Case study — Montreal (1965)

C-NRPP certified case study

Radon mitigation — Montreal, 1965 home

Homeowner in Montreal (Grand Montréal): radon measured with an ionization chamber and electret detector before installing the mitigation system.

Before745 Bq/m³
After35 Bq/m³
Reduction95%

The building

Year built: 1965
Basement: finished
multi-section slab
Suction: 2 suction points
Installation: 4 h
Investment: 3 199,99 $ + tax (standard)

Solution installed

Active sub-slab depressurization (SSD) by a C-NRPP certified crew. 2 suction points under the slab, connected to a sealed exhaust pipe; a fan creates negative pressure that intercepts radon before it enters the home.

Result

Confirmation test 48 hours after startup: 35 Bq/m³, well below Health Canada's 200 Bq/m³ action level (ideal target < 100 Bq/m³).

Maison — Montréal

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