Mitigation

The process in which radon entry is controlled is referred to as mitigation. Radon can effectively be managed and reduced in homes have elevated methods. These methods differ according to the building type.

Active Soil Depressurization (ASD) is the most common mitigation type and is proven to be very effective on slab and basement homes. A recent study by the University of Auburn and the EPA verify that these systems are also extremely effective at reducing basement moisture levels.

Active Soil Depressurization is a simple process. In the lowest level of the home, a hole is cored in the concrete slab (typically in a corner or near the foundation wall) and soil and/or stone is removed through the cored hole. Piping and a small fan are installed to reroute the radon to the exterior of the house. The piping and fan are usually routed and installed in the garage (if no living area above) or on the exterior of the house. Most systems can be installed from $1400 - $1900. Some houses do require multiple cores and / or fans to adequately reduce the Radon level which does involve a greater cost.

Sub-membrane Depressurization is used in crawlspaces to control soil gasses (Radon & moisture). A vapor barrier is added or improved above the ground in the crawlspace. Piping and a small fan are used to reroute the radon laden gas from underneath this vapor barrier to an outside vent on the top of your house. This type of system has recently been proven effective in reducing and controlling moisture levels in crawlspaces that can contribute to indoor air quality and mold problems. The cost of these systems is dependant of individual conditions of the space.

Radon Resistant New Construction

Radon Resistant New Construction (RRNC) is used as a passive system to reduce Radon and moisture levels in a structure. Due to the fact that this is done during the construction process, the price is considerably less and the piping (and fan if added later) will not be seen on the exterior of the house.

Benefits of RRNC

· Radon Resistant construction techniques help reduce the amount of Radon and other soil gasses from entering the home. The occupants will benefit from lower radon and lower humidity levels in their new home.

· Easy to upgrade when there is a need to increase the radon reduction.

· If high radon levels are found, the techniques allow for easy and inexpensive installation of a fan for increased radon reduction in the home. Every new home should be tested for radon by the homeowner after occupancy.

· It is more cost-effective to include radon-resistant techniques while building a home, rather than installing a radon reduction system in an existing home. They may improve the home's energy-efficiency

· Radon-resistant construction techniques are consistent with state-of-the-art energy-efficient construction. When using these techniques, follow the Model Energy Code and the 2006 IRC Appendix F.