You should cut control joints in concrete to a depth of about one-quarter to one-third of the slab’s total thickness. This depth ensures that the joint effectively controls cracking as the concrete cures and contracts. For instance, if you’re working with an 8-inch concrete slab, the saw cuts should reach approximately 2 to 2.7 inches deep. Maintaining this ratio helps direct shrinkage stress into the joints, minimizing the risk of random or uncontrolled cracks across the surface.

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