Structural · S-DE3K7

Roof Opening Framing and Curb Support Detail

Materials

Steel Timber / Wood

Elements

Beams Roofs Decks Arches Site / Paving Roof / Floor Openings

Connections

Welded Connection Deck Attachment

About this detail

Structural steel framing for a roof opening supporting a mechanical unit curb consists of open steel beams and angle framing sized per plans. An angle frame of L6x4x5/16 with long leg vertical runs continuously under the curb, with horizontal legs trimmed around duct openings as required. Where mechanical units span two joist spaces, the horizontal leg of the supporting angles is trimmed. Additional framing includes L3x3x1/4 angles around duct openings and three-sixteenths inch fillet welds typical for connections. The roof deck is welded to the angle framing, and the flutes of the steel deck under the curb are solid-blocked using a hollow structural section HSS1.1/2x1.1/2x3/16 by zero-foot-four-inches tack-welded to the steel deck or using solid blocking connected to the deck. For mechanical units weighing less than seven hundred pounds, support angles may be reduced to L5x3x1/4.

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