Structural · S-N9SRG

Typical Steel Deck Openings

Materials

Steel

Elements

Beams Roofs Decks Connections / Plates Reinforcing Roof / Floor Openings

Connections

Welded Connection Deck Attachment

About this detail

Steel deck openings up to 12 inches require a 12-gauge strengthening plate welded with 1 1/4-inch long 3/8-inch seam welds at 6 inches on center along the ridges, along with 1/2-inch diameter puddle welds at each rib. Openings between 12 and 24 inches utilize L3x3x1/4 angles on each side furnished and installed by the deck contractor, extended and fastened to two ribs beyond the opening. Openings from 24 to 60 inches use L6x4x3/8 angles framing around the opening supported by wide flange or steel joist beams. These reinforced openings are not intended to support mechanical equipment unless coordinated with specific structural details.

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