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Concrete cracks. That is the nature of the beast. Shrinkage that occurs during the drying stage causes stresses and cracking in the concrete. Joints are placed in the concrete to control the location of the cracks and prevent unsightly random cracking. Typically, joints are placed in concrete every 2.5 to 3 times in feet the depth of the concrete in inches. For instance, a four inch slab should have joints every 10 to 12 feet. Joint depth should be at least a quarter the depth of the slab. A 4" slab will require 1" deep joints to be effective.
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Why are joints required in concrete?
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