Yet another article that pushes us away from any foam on the exterior of a home....
http://www.greenbuildingadvisor.com/blogs/dept/qa-spotlight/if-ants-rigid-foam-should-we-stop-using-it
http://www.greenbuildingadvisor.com/blogs/dept/qa-spotlight/if-ants-rigid-foam-should-we-stop-using-it