Is closed-cell foam -- sprayed in -- OK to use for an entire house in southeastern PA?

— Nelson Nafziger Parkesburg, PA

Answered by Sean Lintow Sr on May 25, 2010

How far below grade should I insulate my house's exterior? What material should I use?

— Mimi Barzen, Grand Rapids, MN

Answered by Mike Binder on March 5, 2009