Radon Mitigation for a home with cracked floors and open sump

Challenge

The customer in North Potomac MD was worried about high radon levels discovered during the process of purchasing the house. We were called to resolve the radon problem and discovered that the house had a professional radon test result of 10 pCi/L. Since the radon level was quite high, the job had to be carefully planned to achieve the desired results. The basement was also very large, which made it more challenging to achieve consistent results throughout the entire structure.

Solution

Upon site inspection, we determined that the basement had significant points of radon gas entry that needed to be addressed as part of the solution. There were gaps where the floor meets the wall and an unsealed sump pit cover.

Our approach was to seal 300 linear feet of floor-to-wall joints and install a proper sump basin cover to ensure the radon gas extraction system would work properly and prevent conditioned air from being sucked out of the house, thus saving energy for the homeowner.

After that, we proceeded to install a Sub-Slab Depressurization System to capture the radon gas from under the house and exhaust it above the roofline.