How is radon usually reduced?
The most common method is active sub-slab depressurization.
A pipe passes through the foundation slab and connects to a small fan. The fan draws radon-containing soil gas from beneath the home and discharges it outside before it can enter the living space.
Crawlspaces, multiple slabs and complex foundations may require a different or combined approach. The assessment determines what fits the house.
Is sealing cracks enough?
Sealing can support a system, but it is generally not an effective stand-alone fix.
Health Canada research found that active soil depressurization produced much larger average reductions than sealing entry routes alone. Sealing may improve system performance and limit air movement, but it should not be presented as a universal solution.
What happens during an assessment?
- The professional reviews the test report and how the measurement was taken.
- They identify the home’s foundation types, additions, crawlspaces and accessible routes.
- Diagnostic testing helps determine whether pressure can be extended beneath the slab.
- They plan suction points, fan size, pipe routing, electrical needs and a safe exhaust location.
What happens after installation?
The system should include a way to show that it is operating. Post-mitigation measurement confirms whether the radon level has been reduced. Health Canada recommends re-testing active systems periodically, including every five years, and after major changes that may affect the home’s air movement.
Why professional qualifications matter
Health Canada recommends a C-NRPP-certified radon mitigation professional.
C-NRPP provides Canadian training and certification for radon measurement and mitigation. Check a provider’s current status directly rather than relying on an unsupported website claim.