Radon Mitigation

Radon levels in a home that exceed 4.0 pCi/L should be acted on according to the EPA. If you have a test done that offers readings between 4.0 and 8.0 pCi/L you should first have another test done to confirm the levels. If a second test from a different source offers reading above the EPAs “action level” of 4.0 pCi/L you should take measure to eliminate the radon from the home. Radon mitigation can be costly but may be necessary for the health and safety of your family.

There are passive and active methods for reducing radon levels as discussed below:

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Active Systems

Installing a sub-slab radon mitigation system is the most effective way to actively reduce radon levels in the home. This is also the most costly option with a price tag ranging from $800 to $4500 or more. Sometimes referred to as sub-slab depressurization, this system of radon mitigation reduces the upward pressure from radon gas coming into the basement. Many new constructions in high radon areas have sub-slab mitigation installed during the building process. This is the preferred and most cost effective situation.

Whether an existing home or a home in-process the outcome is the same. PVC piping is placed in several areas of the basement floor and connected using flexible couplings. A fan is placed at one end which forces are through the pipes to the other end usually placed at the roof.

Passive Systems

Some of the more passive measures that can be taken to temporarily reduce radon levels in a home include opening windows and doors to allow the radon gases to be vented outdoors. You can also seal the crack and openings in the basement floor to help prevent radon from getting in. These are only temporary solutions to a permanent problem. If radon levels in excess of 4.0 pCi/L are present in your home you need to pursue a more aggressive radon mitigation solution.

Passive Crawl Space Systems

Crawl spaces are also likely sources of entrance for radon as most have either a poured concrete floor or even an exposed soil floor. One way to prevent radon gases from elevating from the crawl space are is to cover the floor with plastic sheeting. If installed properly and sealed at every point to the wall this passive method can be effective. The plastic sheeting can also help prevent mold problems due to moisture.

Passive radon mitigation can also be accomplished in a crawl space by opening or installing vents on either side of the space. This will cause the radon to be expelled to the outdoors but usually at ground level. Additional measures should also be taken to direct the radon upward to avoid human contact.

Active Crawl Space Systems

A more active approach to prevent radon from entering a home through the crawl space is to install fans to force the radon outside. The most effective way is to combine the plastic sheeting method with a fan system below it. This effectively captures the radon once it enters the crawl space and expels it outdoors immediately.

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