Architectural · A-E9J33

Roof Expansion Joint and Drain Assembly

Materials

Elements

Columns Beams Walls Roofs Decks Bracing Expansion / Control Joints Waterproofing / Flashing Insulation Drainage Connections / Plates Roof / Floor Openings

Connections

Expansion / Slip Connection

About this detail

The roof expansion joint assembly features a single-ply roofing membrane carried up and over a foam rod sized one-and-a-half times larger than the expansion joint. The assembly rests on two-by-four pressure-treated wood nailers, two-inch fiberglass insulation filler, and a continuous neoprene closure spanning the opening atop a structural steel beam. Adjacent roof drainage details show roof drains and overflow drains installed with rigid insulation, single-ply membrane, roof sheathing, and tapered insulation leading to a two-inch collar at overflow drains. Notes specify that the plumbing contractor must install all roof drain assemblies, counterflashing, and underdeck clamps, while heavy-duty Hubb bands are required for all roof drain to PVC pipe connections.

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