Structural · S-NBCYA

Condition Where Reinforcing Is Not Required

Materials

Concrete Steel Metal (misc.)

Elements

Beams Floors / Slabs Decks Anchors / Embeds Reinforcing Roof / Floor Openings

Connections

Bolted Connection Deck Attachment Timber / Mass-Timber Connection

About this detail

Unreinforced openings in concrete over metal floor decks are framed using 2-1/2 by 2-1/2 by 1/4 inch angles installed before coring. The angles attach to the metal deck using 1/2 inch diameter Simpson Titen HD screws, 1/2 inch diameter Powers wedge bolts, or 1/2 inch diameter Hilti Kwik Bolt expansion anchors spaced at 12 inches on center with 4 inches maximum embedment. Core drill each corner and saw-cut between for cored openings, maintaining specified clearances from beams or joists. Spacing between adjacent openings must be at least 32 inches or four times the larger opening dimension, otherwise the group requires reinforcing as a single opening.

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