Which floor of an apartment: concentration drops as you go up
A unit above the second floor, with no slab contact, is rarely the priority. A ground floor, a garden apartment and a half-basement are. ...
Oct 25, 2026
Scientific Articles
108 articles
Radon upstairs: the gas enters at the bottom and dilutes
A second-floor bedroom can sit under 200 while the basement is at 800. If nobody uses the basement, the main floor is the room that count...
Oct 25, 2026
Sumps and radon: an open cover is a path, not a test location
The pit reaches the gravel under the slab. A sealed cover closes that opening. It does not treat the rest of the slab. Do not place the d...
Oct 25, 2026
Sealing cracks is not enough: the gas finds the next opening
Caulk closes one hole. Soil pressure pushes radon toward the next. A painted slab is not a measurement. Lasting suction under the slab is...
Oct 25, 2026
Heat pumps and radon: they move heat, not soil gas
A heat pump does not create suction under the slab and does not exhaust above the roof. Leave it on its usual setting during a test. The ...
Oct 25, 2026
Energy renovations and radon: a tighter house keeps more of the gas
New windows and a sealed basement reduce the ways radon leaves. The soil did not change. The house holds the gas. Retest for at least thr...
Oct 25, 2026
Short-term rentals and radon: one weekend is not the building’s use
A guest will not start a 91-day test for two nights. The unit may be occupied every winter weekend by someone. The owner tests the lowest...
Oct 25, 2026
Radon in a cottage: two weeks in July is not a March occupancy
A closed, unheated cottage in January describes an empty building. If you sleep there in winter, run the 91-day test while it is heated a...
Oct 25, 2026
Testing for radon in summer: open windows make a low that will not last
Health Canada warns that a hot-weather test in a house without air conditioning is often misleading. The useful window for a year-round h...
Oct 25, 2026
Where not to place a radon detector
Not the bathroom, kitchen, laundry, closet, crawl space, sump or a foundation corner. Height is 0.8 to 2 m, about 40 cm from an interior ...
Oct 25, 2026
Closed-house conditions: the test should match how you live
At least three months, ideally October to April, windows shut for long stretches. Leave the heat pump or air exchanger on its usual setti...
Oct 25, 2026
WHO at 100, Canada at 200: three policies, one laboratory number
The Canadian guideline, adopted in 2007, is 200 Bq/m³. The WHO reference level is 100. The US EPA uses about 148. A result of 160 is unde...
Oct 25, 2026
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