How Radon Mitigation Systems Work – A Homeowner’s Guide

Understanding Radon Mitigation

Radon mitigation is the process of reducing radon concentrations inside a home to safe levels. Because radon is a gas, mitigation strategies focus on preventing its entry or safely venting it outside.

Types of Radon Mitigation Systems

The best mitigation method depends on your home’s foundation and construction type. Here are the most common systems used:

1. Sub-Slab Depressurization (SSD): This is the most effective and widely used method. A vent pipe is installed beneath the home’s foundation, and a fan continuously draws radon from below and vents it outside.

2. Drain-Tile Suction: If a home has drain tiles, radon can be collected from these pipes and vented outside.

3. Crawl Space Ventilation: Homes with crawl spaces may require sealing the floor with a vapor barrier combined with an active ventilation system.

4. Passive Radon Systems: Some newer homes are built with radon-resistant features, including passive vent pipes that allow radon to escape naturally. If levels are still high, a fan can be added to make the system active.

How Effective Are Radon Mitigation Systems?

A properly installed radon mitigation system can reduce radon levels by up to 99%. The EPA recommends keeping radon levels below 4.0 pCi/L, but a well-designed system can often lower levels below 2.0 pCi/L.

Ongoing Maintenance and Testing

Once a mitigation system is installed, it requires minimal maintenance. However, homeowners should test their radon levels every two years to ensure the system remains effective.