Radon testing guides

118 articles

Le radon est un gaz radioactif qui se forme dans le sol quand l’uranium se dégrade. Il entre par les fissures de la fondation et les joints des tuyaux. L’isolation et une maison étanche le retiennent à l’intérieur. Des années d’exposition causent le cancer du poumon, et ce gaz reste méconnu. Utilisez la recherche pour les mots que les gens cherchent : gaz radioactif, uranium, fondation, maison étanche, cancer du poumon, becquerels.

How often to retest for radon

A report describes the house as it was during the test. New windows, a new slab opening, or a new fan all call for a new test.

25 oct. 2026

New homes in Canada: a radon rough-in is not a test

Builders leave a rough-in so mitigation is simpler later. The number still comes from a test in the rooms you use.

25 oct. 2026

Radon when you buy or sell a house in Canada

Measure before the listing when you have three months. A high result is fixable. An unknown result is what stalls a sale.

25 oct. 2026

What changes the price of radon mitigation in Canada

The same fan does not cost the same in every house. The report and the foundation decide the quote.

25 oct. 2026

How radon mitigation works in a house

The fan runs all the time. The pipe leaves above the roof. You confirm the result with a new long-term test.

25 oct. 2026

Radon above 200 Bq/m³: what to do next

Do not panic. A result over 200 Bq/m³ is a fixable building problem, not an emergency evacuation.

25 oct. 2026

4-day or 91-day radon test: which one decides

Use 4 days when time is short. Use 91 days to decide whether the house needs a mitigation system.

25 oct. 2026

When to test for radon in Canada

Start a 91-day test while the house is closed and heated. Use 4 days sooner only when the deadline is short.

25 oct. 2026

Where to place a radon test in the house

The result describes the room the detector sat in. Use the lowest lived-in room, at breathing height, out of drafts.

25 oct. 2026