Structural · S-686Y7

Typical Slab on Grade Joint Details

Materials

Elements

Floors / Slabs Expansion / Control Joints Entrances

About this detail

Concrete slab on grade joints are detailed with specific depth ratios and reinforcement requirements for construction joints, saw-cut control joints, and pour-back strips. Construction joints feature a keyed or straight vertical edge with a one-eighth-inch radius on each side, maintaining a depth of zero-point-fifteen times the slab thickness. Saw-cut control joints are specified with an early entry saw as soon as final set is achieved within four to six hours of the pour, reaching a depth of zero-point-twenty-five times the slab thickness or one-third of the total thickness. Pour-back strip configurations indicate a width of three feet or seven feet with number-four reinforcing bars at eighteen inches on center each way, extending a minimum of twenty-four inches into the strip. Slab reinforcement throughout consists of number-four bars at eighteen inches on center each way placed at zero-point-thirty times the slab thickness from the top.

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