Which one is better in the attic: cellulose or rigid foam board?

— Felix Laredo, TX

Answered by Randy Potter on January 27, 2011

The attic in our 2004 house has no insulation. Will spray foam irritate my asthma?

— Marie Richmond Hill, GA

Answered by Danny Kelly on December 2, 2010

Would batt or blown fiberglass insulation be the least toxic?

— Monica Mechanicsburg, PA

Answered by Andy Ault, CLC on November 2, 2010

Do you recommend bio-based soy foam insulation?

— Amy Alexandria, VA

Answered by Andy Ault, CLC on November 1, 2010