Structural · S-ZJ4RB

CMU Wall Opening and Reinforcement Detail

Materials

Elements

Walls Arches Reinforcing Roof / Floor Openings

About this detail

Structural framing and reinforcing requirements apply to penetrations and openings within a concrete masonry unit wall. Openings must be sized in half-block modules in width and full-block modules in height, with a maximum size of twenty-four inches in diameter unless noted otherwise. Wall reinforcement stops at the opening, and trim bars are added to each side to match the size and quantity of primary reinforcing bars interrupted by the penetration. A minimum of two number five bars are required on each side, extending two feet beyond the edge of the opening. Openings smaller than sixteen inches require no additional reinforcing unless distributed reinforcement is interrupted. Clusters of small holes whose overall measurement exceeds one foot must be reinforced as a single opening, and any unshown openings must be brought to the structural engineer of record prior to performing work.

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