Active Soil Depressurization

Radon, for all that it is deadly to you and those who you reside within your home –Radon levels can be dramatically decreased with a proper mitigation system in less than a day. It is possible to drop 4000 Bq/m3 to under 37 using Active Soil Depressurization, one of the most effective ways of mitigating Radon.

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 The way it works is that a Radon fan and PVC piping are used to draw air out from under the concrete slab or plastic Crawl Space membrane,  causing a withdraw of air that makes the sub-slab or sub-membrane area have lower pressure than the air in the house. This negative pressure prevents the soil gas from entering the home. This system is referred to as a Sub- Slab Depressurization (SSD) system or a Sub-Membrane Depressurization (SMD) system. If a Sump Pit is present in the home, utilizing the drain tile system as a suction source may be an option. This is called Sump Pit Depressurization (SPD). In a Sub-Slab Depressurization system, each suction location is created by coring a 5” hole through the slab and then removing the gravel and soil underneath the slab to create a suction pit. PVC radon piping is then inserted into the Slab and sealed so that it is water and airtight.

National Radon Defence Trained radon technicians make sure to seal all potential radon entry points in the concrete slabs and crawl spaces so the majority of radon gas is pulled through the system and safely vented outside the structure.

For more information on Radon Mitigation and Active Soil Depressurization call the Foundation Guys to see if these options are right for you.


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The Foundation Guys Inc.
1294 Algoma Rd
Gloucester, ON K1B 3W8
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