Radon in a cottage two weeks in July is not a March occupancy
The guideline of 200 Bq/m³ speaks of an annual average in an occupied zone. A cottage used for two weeks in July and a cottage used through March are not the same question. Testing in January a building with no heat, windows locked, describes an empty space. Testing in July with the windows open describes the holiday, not ski week.
If you sleep there in winter, start the 91-day detector during a period when the cottage is heated and closed the way you live in it. If you are only there in summer, a test during those weeks describes the real exposure, which will often be lower. A four-day test can settle an offer. It does not become an annual average.
The closed-house guide: conditions. A short rental: short-term rentals and radon.
Reference points: Health Canada, what you need to know about radon and the 200 Bq/m³ guideline. The two-year timeline between 200 and 600, and one year above 600, comes from Health Canada’s guide for radon measurements in homes.
The 4-day test gives a first reading. The 91-day test covers the three-month minimum Health Canada asks for. Both are $59 before tax: shipping, return and the laboratory are included, taxes extra. The PDF report is sent within 2 business days after the laboratory receives the detector.
Above 200 Bq/m³, mitigation is confirmed with a quote. Gaz Radon is C-NRPP certified for measurement and mitigation.
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