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radon mitigation for stone foundations 3

https://post-wiki.win/index.php/LEED_Builder_Radon_Advice:_What_Green_Builders_Need_to_Know_About_Radon_in_York_and_Adams_County

Radon mitigation for stone foundations can be tricky because the gaps between stones and the soil below easily let radon gas seep into basements. Sealing cracks and joints with specialized polyurethane caulk helps, but a stronger solution often involves installing a sub-slab depressurization system with a fan that draws gas from under the foundation and vents it safely above the roof. It's important to test radon levels first, since each old stone foundation behaves differently.