Case study — Montreal (1952)
Radon mitigation — Montreal, 1952 home
Homeowner in Montreal (Grand Montréal): radon measured with an ionization chamber and electret detector before installing the mitigation system.
The building
Basement: finished
multi-section slab
Suction: 3 suction points
Investment: 3 499,99 $ + tax (standard)
Solution installed
Active sub-slab depressurization (SSD) by a C-NRPP certified crew. 3 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: 48 Bq/m³, well below Health Canada's 200 Bq/m³ action level (ideal target < 100 Bq/m³).

