Structural · S-5A84S

Reinforcing At Structural

Materials

Concrete

Elements

Floors / Slabs Reinforcing Roof / Floor Openings

Connections

Rebar Splice / Development

About this detail

Square, rectangular, or round slab openings up to four feet in maximum dimension require specific corner reinforcing and replacement bars for all interrupted top and bottom slab reinforcement. Two number five bars are placed diagonally at the mid-depth of the slab at each corner of the opening, extending two feet six inches typically on each side. Additional replacement reinforcing equal in area to the interrupted bars is split evenly on each side of the opening and extended past the edges to achieve a class B lap splice. Boxed-out openings, boxed recesses, and pipe sleeve clusters must all adhere to these framed slab opening requirements with typical one and a half inch clearances.

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