Structural · S-BR6F5

Slab Opening Trim Reinforcement Detail

Elements

Floors / Slabs Reinforcing Roof / Floor Openings

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Concrete floor and roof slabs require supplemental reinforcing around penetrations twelve inches or greater in size. Reinforcing bars are placed approximately two inches from the edge of the opening typically, with four inches of clear spacing maintained between parallel bars where dual reinforcing is required. Opening sizes between eleven inches and eighteen inches receive one number five bar on each side, while openings from eighteen inches to two feet six inches receive one number five top and bottom on each side, and openings two feet six inches and larger receive two number five top and bottom on each side. Additionally, diagonal trim bars at mid-depth span four feet for openings under four feet and six feet for openings over four feet. All trim reinforcing is in addition to any reinforcing indicated on the structural plans.

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