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radon in slab foundations 2

https://sierra-wiki.win/index.php/Practical_LEED_Builder_Radon_Advice_for_Pennsylvania_Projects

Radon in slab foundations happens when the radioactive gas seeps through cracks or gaps in concrete floor slabs, especially in homes built directly on soil. Since the slab sits on the ground, any openings around plumbing or expansion joints can let radon inside. Sealing those gaps and installing a passive vent pipe system can help reduce the risk, but testing is the only way to know for sure if levels are safe.