Selling a house with high radon
A written test and a system already installed are what a buyer can read. “We air it out” is not a number.
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.
Frozen radon exhaust: when frost closes the outlet
In a hard freeze, frost can choke the pipe above the roof. The manometer falls. Clear it. Do not turn the fan off.
Oct 26, 2026
Radon fan noise: a hum, not a dryer
A fan on flexible hangers is quiet. A rattle is usually the pipe, the mount, or a bearing.
Oct 26, 2026
One radon fan for two units: only if the slab is shared
A duplex or a semi needs a test in each home. One fan is a conclusion, not a guess from the floor plan.
Oct 26, 2026
Radon in a semi-detached house: the party wall does not share the result
Two units under one roof can differ because of the sump, the slab and how long the windows stay shut.
Oct 26, 2026
Radon in a basement bedroom: that room comes first
A bedroom below grade is used all night, closest to the slab. It is the first place to test.
Oct 26, 2026
Radon in a split-level: which floor is the lowest lived-in level
The lowest floor where someone sleeps or stays more than four hours is the test floor.
Oct 26, 2026
Radon in a slab-on-grade house: no basement, still a test
Without a basement, the test goes in the main-floor room someone uses more than four hours a day.
Oct 26, 2026
Radon questions in Canada, one answer each
The index of the practical guides. Each link answers a single question.
Oct 25, 2026
Radon half-life: 3.8 days, and why the basement does not “air itself out”
The decay products, not the gas alone, are what reach the lung.
Oct 25, 2026
Radon in the garage: that is not where you test the house
An attached garage can be a path. It is not the detector location.
Oct 25, 2026
Home insurance and radon: usually not a sudden claim
Read the policy. Do not assume an all-risk form covers soil gas.
Oct 25, 2026
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