Radon Mitigation Defects Found during a Home Inspection

Here’s a one year old builders warranty inspection. This is the passive radon pipe that’s not installed correctly. You can see that the pipe terminates at the vapor barrier. It should be below the vapor barrier. We see this often. Here’s a link for the proper installation. https://www.epa.gov/.../files/2014-08/documents/archdraw.pdf

This one is a little better with the EPA installation instructions. Still needs to be under the vapor barrier. This is doing nothing for radon mitigation.

This one is taped up with a vapor barrier, but its above the other vapor barrier. The lower vapor barrier is what’s used to funnel any radon gas to the passive system like a chimney to the pipe, and out to the exterior. Recommend repair.

This image is of the upper part of the passive radon mitigation on a new build in the crawlspace. They had the lower part installed correctly per EPA installation instructions. Except they terminated it in the crawlspace just below the sheathing, instead of routing it to the roof and exterior. Recommend repair.