Should the attic be vented or unvented in a new home with spray foam?

— Jevon Warner Robins, GA

Answered by Ted Kidd on November 21, 2011

I am thinking of supplementing the fiberglass insulation in my attic.

— Jerry H. Hopkins, SC

Answered by Michael Holcomb on September 22, 2011

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

— Karen Zebulon, NC

Answered by Matthew McCullough on February 22, 2011