and one-half inches beyond the fastening plates. Metal counterflashing drops down from the rooftop equipment over the roofing membrane. The top of the curb maintains a four-inch minimum clearance to the cricket, and an eight-inch minimum clearance from bottom of flashing to top of cricket as required by the roofing and equipment manufacturer.

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