Radon enters your home through the path of least resistance, similar to water. Based off of this, we believe that crack sealing is vital to radon mitigation and is an important step in performing and professional and complete install. Not only does it inhibit radon from coming through those cracks, but once we apply suction with our fans underneath the concrete, sealing the cracks will help to increase the amount of vacuum and reach we can get. Similar to blowing up a balloon with small holes in it, but vice versa.