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radon crawl space 9

https://getradonarnoldmocentral.moderncairn.com/posts/why-homeowners-in-radon-arnold-mo-should-test-for-this-invisible-gas

We noticed a musty smell coming from the crawl space and tested for radon—levels were higher than the EPA action limit. We sealed all the vents and installed a sub-membrane depressurization system under the vapor barrier, which dropped the concentration from 6.8 pCi/L down to 1.2 pCi/L within a week. The plastic sheeting and fan setup cost around $900 and took an afternoon to install.