How do you seal a crawlspace and remove radon gas from it?
...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 walls are cinder block, and 4th is facing interior of home. In the 10x6 section, the builder laid down concrete extending from wall on the floor for about 5", while the ...