Radon Mitigation Episodes

Lee Gilliam rebuilds a coastal Massachusetts driveway with reclaimed stone edging and a 3-inch layer of local shells, keeping the hardpack base intact. Ross Trethewey and a certified mitigator diagnose a 100-year-old slab with grab samples and a manometer, then install a sub-slab depressurization system with an exterior fan wired by Heath Eastman.