Architectural · A-Z98S7

Fabricated Penetration Flashing

Materials

Timber / Wood Glass / Glazing Metal (misc.)EIFS / Plaster / Stucco

Elements

Walls Waterproofing / Flashing Roof / Floor Openings

About this detail

A fabricated penetration flashing assembly is integrated into an exterior cement plaster wall with metal lath and weather-resistive barrier over exterior wall sheathing. A varying round or square penetration passes through the assembly with a sheet metal escutcheon flashing, backer rod, and continuous sealant fillet at the joints. Nine-inch wide self-adhering flashing is applied under the bottom flange and over the flange at the top and sides, supplemented by non-adhesive flashing fastened at the top edge. A Z-metal end closure with a sloping sheet metal profile manages moisture drainage around the penetration. Sheathing gaps of one-eighth inch or less require no foam, while gaps greater than one-eighth inch are filled with low-expansion urethane foam shaved flush with the sheathing.

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