crawl space radon mitigation 4

https://yorkparadonprosradonsystemtalk.solsticebrief.com/posts/why-a-radon-system-follow-up-test-matters-for-your-home

When you find high radon levels in your crawl space, it's usually because the soil beneath your home releases this gas, and it seeps in through small gaps. The fix involves sealing cracks in the foundation and installing a vent pipe with a fan that pulls air from under the house and pushes it outside, often above the roofline. This creates a negative pressure zone that prevents radon from entering, and a manometer helps you monitor if the system is working right.