sub-slab depressurization 4

https://radonretestverificationsource.readspirex.com/posts/why-radon-retest-verification-matters-for-west-st.-louis-county-homeowners

Sub-slab depressurization is a method used in homes with radon issues. A pipe is inserted through the concrete floor into the soil below, and a fan creates negative pressure, pulling radon gas from beneath the slab and venting it safely outside. It's often the most effective fix, but installation requires careful sealing of cracks and joints in the slab to ensure the system works properly.