Which is best for an attic: closed or open cell spray foam?

— Karen Zebulon, NC

Answered by Matthew McCullough on February 22, 2011

Is there a standout spray foam insulation brand? Or one to avoid?

— Gil Morelle Alpharetta, GA

Answered by David Edwards PhD on January 13, 2011

I'm converting a school bus into a motor home. What's the best way to insulate?

— josh jackling Perris, CA

Answered by Cynthia Phakos on January 6, 2011

How do you insulate a home with cathedral ceilings?

— Howard Troy, MI

Answered by Kevin Holdridge on December 20, 2010