Different Radon Mitigation Strategies: Sub-Slab Depressurization, Sub-Membrane Systems, and Energy Recovery Ventilators (ERV)

Radon is a colorless, odorless, radioactive gas that can seep into homes through cracks in the foundation. Prolonged exposure to radon can increase the risk of lung cancer, making mitigation a crucial step for homes in areas with high radon levels. There are several mitigation strategies available, each suited to different types of homes and foundations. In this blog, we will explore three of the most effective radon mitigation systems: Sub-Slab Depressurization (SSD), Sub-Membrane Depressurization (SMD), and Energy Recovery Ventilators (ERV).

Understanding Radon Mitigation

Radon mitigation systems work by reducing the amount of radon entering a home, thereby lowering the concentration of radon in indoor air. Depending on your home's foundation and structure, certain methods are more appropriate than others. It's vital to conduct a professional radon test before selecting a mitigation system to determine the radon level and identify the best solution for your home.

Sub-Slab Depressurization (SSD)

What is Sub-Slab Depressurization?

Sub-Slab Depressurization (SSD) is the most common and effective radon mitigation technique for homes with basements or slab-on-grade foundations. It works by using a suction pipe installed under the concrete floor to draw radon gas from beneath the slab and vent it outside before it can enter the home.

How Does It Work?

A professional installer drills a hole in the slab, inserts a PVC pipe, and connects it to a fan system. The fan creates negative pressure, drawing radon from the soil beneath the home and expelling it through the pipe to a safe location outside.

When Is It Used?

SSD is ideal for homes with basements or homes built directly on a slab. It is especially effective in regions with higher radon levels because it can consistently reduce radon to safer levels.

Benefits:

Effective for a wide variety of homes
Proven to reduce radon levels significantly
Can be installed in most homes with minor modifications

 

Sub-Membrane Depressurization (SMD)

What is Sub-Membrane Depressurization?

Sub-Membrane Depressurization (SMD) is a radon mitigation method used for homes with crawlspaces instead of basements. It involves covering the exposed dirt floor of the crawlspace with a durable plastic membrane, sealing it at the edges, and using a fan to draw radon gas out from beneath the membrane.

How Does It Work?

The installer places a heavy-duty plastic sheet over the crawlspace floor, then seals it along the edges. A vent pipe is connected underneath the membrane and linked to a fan, which pulls radon gas out and vents it safely outside.

When Is It Used?

SMD is used in homes with exposed soil in the crawlspace, particularly in homes without a basement. It's effective for mitigating radon gas from the soil in crawlspace areas where sub-slab depressurization isn’t possible.

Benefits:

Prevents radon from entering through crawlspaces
Effective for homes with unfinished or unsealed crawlspaces
Helps reduce moisture levels in the crawlspace, improving overall air quality

Energy Recovery Ventilator (ERV)

What is an Energy Recovery Ventilator?

An Energy Recovery Ventilator (ERV) is a device that exchanges indoor air with fresh outdoor air, improving ventilation and helping to reduce radon levels by diluting indoor air.

How Does It Work?

An ERV continuously brings in fresh outdoor air while exhausting stale indoor air. This process improves air circulation and reduces radon levels by creating better air exchange. It also helps in controlling humidity levels in the home.

When Is It Used?

ERVs are typically used in homes where other mitigation techniques may not be sufficient or easy to install. It can also be used as a complementary system to SSD or SMD for better air quality and more efficient radon reduction.

Benefits:

Enhances indoor air quality by increasing ventilation
Helps reduce radon levels through dilution
Improves humidity control, making it a dual-purpose system

Choosing the Right Mitigation Strategy

Choosing the right radon mitigation strategy depends on several factors, including your home's foundation type, radon levels, and budget. Homes with basements generally benefit from Sub-Slab Depressurization, while those with crawlspaces are better suited for Sub-Membrane Depressurization. Energy Recovery Ventilators can be used in conjunction with other systems or as a standalone solution in specific cases.

Before deciding on a system, it's essential to conduct a professional radon test to assess the levels in your home and consult with a radon mitigation expert to determine the most effective strategy.

Conclusion

Radon poses a serious health risk, but effective mitigation strategies can significantly reduce its presence in your home. Whether you choose Sub-Slab Depressurization, Sub-Membrane Depressurization, or an Energy Recovery Ventilator, the key is taking action to lower radon levels and protect your family.

 

For professional radon testing and expert advice on choosing the right mitigation strategy, contact us today.