If you have high levels of radon, you will need professional assistance. If the levels are only slightly elevated, you may consider some of these options:

  • Sealing Concrete: This temporarily reduces radon levels in a home.
  • Close Foundation Cracks: If there are visible cracks and other visible openings in the foundation, use calk to close them.
  • Make Sump Pumps Airtight: Do this by using an airtight cover that still allows access to the sump pump, if necessary.
  • Use Polyurethane Plastic Sheeting: Cover exposed soil in crawl spaces with this material. Attach the sheet to the walls and aim for a thickness of 6 millimeters.

If these methods do not lower radon to acceptable levels, consider hiring experienced professionals.