How Long Does It Take for Radon Mitigation to Work?

Radon is one of the hazardous radioactive gas that can build up in homes and raise the risk of lung cancer is radon. You may be asking how long a radon mitigation system takes to start working if you’ve already installed one.

The good news is that most systems reduce radon levels in 24 to 72 hours, so radon mitigation starts to work right away. However, a number of variables influence how fast and efficiently the system lowers radon.

How Does a Radon Mitigation System Work?

Active soil depressurization (ASD), the most popular radon mitigation technique, draws radon gas from beneath the house and releases it outside using a fan and vent pipe. Other techniques consist of:

• Passive systems: Installed in newer homes but work slower.

• Sealing cracks: Helps but is not enough on its own.

• Ventilation adjustments: Can improve air circulation but isn’t always reliable.

Radon Mitigation Timeline

0-24 Hours: Immediate Action

• As soon as the system is turned on, radon is extracted.

• Within a few hours, a noticeable decrease is seen.

24-72 Hours: Major Decline

• During this time, the majority of residences experience a 50% or more decrease.

• Radon levels should drop below the EPA’s action standard of 4.0 pCi/L if the system is implemented properly.

Up to 1 Week: Stabilization

• In certain instances, airflow and pressure stabilization cause radon levels to continue varying.

• After seven days, retesting guarantees the system’s efficacy.

Factors That Affect How Fast It Works

• Initial Radon Levels: Higher concentrations take longer to reduce.

• Foundation Type: Slabs and basements see quicker results; crawl spaces may take longer.

• Weather Conditions: Rain, snow, and humidity can temporarily affect radon levels.

• System Quality: A properly installed system will work faster and more efficiently.

How to Ensure Radon Mitigation Is Working

• Test After 24-72 Hours: Use a short-term radon test kit.

• Long-Term Monitoring: Conduct a follow-up test after 30-90 days.

• Inspect the System: Check that the fan is running and all seals are intact.

• Hire a Professional: If radon levels remain high, additional adjustments may be needed.

Final Thoughts

Radon mitigation is usually effective within a few days and begins functioning immediately. Always retest your home following installation and perform routine system maintenance to provide long-term safety.

Key Takeaway: Your house can be radon-free in as little as 24 hours with the correct mitigation system, providing you with peace of mind and a healthier living space.

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