Structural · S-87HFJ

Typical Composite Deck - Small Openings (X ≤ 2'-0")

Materials

Concrete Composite

Elements

Floors / Slabs Decks Reinforcing Roof / Floor Openings

Connections

Shear Stud / Composite Deck Attachment

About this detail

Small core-drilled or blocked-out penetrations through composite concrete and metal deck slabs require specific rebar placement and minimum clear spacing to maintain structural load paths. Single openings between six inches and two feet wide utilize one number four bar perpendicular to the deck flute placed one inch clear above the deck and one number four bottom bar parallel to the deck with one inch clear from the bottom of the nearest deck flute. Grouped small openings require a minimum center-to-center spacing of four times the maximum opening dimension from adjacent penetrations, or must be reinforced as a single combined opening. Isolated openings under six inches typically require no added reinforcing. Contractors must coordinate all penetration sizes and locations with architectural, mechanical, electrical, and plumbing trades prior to concrete placement.

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