Mr. (KWEE-ving) Connell also has some good insights into radon and as a law enforcement officer, into clandestine drug labs (he gives classes to HI's on how to recognize them and stay safe). 20% moisture is not really the magic number for fungal growth (according to him) because... 1. with a moisture meter, you aren't measuring moisture, you're measuring variations in conductivity. 2. actual moisture available to fungus varies with something called "vapor pressure", something I can't explain... 3. Some types of fugnus can extend rhizomes (act as straws for transporting moisture) for distances of up to 30' in order to import moisture to the material they want to eat. Anyway, his posts are always well thought out and difficult to refute. He occasionally posts on HI forums. He also acts as an expert witness against Home Inspectors in cases in which they've performed mold sampling. You should hear his little speach on Data Quality Objectives. If you don't know what those are, you'd better hope you never come up against him in court. He's never lost a case against a Home Inspector and he's happy to tell you how to avoid litigation involving sampling for mold. He's a member of the committees tasked with writing the International Mold Sampling Standards and the Colorado Mold Sampling Standards. He will talk to HI chapters. I've heard him. It's an eye-opener. Ask him.