Radon after renovations the old report describes the old house
A report describes the house as it was during the test. Opening the slab, adding a bedroom, sealing, changing the furnace or replacing the radon fan changes that house. Health Canada asks for a new measurement of at least three months after an important change, in the heating season.
A test done during the work, with doors open and fresh concrete, is not a certificate. Wait until the room is occupied the way it will be. How often. Energy renovations.
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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