Here are pictures from one of the few radon cases in 2010 we could not fix. In this instance we sealed the dirt floor, then sealed the stone wall and used one of our biggest fans. This was about 8 days of labor and hundreds of $ in materials. Radon levels remained unchanged. Result? The client received a full refund. Final solution? The homeowner himself simply installed a heat recovery ventilator in the living space. Radon problem solved and an expensive lesson for us.
Formerly bare dirt.....and not the radon source
Let's seal this leaky stone wall........
A few days later-sealed, but radon levels were unchanged....
Day 9: Complete system removal and refund
