radon crawl space 4

https://violetmetric.com/s/WQbFR_0DgzcieO5pJ7FEy

Our house had a musty smell in the basement, and after testing, we found high radon levels. The crawl space was the main culprit—a dark, dirt-floored void under the addition where radon seeps up from the soil. Sealing the crawl space ground liner and installing a sub-membrane depressurization fan made a huge difference.