Architectural · A-DER38

Roof Penetration and Flashing Detail at Steel Columns

Materials

Steel Stainless Steel Timber / Wood Aluminum Gypsum / Drywall

Elements

Columns Beams Stairs Railings / Guards Roofs Waterproofing / Flashing Connections / Plates Reinforcing

Connections

Welded Connection

About this detail

These details show the roof penetration and waterproofing assembly for steel posts, stair columns, and davit stanchions intersecting a roof deck. The structural steel framing connects to the structural drawings below, supporting posts that pierce through five-eighths-inch Type X gypsum sheathing, cover boards, vapor retarders, and directly adhered PVC membrane roofing. Pressure-treated blocking provides membrane attachment as required by the roofing manufacturer for warranty. Waterproofing around each post utilizes a two-piece flashing boot secured with a flashing membrane, stainless steel hose clamps, elastomeric joint sealant, aluminum tape, and a hot-air welded PVC joint.

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