After wet curing is complete, the floor slab is cleaned and a densifier is applied to complete the work. When the concrete is cast the placing slump is approximately 6-1/2 inches.

Option 2 Allow slabs to crack randomly but control crack widths with steel reinforcing bars or welded wire reinforcement. Typically, contraction joints are not installed with this option.

Cut in control joints to create individual sections no larger than 8 x 8 ft. for a 3-1/2-in.-thick slab, and no larger than 10 x 10 ft. for a 5-1/2-in.-thick slab.

Create control joints about every 5-6 feet to minimize cracking. These should be equal to ¼ the slab depth (for example, 1 inch deep for a 4-inch slab or 1 ½ inch for a 6-inch slab.) ...

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Joints should be at least 1/2-inch to 3/4-inch wide. Expansion joints should extend beyond the full depth of the concrete slab. Use a screwdriver to confirm that each joint at least 4-inches deep.

These joints are placed throughout the concrete where the slab meets a building and also where a slab meets another slab. It allows the concrete to move without leaving the stress on the concrete.