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How Does Radon Mitigation Work?
Most systems use soil suction: a vent pipe and fan pull radon from beneath the house and vent it outside, above the roof line. EPA says this rarely needs major changes to the home, and sealing foundation cracks makes it more effective. Crawl-space homes can get similar systems. The right design depends on your house.
State programs call this active soil depressurization. Massachusetts DPH notes most systems create suction under the slab and discharge the gas above the roof line. Systems usually include a monitor (often a pressure gauge) to show the fan is working. Maine CDC warns that sealing and caulking on their own are not an effective long-term fix.
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FAQ
Is sealing cracks enough?
Not on its own. EPA says sealing makes a soil suction system more effective, and Maine CDC says sealing alone isn’t an effective long-term method.
Who should install it?
A licensed or certified mitigation professional. PA, MN and IL all license or certify radon mitigators.