Radon Gas Mitigation

Radon is a colourless, odourless, and tasteless gas formed naturally from uranium breaking down in soil and rock. Normally, it disperses harmlessly in the outdoor air but when it enters buildings through cracks and gaps in floors and foundations, it can build up to higher, potentially harmful levels. 

In August 2019, KFL&A Public Health shared findings from radon tests in 615 homes in our city. These results showed that 15.7% of the tested homes had radon gas levels exceeding Canada's recommended guideline of 200 Bq/m3. The Health Canada recommends reducing radon gas concentrations above this level. 

How to test radon gas? 

Use long-term tests (at least 91 days) during the winter (October to April) when doors and windows are closed. Have a certified professional from the Canadian National Radon Proficiency Program (C-NRPP) conduct the test. 

Buy a testing device, place it in your basement or lowest occupied floor level the first winter you move in or later. After the test period, send them to the lab. Expect results in about six to eight weeks. 

Soil gas control 

When building new homes, builders need to follow requirements in the Ontario Building Code about controlling soil gas, which includes radon. You can choose to seal all penetrations, put in a rough in, or put in a full mitigation system. Depending on the choice, the building inspector will review and inspect, and the builder may have to test for radon gas. Health Canada suggests testing all buildings for radon.