Architectural · A-VZP3X

Roof Drain with Overflow Plan and Penetration Detail

Materials

Steel Stainless Steel Timber / Wood Aluminum Gypsum / Drywall

Elements

Roofs Waterproofing / Flashing Drainage Roof / Floor Openings

Connections

HSS Connection Welded Connection

About this detail

The assembly features a roof sump box accommodating a roof overflow drain and a storm drainage piping specialty with a rim elevation two inches above the main drain rim. A hollow structural section vertical support penetrates the roof assembly, sealed with elastomeric joint sealant applied to a clean surface and secured by an eight-inch minimum stainless steel hose clamp. The penetration is wrapped with an adhered polyvinyl chloride square tube flashing membrane and hot-air welded base flashing over five-eighths-inch Type X gypsum sheathing and a vapor retarder. Wood blocking nailers of eight inches minimum are provided where the penetration width exceeds twelve inches, with aluminum applied as required for contaminated existing penetrations.

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