When it comes to protecting your home from radon, not all solutions are created equal. Radon gas is a serious health threat—but the good news is that effective mitigation systems exist for nearly every home, no matter its size, style, or foundation type.
This article breaks down the most proven radon mitigation methods used by certified professionals across the U.S., with a focus on long-term reliability and performance.
1. Sub-Slab Depressurization (SSD)
The most common and effective radon mitigation system for homes with basements or slab foundations is called sub-slab depressurization. This system involves:
- Drilling a hole through the slab floor.
- Installing a PVC pipe that pulls radon from beneath the slab.
- Using a continuously running fan to vent the gas safely outside the home.
SSD systems typically reduce radon levels by up to 99% and require minimal maintenance aside from fan checks and occasional monitoring.
2. Crawlspace Ventilation Systems
If your home has a crawlspace, especially one with exposed dirt or gravel, a different method is needed. These systems involve either:
- Active soil depressurization: A sealed vapor barrier is placed over the soil, and radon is vented using a similar fan system.
- Passive ventilation: Increasing air exchange under the home to dilute and vent radon gas.
In most cases, an active system with a sealed membrane provides better long-term protection.
3. Sump Pump Depressurization
Homes with sump pits can often leverage them for radon mitigation by sealing the sump lid and connecting it to a venting pipe and fan system. This is especially common in wet or flood-prone basements.
When installed correctly, sump depressurization can be just as effective as sub-slab systems and may reduce radon and control basement humidity.
4. Air Exchange or HRV/ERV Systems
In homes with complex layouts or high existing radon levels, a Heat Recovery Ventilator (HRV) or Energy Recovery Ventilator (ERV) may be added to the mitigation strategy. These systems:
- Improve indoor air quality.
- Provide fresh air while reducing energy loss.
- Lower radon concentration by increasing controlled airflow.
HRVs are not a standalone solution but can significantly boost effectiveness when combined with depressurization systems.
5. Radon-Resistant New Construction Techniques
If you’re building a new home, you can install radon-resistant construction methods from the start:
- Gas-permeable layers under the slab.
- Plastic sheeting and sealing techniques.
- Vent piping and junctions pre-installed.
- Passive radon vent stack with option to activate later.
This preventive method is both cost-effective and future-proof, especially in high-radon zones like Utah, Colorado, and the Midwest.
Choosing the Right System for Your Home
No two homes are the same, which is why a professional radon mitigation contractor should evaluate your property and test your levels before choosing a system. They’ll take into account:
- Foundation type (basement, slab, crawlspace)
- Home size and airflow
- Local geology and soil makeup
- Existing sump systems or vapor barriers
A proper radon mitigation system should reduce your levels below 2.0 pCi/L consistently—not just temporarily.