Methods differ according to building type. Active Soil Depressurization (ASD) is the most common form of mitigation and is most effective on slab and basement homes.
SSD system works by applying more pressure to the soil under a home than the home does. We perform diagnostic testing using sensitive scientific instruments to determine how well potential depressurizaiton points will work. By measuring the pressure field extension under the slab, we can identify where depressurization points are needed.
SMD is used in crawlspaces to control soil gasses (radon and moisture). A vapor barrier is added in the crawlspace that is sealed to the perimeter walls. Piping and a small fan are used to reroute the radon laden gas from underneath the barrier to an outside vent on the top of the structure. This type of system has recently been proven effective in reducing and controlling moisture levels in crawlspaces that can contribute to poor indoor air quality and mold problems.
BWD is used to control soil gasses from entering a basement through cement block walls. Small holes are drilled into the block wall to allow the vent connection. All visible and accessible openings or penetrations in the block wall are sealed to prevent air loss from the basement area. 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 or attic (if no living area above) or on the exterior of the house. If the block wall foundation does not have a cap block or the top cells of the block are open, they must be sealed prior to installation of the system.
The easiest way to ensure there are low radon levels in a building is to install a system at the time of construction. When systems are designed and installed to produce the desired conditions below the slab, low radon levels are achieved. Active Soil Depressurization systems installed at the time of construction have also been found to have significant moisture reduction benefits.
If you have an existing service and testing contract with Radon Reduction & Testing and have not been able to reach them, they are no longer in business. We will gladly honor their warranty and service your mitigation system. Call today to get a free inspection of your system and review of your service plan.