Can you offer feedback on an idea for insulating my home's walls?

— Ron Beck Appleton, WI

Answered by Danny Kelly on December 2, 2010

What's the best product to use to seal ductwork?

— Daniel Shugrue Somerville, MA

Answered by Elliot Seibert on November 25, 2010

Would batt or blown fiberglass insulation be the least toxic?

— Monica Mechanicsburg, PA

Answered by Andy Ault, CLC on November 2, 2010

We have an unheated crawlspace under our house that we would like to insulate.

— David Davison Middleburg, FL

Answered by Florian Speier on October 1, 2010

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