Passive Radon Systems

Passive radon mitigation systems use simple pipes to depressurize the ground below a dwelling. They can reduce the amount of moisture and soil gases like radon that enter a home or building. Existing homes often need active fans retrofitted to reduce radon and soil moisture but new construction offers a perfect opportunity to increase effectiveness and avoid mechanical fans which increase energy use and chances of failure.

This picture from BuildingScience.com's Pressure in Buildings, is a good illustration on how the bottom of a home acts as a vaccum for the soil below. Soil moisture, radon and other soil gases put considerable force into getting into a home. The American Cancer Society considers radon the leading cause of lung cancer among non-smokers. 

Posted in Building Envelope