Structural · S-NET6N

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

Framing for a rooftop mechanical unit opening is supported by open web steel joists or steel beams as sized per the plans. The curb is framed with L6x4x5/16 angle sections placed with long leg vertical, reinforced by L3x3x1/4 angles around duct openings and connected with typical 3/16 fillet welds. Where the mechanical unit spans two joist spaces, the horizontal leg of the L6x4 angles is trimmed accordingly. Solid blocking or HSS1.1/2x1.1/2x3/16 by 0'-4" sections tack welded to the steel deck are provided under the mechanical unit curb. The roof deck is welded to the supporting angle framing, with alternative L5x3x1/4 angles permitted when the mechanical unit weighs less than 700 pounds.

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