Upgrade Passive System to Active
Passive Radon Mitigation System
A passive radon mitigation system is typically installed when a home is being built. A passive system only contains two elements:
a vent pipe that extends from the sub-slab up to the eave line of the roof
a physical barrier between the soil and house foundation
A passive system relies on natural pressure differentials and air currents to eliminate radon from the home.
Often when a home is being built, the building company will install a passive system without ever testing the home for radon.
This can be a problem because passive radon systems do not bring extremely high levels of radon below the EPA recommended 4.0.
Many home buyers do not realize this when purchasing a home with a passive system.
A passive radon system works well for homes with lower radon levels; it keeps the radon concentration levels from spiking throughout a given day. However, if the home has elevated levels of radon gas, a passive system is not the best option to reduce the levels.