Radon in Thunder Bay: 12% of 108 homes in the 2012 sample
Thunder Bay district was 12.0% above 200 Bq/m³, higher than Toronto’s 2.7% in the same survey.
Oct 26, 2026
Radon testing guides
118 articles
Radon is a radioactive gas that forms in the soil as uranium breaks down. It seeps in through foundation cracks and gaps around pipes. Insulation and a tight house hold it indoors. Years of exposure cause lung cancer, and the gas is still little known. Use the search below for the words people look up: radioactive gas, uranium, foundation, airtight home, lung cancer, becquerels.
Radon in London, Ontario: 1.8% of 109 homes in the 2012 sample
Middlesex-London was 1.8% above 200 Bq/m³ on 109 homes, with none above 600. Windsor-Essex, same province, was 13.8%.
Oct 26, 2026
Radon rough-in by province: the national code, then a local decision
The National Building Code describes gravel and a capped pipe. Each province decides when that applies. The cap is not a test.
Oct 26, 2026
Basement window wells and radon: not a place to hang the detector
A leaking well can be a path from the soil. The test belongs in the room, away from the window.
Oct 26, 2026
Heated floors and radon: the water pipes are in the slab
In-floor heat does not remove radon. Anyone who drills the slab needs the tube layout.
Oct 26, 2026
Radon in an old house: age does not predict the number
A stone foundation can let gas in. A new tight house can hold it. Both get a test.
Oct 26, 2026
Radon after a basement flood: retest when the room is lived in again
Water can open the sump, crack the joint or change the soil under the slab. The old report describes a different house.
Oct 26, 2026
While you wait for radon mitigation
An open window for an hour does not make a winter average. Spending less time in the highest room does, until the fan is in.
Oct 26, 2026
How long radon mitigation takes
A straightforward house is often one day on site. The roof path and a second suction point take longer.
Oct 26, 2026
How to check a C-NRPP radon certification
Canada’s program certifies measurement and mitigation separately. A logo on a truck is not the registry.
Oct 26, 2026
Home inspector radon test: 48 hours is a screen
An inspection sees the house in a day. The 200 guideline is judged over at least three months.
Oct 26, 2026
Radon test before closing: the offer is not 91 days long
A 4-day test can fit a condition. It does not replace the heating-season average once you own the house.
Oct 26, 2026
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