A house I’m designing in Illinois, south of St Louis, needs to have a radon mitigation system. The best practice recommendation for radon mitigation, per EPA, BSC and everyone else, is to install a passive ventilation stack from a basement drain tile loop all the way through the roof. We’ve all seen the details before many times.
My question is, if I install an outside AND inside perimeter footing 4″ socked drain tile dumping water into a sump basin, I could assume that radon will go to the sump basin as well. So could I seal the sump basin lid and drain pipes and install a radon vent out of the sump basin instead and dump it outside the house by the rim joist? Or do I still need to have a separate vent stack?