What is Radon Resistant New Construction (RRNC)
In June of 2009 the RRNC code went into effect in Minnesota. This code requires all new homes built after that date must have a passive radon mitigation system built into the house. The passive system does not require a fan to move the radon and air but the natural stack effect of a home. The system basically consist of the following components: a collection pipe, course aggregate underneath a layer of 6 mil 0r 3 mil. cross laminated poly sheeting, a finished substraight, a vertical PVC pipe connected to the collection pipe and routed through the house to vent the gas above the roof, sealing all openings in the basement floor and an electrical junction box in the attic near the vent pipe.
You still may have high levels of radon. These systems are only marginally effective at removing radon from your home so the level in your home may still be elevated. Since it is only a passive system, meaning it doesn't have a fan, it doesn't always lower the radon level to an acceptable level.
You still need to test your home for radon. Just because you have a home with a passive system doesn't mean you don't have to worry about radon. You should conduct a radon test in the lowest liveble level of your home to make sure the radon level is below the EPA's action level of 4.0 pCi/l. MN Department of Health studies show that 25% of new homes with a passive system system test above the action level.
Activating the system may be required. If the radon level is high all we have to do is activate the system. That means we only need to install a fan in the attic and the passive system will be activated and it will become a very efficient and effective system at reducing the radon in your home. This is a simple process. We will also install a u-tube manometer on the system to alert you of the fan is not operating.
Visit the EPA's website for more information on Radon Resistant New Construction