Structural · S-K5MCE

Reinforcement for Isolated Openings

Materials

Elements

Floors / Slabs Reinforcing Roof / Floor Openings

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Reinforcement requirements for isolated rectangular, round, or square slab openings ranging from one to three feet in size. Trim bars consisting of a minimum of one number five bar are required on all sides and each face of the opening, providing at least half the equivalent area of the disrupted principal reinforcement in each direction. Standard lap splices and clear cover per general notes apply at all intersecting reinforcing bars. Openings smaller than one foot that do not disrupt principal reinforcement require no trim bars, while larger openings exceeding three feet must be sized per structural plans.

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