Structural · S-3NST6

Roof Opening Framing for Mechanical Unit

Materials

Steel Timber / Wood

Elements

Beams Roofs Decks Arches Site / Paving Roof / Floor Openings

Connections

Welded Connection Deck Attachment

About this detail

Roof opening framing for a mechanical unit is supported by open steel beams and steel deck. The assembly uses L6x4x5/16 angle frames placed under the curb, with L3x3x1/4 angles trimming around duct openings. A three-sixteenths inch fillet weld secures the roof deck to the angle framing. Where the mechanical unit spans two joist spaces, the horizontal leg of the L6x4 angle is trimmed. Additional notes specify that units weighing less than 700 pounds may substitute L5x3x1/4 support angles, and steel deck flutes under the curb must be solidly blocked using HSS1-1/2x1-1/2x3/16 by 0'-4" sections tack welded to the deck.

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