What if a radon test indicates a high radon level?
If the radon test shows a high level of radon in the home (4.0 pCi/L or higher), radon mitigation (aka radon remediation) can be successful in lowering the home’s radon level in most circumstances. The most common method of remediation is a sub-slab depressurization system. To put it simple, one (or more) hole is drilled in the basement slab, a small amount of dirt (approx. 5~10 gallons) is excavated under the slab, PVC piping is installed through the basement slab with a radon fan, and this system vents to the exterior away from doors and windows and above the roof line. Penetrations and cracks in the basement slab and foundation walls should also be sealed, most often with a silicone sealant and backer rod. Radon fans can only be placed in an attic or exterior of the home and should not be installed in the home’s living space or in a garage. The EPA has specific requirements about how and where radon systems can be installed. The cost of a professionally installed radon mitigation sy
