It is important to note that many people feel that elevated radon concentrations within a home can simply be fixed by sealing cracks and openings in the lowest level of the home. Using this approach as a stand-alone method to lower radon concentrations is not recommended and rarely effective. That stated, sealing openings can greatly enhance the effectiveness of a radon mitigation system.

To ensure high radon levels have been successfully addressed, homeowners should always test, or have a contractor test the home after any radon mitigation system is first activated to make sure it is working effectively.