Types of Radon Mitigation Systems

Will County Radon Mitigation uses standardized techniques to stop radon entry and reduce indoor radon concentrations. The Illinois Emergency Management Agency recommends hiring a licensed mitigation professional to reduce your indoor radon concentrations.

The most effective measures for reducing radon, without costly renovations, are ones that limit soil gas entry into the building. When these systems are deployed, radon is pulled from the soil and rock below the floor slab then exhausted above the home. The active sub-slab depressurization (SSD) system is a common example of this type of mitigation. This method uses a radon mitigation exhaust system to reduce the pressure below the floor slab so that the air between the building substructure and the soil flows out of rather than into the building. Sub-slab depressurization systems are customized for each property to address specific mitigation requirements.

 

 

 

A U-tube manometer is mounted to the sub-slab depressurization system vent pipe. The manometer is used to monitor the operation of the system fan. When the liquid levels in the legs of the manometer are uneven, a pressure differential exists, indicating correct operation of the fan and system. Conversely, if the manometer liquid levels are even, the fan or system is not operating properly and needs repair.

Sump Pumps

Covers are installed with observation ports for performance monitoring. This process keeps radon gas from seeping out and also keeps conditioned air from being drawn into the sump.

 

Sub-membrane depressurization (SMD) may be required for crawl spaces that have exposed gravel or dirt and are not concrete covered. With the SMD method, a plastic sheet (polyethylene or similar) is permanently installed over exposed rock and soil. A fan is then installed to create suction under the plastic sheeting, drawing the radon out from the soil into a PVC pipe, then safely exhausted away from the home, minimizing radon from entering ambient indoor air, similar to the SSD method.

Both sub-slab and sub-membrane depressurization systems must run continuously to be effective. These systems use little electricity, are relatively quiet, and require very little maintenance. It is recommended that a professional inspect the system periodically to ensure proper performance.

Exhaust fans and piping are typically mounted on the exterior "equipment" side, of the building, towards the back, in the most inconspicuous space. Optional fan housing units are available for aesthetic purposes. Exhaust piping is standard 3-inch PVC. Both the pipe and the fan housing may be painted to match the exterior or the home siding or trim.