Is it practical and effective to seal all openings in a foundation as a stand-alone technique for radon mitigation?

Sealing all openings in a foundation as a stand-alone technique for radon mitigation is not considered practical and effective. While sealing can help reduce radon entry, radon mitigation typically requires a multi-faceted approach for it to be effective.

Radon is a naturally occurring radioactive gas that can enter homes through various pathways, including cracks in floors and walls, construction joints, and gaps around service pipes. Simply sealing these openings can limit some entry points but may not address all pathways through which radon can infiltrate. Moreover, sealing alone can create a situation where radon accumulates in areas within the home because it cannot escape, potentially increasing indoor radon levels if other mitigation measures are not implemented.

Effective radon mitigation often involves not just sealing, but also the installation of systems such as active soil depressurization, which actively reduces radon levels by using a fan to draw radon from beneath the foundation and vent it outside. This comprehensive approach not only limits radon entry but also helps ensure that indoor air quality is maintained at acceptable levels. Therefore, relying solely on sealing without considering the dynamics of radon movement and the need for proper ventilation can lead to insufficient radon mitigation.