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radon systems for stone foundations 5

https://myradonretestafterjournal.fotosdefrases.com/why-a-radon-retest-after-mitigation-is-critical-for-your-home-s-safety

Radon systems for stone foundations are tricky because the uneven surfaces and gaps in stonework allow radon gas to seep in more easily than in concrete. A typical system might involve sealing major cracks with polyurethane foam, then installing a sub-slab depressurization pipe through the floor slab above, drawing radon from below the foundation instead of trying to seal every stone joint. It's important to test the air after installation, as stone foundations often have complex airflow patter…