How To Prevent Concrete Cracks in Control Joints and Isolation Joints? Are you seeing cracks on concrete slabs, floors, or pavements along the joints? These are control joints, designed to manage natural concrete movement. But when they’re not sealed properly, water intrusion, dirt buildup, and heavy loads can quickly damage your concrete. The result? Concrete spalling, surface unevenness, structural weakness, and costly repairs. Many construction failures happen because of wrong sealant applica