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Is it okay to spray open-cell foam over a layer of closed-cell foam?

— Steven L'Heureux Richmond, VA

Answered by Danny Kelly on August 30, 2010

I recently had blown-in cellulose put in my attic. Can I install batt insulation over it to increase the R-value?

— Jon Tyler Bristol, RI

Answered by Danny Kelly on August 30, 2010

I live in an attached house (on both sides). Do I need to insulate my basement?

— DESIREE GARY Saint Albans, NY

Answered by Danny Kelly on August 24, 2010

How do you insulate a home in Michigan that has a cathedral ceiling with exposed beams and no insulation? Roof is shingled.

— Claudia Ruehle Lansing, MI

Answered by Danny Kelly on August 24, 2010

When insulating interior basement walls, do you need to insulate below the frost line? Or does the soil act as a natural insulator?

— paul Sellersburg, IN

Answered by Florian Speier on July 30, 2010

Is fiberglass insulation or blown in insulation the best?

— Susan Franklin, TN

Answered by Randy Potter on July 1, 2010

I need to replace insulation. I'm chemically sensitive and need product suggestions.

— Laura Quincy, CA

Answered by Kati Curtis, LEED AP ID&C, CID on June 28, 2010

Are national funds available for taking off or covering old asbestos siding? How hazardous is handling old asbestos siding?

— B Mac Dallas, TX

Answered by Rick Goyette on June 9, 2010

A new neighbor says they are building a green home. Why is the contractor using Styrofoam?

— Ken Richmond, VA

Answered by William Fry on June 6, 2010

How do I insulate uneven stone basement walls in a rehab row house in Philly?

— Alden Blyth Philadelphia, PA

Answered by Polly Osborne, FAIA, LEED AP on June 6, 2010

 
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