How can I check my contractor’s work?

  • Radon reduction systems must be clearly labeled.  This will avoid accidental changes to the system which could disrupt its function.
  • The exhaust pipe(s) of soil suction systems must vent above the surface of the roof and 10 feet or more above the ground, and at least 10 feet away from windows, doors, or other openings that could allow the radon to reenter the house, if the exhaust pipe(s) do not vent at least 2 feet above these openings.
  • The exhaust fan must not be located in or below a livable area. For instance, it should be in an unoccupied attic of the house or outside – not in a basement!
  • If installing an exhaust fan outside, the contractor must install a fan that meets local building codes for exterior use.
  • Electrical connections of all active radon reduction systems must be installed according to local electrical codes.
  • A warning device must be installed to alert you if an active system stops working properly. Examples of system failure warning devices are: a liquid gauge, a sound alarm, a light indicator, and a dial (needle display) gauge. The warning device must be placed where it can be seen or heard easily. Your contractor should check that the warning device works. Later on, if your monitor shows that the system is not working properly, call a contractor to have it checked.
  • A post-mitigation radon test should be done within 30 days of system installation, but no sooner than 24 hours after your system is in operation with the fan on, if it has one. The contractor may perform a post-mitigation test to check his work and the initial effectiveness of the system; however, it is recommended that you also get an independent follow-up radon measurement. Having an independent tester perform the test, or conducting the measurement yourself, will eliminate any potential conflict of interest. To test the system’s effectiveness, a 2-7 day measurement is recommended. Test conditions: windows and doors must be closed 12 hours before and during the test, except for normal entry/exit.
  • Make sure your contractor completely explains your radon reduction system, demonstrates how it operates, and explains how to maintain it. Ask for written operating and maintenance instructions and copies of any warranties.