What is a Radon Mitigation System?

Following the technical procedures recommended by the National Radon Competence Program in Canada (NRCP-C), an effective mitigation system can remove radon from the outdoors before it enters a property. Once dissipated into the outdoor air, radon is not a health hazard.

Any radon gas mitigation system must be designed and installed by a certified NCRP-C professional, depending on the particular characteristics of the contaminated property. A system can be installed in these locations

A mitigation system will be effective in all types of buildings, given that the design and installation is supervised by an NCCRP-C professional. 

How does radon get into your home?

Radon is an invisible, odorless, tasteless gas that emanates from the decomposition of uranium present throughout the soil at various levels (Health Canada 2020). Released from the ground beneath your property, radon sneaks in through cracks, fissures, and gaps between foundations and walls. 

Once indoors, radon gas can accumulate to concentrations that are hazardous to health. Above 200 Bq/m3, it is recommended that radon gas mitigation measures be taken as soon as possible  (Health Canada 2020).

Active Soil Depressurization (ASD) Technique

The ASD technique is the most common technique for mitigating radon in buildings. The process consists of drawing air from under the slab on grade of your property and extracting it outside the building through a system of sealed piping and powerful fans. In this way, all the gases present under the slab are extracted outside before they can penetrate the living space of the building’s occupants and threaten their health. 

A manometer allows to evaluate the pulling force of the ventilation system, and thus the efficiency of the system. 

This installation is possible inside a property with a slab on ground.

Membrane depressurization technique (DSM)

This type of system is suitable for properties with crawl spaces where the soil and rock are exposed. It is necessary to install a polyethylene membrane over the entire exposed surface and attach the piping under the film to the fan. This technique is more complex and costly than the DSD technique, but just as effective.

Reduce radon to a concentration of 50 Bq/m3

According to NCRP data, 93% of homes that installed mitigation systems decreased radon to an average radon level of 50 Bq/m3 following the installation of the radon mitigation systems (Radon Reduction Sweepstakes Report 2019). Even more encouraging, these same data show that 93% of homes with a radon mitigation system recorded average measurements of 50Bq/m3.

Radon Reduction Sweepstakes, Rapport du PNCR-C 2019


Installing a radon gas mitigation system is a high health return investment. Consult with a certified NCRP-C expert to determine which system is best for your property.