Mechanical · M-PEG6J

Gooseneck Discharge Hood and Roof Curb Detail

Materials

Steel Stainless Steel Glass / Glazing Metal (misc.)

Elements

Roofs Ceilings Floors / Slabs Waterproofing / Flashing Insulation Site / Paving Anchors / Embeds Reinforcing Roof / Floor Openings

About this detail

A gooseneck discharge hood penetrates a roof assembly through an insulated roof curb. The stainless steel hood features a minimum thickness of twenty gauge, a radius-to-diameter ratio of one point zero, a fifteen-degree angle, and lacks a birdscreen for dryer vent discharge. The duct is sized per the floor plan and insulated with two inches of rigid glass fiber insulation and a vapor barrier from the roof penetration through the above-ceiling space. A continuous sheet metal lines the inside of the curb, while the roof membrane is flashed and counterflashed for a watertight installation. The roof curb is anchored to the structure to resist wind and seismic forces, coordinated with architectural and structural criteria, and paired with an insulated curb coordinated with the roof insulation thickness.

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