How do you seal a crawlspace and remove radon gas from it?
I have a small crawl space, about 10' x 6' that is mostly gravel, and then an L-shape extends another 3' x 4' under some steps and is a thick concrete slab. I have a radon mitigation tube through the concrete slab (about 2' from the exposed earth) and weaves it's way to the roof (fan in attic). 3 of the crawl space wal...