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How far below grade should I insulate my house's exterior? What material should I use?

— Mimi Barzen, Grand Rapids, MN

Answered by Mike Binder on March 5, 2009

Should I leave an air space between my attic insulation and the wood roofing?

— D.L. Bennett, Arlington, VA

Answered by Mike Binder on March 5, 2009

Weighing energy use reduction and life cycle assessment, which insulation types are best?

— Dwight, Dexter, Mich

Answered by Mick Dalrymple on April 24, 2008

How can I improve my roof's venting?

— Vic

Answered by Mick Dalrymple on March 6, 2008

Can I safely re-use old cotton batting for attic insulation?

— Paul Richard, Vancouver, BC, Canada

Answered by Dietmar Lorenz on April 5, 2007

I need to add insulation beneath my wooden floor. What materials or systems do you recommend?

— Eric Goldfarb, Belmont, CA

Answered by Dietmar Lorenz on April 5, 2007

Doesn't sprayed cellulose insulation tend to settle, leaving areas in the wall where there is no insulation?

— Beth Dyack, Stuart, FL

Answered by Lily Livingston on January 25, 2007

 
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