High Results? Don’t Panic: A Guide to Modern Radon Mitigation Systems
Introduction
Receiving a radon test report with results above the EPA’s action level of 4.0 pCi/L can be startling. Many homeowners’ first instinct is to worry about the health of their family or the resale value of their property. However, at HomeKey Inspections, we always tell our clients: don’t panic. A high radon reading is a solvable problem. Modern radon mitigation systems are highly effective, relatively affordable, and can often reduce radon levels by up to 99%.
How Mitigation Works: The Active Sub-Slab Depressurization System
The most common and effective way to fix a radon problem is through a system called “Active Sub-Slab Depressurization.” This doesn’t involve filtering the air inside your home; instead, it prevents the gas from ever entering in the first place. A contractor drills a small hole in your basement floor or slab, creating a “suction pit.” A PVC pipe is then installed into that hole and connected to a specialized fan. This fan creates a constant vacuum beneath your home, pulling the radon gas out from under the foundation and venting it safely into the air above your roofline. Some contractors also use a sump pump crock, if available, to pull the radon gasses from.
Passive vs. Active Systems
Many newer homes are built with “Passive” radon systems, which consist of a vent pipe running from the soil to the roof without a fan. These rely on natural buoyancy to move the gas. However, if your test results from HomeKey Inspections show elevated levels, it means the passive system isn’t enough. The good news is that a passive system is very easy to “activate” simply by having a professional install a fan in the existing pipe, usually in the attic or on the exterior of the house.
Addressing Crawlspaces with Encapsulation
If your home is built over a crawlspace, the mitigation process is slightly different but equally effective. Technicians will perform “Sub-Membrane Depressurization.” They cover the entire crawlspace floor with a heavy, reinforced plastic liner (encapsulation) and seal it tightly to the walls. A suction pipe is then placed beneath that plastic sheet. This not only vents the radon gas outside but has the added benefit of significantly reducing moisture and musty odors in your home.
Impact on Home Value and Aesthetics
A common concern for sellers is that a mitigation system will look like an eyesore or scare off buyers. In reality, the opposite is true. In many markets, a radon mitigation system is seen as a positive home improvement, much like a new HVAC unit. It proves the air quality has been addressed professionally. Modern systems are designed to be unobtrusive, with pipes often routed through closets or painted to match the exterior of the home, and the fans themselves are incredibly quiet, often no louder than a low hum.
The Importance of a Post-Mitigation Test
Once a mitigation system is installed, the work isn’t finished until the results are verified. You should never assume the system is working perfectly just because it’s running. At HomeKey Inspections, we provide independent, third-party post-mitigation testing. A post-mitigation test should take place within 24 hours but no more than 30 days from the time the radon mitigation system was installed. We verify that the system has successfully pulled the radon levels below the action level, providing you with the documentation you need for your own peace of mind or to provide to a future buyer during a sale.
Conclusion
A high radon reading is simply an opportunity to make your home a healthier place to live. With modern mitigation technology, you can effectively “turn off” the source of the gas and breathe easy knowing your family is protected. If your recent test with HomeKey Inspections showed elevated levels, the next step is a simple one: contact a certified mitigation professional and take control of your home’s air quality. To test your home for elevated levels of radon, CLICK HERE to schedule your professional Radon Testing.
Frequently Asked Questions
How does an active sub-slab depressurization system actually remove radon?
Instead of trying to filter the air already inside your home, this system prevents radon from entering in the first place. A contractor creates a “suction pit” under your foundation and uses a specialized fan to create a vacuum. This vacuum pulls the gas from the soil and vents it through a PVC pipe to the air above your roofline, where it safely dissipates.
My new home has a “passive” radon system; is that enough to keep me safe?
A passive system relies on natural air buoyancy to move gas through a pipe without a fan. While helpful, it often isn’t enough to lower high radon levels. If a HomeKey inspection shows elevated levels in a home with a passive system, a professional can easily “activate” it by installing a radon fan in the existing pipe.
How is radon mitigated in a home with a crawlspace instead of a basement?
For crawlspaces, professionals use “sub-membrane depressurization.” They encapsulate the crawlspace floor with a heavy, reinforced plastic liner and seal it to the walls. A suction pipe is then placed beneath this liner to vent the gas outside. This has the added benefit of reducing moisture and musty odors throughout the home.
Will a radon mitigation system decrease my home’s resale value?
Actually, the opposite is often true. Much like a new HVAC unit, a mitigation system is seen as a proactive health improvement. It provides proof to potential buyers that the air quality has been professionally addressed. Modern systems are quiet and can be painted or routed to be very unobtrusive.
Why do I need another test after the mitigation system is installed?
You should never assume a system is working perfectly just because the fan is running. HomeKey Inspections provides independent, third-party post-mitigation testing to verify that the system has successfully dropped radon levels below the 4.0 pCi/L action level. This documentation is vital for your peace of mind and for future real estate disclosures.
