Structural · S-EC847

Typical Steel Deck Openings and Framing Reinforcement

Materials

Elements

Beams Roofs Decks Reinforcing Roof / Floor Openings

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Standard structural framing and reinforcement configurations for ductwork, piping, roof hatches, and small air shafts cutting through steel floor or roof decks. Openings sized from 6 inches to 24 inches utilize L2x2x1/4 angles below the deck with 5/8-inch diameter fasteners. Openings from 24 inches to 72 inches are framed with C3x4.1 channels, while larger openings from 72 inches to 98 inches require C4x5.4 channels. Deck flutes are adjusted as required to achieve proper bearing on the framing channels. Note that holes less than 6 inches in diameter cutting no more than one deck web require no reinforcement, and these reinforced openings are not intended to support mechanical equipment.

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