Radon mitigation — Longueuil, 1968 home

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

The building

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: 29 Bq/m³, well below Health Canada's 200 Bq/m³ action level (ideal target < 100 Bq/m³).

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