Keeping water from entering below your concrete slab can be a big help in preventing cracking and/or failure of the concrete system. Over time you may have noticed in your driveway that you have cracks in the joints of the concrete, these joints are called control joints, and they are installed in hopes that if the system does crack, it will crack in that joint, thereby controlling the way the crack looks. If control joints did not exist, you would possibly have cracks that w