How do you seal a crawlspace and remove radon gas from it?
...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 remaining part is the gravel. So, imagine the floor is a picture on your wall, where the frame is concrete while the photo itself is gravel/earth.
Que...