Is it worthwhile putting spray foam between joists in my attic ceiling?

— Jim Doylestown, OH

Answered by David Willson on August 3, 2011

Do I need to insulate the floor of a workshop?

— Elizabeth Chester, NY

Answered by Michael Holcomb on July 18, 2011

Which is more energy efficient -- a metal roof or foam insulation?

— Rainey S. Wilmington, NC

Answered by Jason Kliwinski on March 7, 2011