Comment How does one find what are the risk areas? (Score 1) 2
I am pretty sure you looked here: http://en.wikipedia.org/wiki/Radon , but it is a starting point. Also the site you originally pointed to has some kind of solution here: http://handyowner.com/2008/08/17/installing-a-fan-based-radon-mitigation-system/
How does one find what are the risk areas?