Structural · S-8VZMM

Rooftop Unit Frame and Steel Beam Support Detail

Materials

Steel Metal (misc.)

Elements

Roofs Floors / Slabs Decks

Connections

Welded Connection Bolted Connection

About this detail

Framing connection for a rooftop unit supported by HSS columns and steel beams over a slab and metal roof deck assembly. The hollow structural section members, sized as HSS5.000x0.312, connect to the underlying W27x steel beams using base plates secured with four one-half-inch diameter A235-X high-strength bolts per location. The rooftop unit frame attaches to the support framing using ten one-half-inch diameter galvanized machine bolts, with five bolts per side minimum. Welded connections include quarter-inch fillet welds and complete joint penetration welds with backgouge at the angle-to-flange junctions. Additional connection plates include three-eighths-inch by six-and-a-half-inch plates at the top and bottom with one-half-inch A325-SC high-strength bolts.

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