After Mitigation

A quick check to confirm your system is built correctly and within national standards.
Check Your Contractors Work
​A radon system is only effective if it’s installed correctly, and a quick visual check helps you confirm that your home is actually being protected the way you paid for. Most installation issues are simple to spot — a misplaced fan, an unsealed penetration, or a discharge point that’s too low — and catching them early prevents months or years of reduced performance. 
This step isn’t about second‑guessing your contractor; it’s about giving your family confidence that the system is built to standard and ready for its post‑mitigation test.
​Simple Checks That Confirm Your System Was Installed Properly:
  • Radon reduction systems must be clearly labeled. This will avoid accidental changes to the system that could disrupt its function.​
  • The exhaust pipes of soil suction systems must vent above the surface of the roof and 10 feet or more above the ground, and must be at least 10 feet away from windows, doors or other openings that could allow radon to reenter the home, if the exhaust pipes 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 installed in unconditioned space.
  • 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. 
  • A post-mitigation radon test should be done by the contractor 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. 
  • 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.