Can spray on insulation be safely applied as a retrofit to an occupied home?

— Don Keith Fairbanks, AK

Answered by Bill Bradbury on January 31, 2012

What is the best green insulation to use in our crawl space?

— L. Stephenson Palos Verdes Peninsula, CA

Answered by Bill Bradbury on January 31, 2012

Is there an eco friendly removable caulk product out there?

— Carol Gonzalez Laguna Beach, CA

Answered by Cynthia Phakos on January 6, 2012