Are Radon Mitigation Systems Effective?

A common question from homeowners is, “are radon mitigation systems effective?”  Fortunately, the answer is, Yes, radon mitigation systems work effectively to lower radon levels to safe levels.  That being said, they require proper installation, occasional maintenance, and re-testing to ensure continued effectiveness. The most common method is sub-slab depressurization, which uses a fan to pull radon gas from the soil beneath a home and vent it to the outside, before it can enter the house. 

How they work

• Sub-slab depressurization: Using this method, a fan is installed to create lower pressure in the area beneath the foundation. As air flows from higher pressure to lower pressure, this draws radon gas from the soil and exhausts it outside through a pipe system, re-routing it and preventing it from seeping into the home. 

• Active vs. passive systems: The most common and effective systems are "active," meaning they have a fan to ensure continuous air flow. Alternatively, ”passive" systems are built into the home's structure but have no fan to move air. Of course, these systems can be activated later by adding a fan if high radon levels are later found. 

• Other methods: Depending on the design of the home, alternative systems can include room pressurizers or other techniques to reduce radon levels in living spaces. 

Ensuring effectiveness

• Routine re-testing: It is recommended that you have your home re-tested for radon every two years at a minimum to confirm that the system is working correctly.  Be aware that radon levels can fluctuate over time. 

• Maintenance: All systems need occasional maintenance.  However, fans can last five years or more before needing repair or replacement. 

• Warning device: When systems are properly installed, it should include a warning device, such as a U-tube manometer, which shows if the system is functioning. Like with any system, you should check this device regularly. 

Other considerations

• Initial testing: There is no way of knowing if you have high radon levels without actually testing.  The radioactive gas is undetectable by smell, taste, or any human senses. 

• Cost: Costs vary depending on the home's design and needs, but the average cost for a professional system can range from about $1,200 to over $2,500 -- or even more.

• Routine operating costs: Ongoing costs include electricity to run the fan and likely minor impacts on heating and cooling operation, which can be minimized with proper system sealing. 

We are happy to answer any question about radon mitigation effectiveness or any other radon questions at Anchorage Radon Testing and Mitigation.