Sub-Slab Radon Mitigation System Installation

Radon Mitigation Mitigation begins with a free home consultation by a C-NRPP certified scientist. We follow Health Canada guidelines and our mitigation system design is engineered to maximize efficiency and minimize cost.  Radon entry points are located and sealed with expandable foam or polyurethane caulking.

Best location for system is determined after discussion with homeowner. A 5″ hole (suction point) is cored in basement slab for diagnostic testing to calculate optimum fan size.

A flow meter station

Flow Meter Station

Fan Size Optimization analysis begins with field extension testing to determine fan size required to ensure maximum efficiency and minimize power consumption. A flow meter station (PVC pipe with diaphragm), attached to shop vac and a pressure sensing micromanometer, is inserted into 3/8″ test holes. Pressure differential between suction point and test holes is recorded. Test holes are used to determine air flow below grade. The air flow is affected by sub-strata (soil below slab) and any obstructions (footings etc). The analysis takes into account the additional resistance incurred due to length of PVC piping, number of elbows used, as well as stack effect (pressure difference between interior and exterior of home). All pressure test data is documented as per Health Canada protocols and discussed with client prior to system installation.

field extension test

Two 5 gallon buckets of gravel are then dug out of cored hole to create a sump pit.

A hole is drilled through the exterior wall for radon fan exhaust pipe.

PVC piping with radon fan is installed and properly labelled with U-tube manometer indicating system is operational.

PVC piping with radon fan is installed and properly labelled with U-tube manometer indicating system is operational.

Sub-Slab Depressurization System

Heat recovery ventilation systems are cleaned and balanced by certified residential mechanical ventilation technicians to insure home is receiving optimum fresh air supply.

A short-term 84 hour radon test is started after the system is operational to confirm radon level has been successfully reduced below Health Canada’s 200 Bq/m3 Action Level. Our goal is to reduce level below 100 Bq/m3. A post-mitigation plot and assessment report are provided to discuss installation details and radon test results.

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