Structural · S-6ZP5P

Roof Opening Frame 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

Structural steel framing around a roof opening for a mechanical unit supported by open steel beams sized per plans. The curb opening is framed with typical L6x4x5/16 angles with long legs vertical, augmented by an L3x3x1/4 angle trimmed around duct openings. Three-sixteenth-inch fillet welds secure the angle framing, and the roof deck is welded to the angle framing. Where a mechanical unit spans two joist spaces, the horizontal leg of the L6x4 angles is trimmed, and support angles may be reduced to L5x3x1/4 for units weighing less than 700 pounds. Steel deck flutes under the mechanical unit curb are solid blocked using either an HSS1-1/2x1-1/2x3/16 by zero-foot-four-inch section tack welded to the steel deck or solid blocking connected to the deck.

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