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sub-slab depressurization 4

https://radonsystemwarrantysource.dovetailscope.com/posts/what-a-radon-system-warranty-covers-and-what-it-doesn-t

Sub-slab depressurization is a method used to prevent soil gases like radon from entering buildings by creating a vacuum beneath the concrete floor slab. A fan system pulls air from under the slab and vents it safely above the roofline, which lowers the pressure so gases don't seep through cracks. It's a common fix in homes with high radon levels, often paired with sealing gaps in the foundation for better effectiveness.

radon levels illinois 2

https://extra-wiki.win/index.php/Finding_a_Reliable_Radon_Contractor_Near_Me_for_Metro_East_Homes

Radon levels in Illinois are a serious health concern, especially in northern counties where sandy soil allows the gas to seep into basements. Testing your home is the only way to know if you're at risk. Winter is a good time to test because windows are closed, trapping radon inside, and the state provides free kits through local health departments.