Is there a good resource for installing windows into ICF openings?  I'm especially interested in the differences between using a nailing fin on the outside vs .....can't remember the term....like a strapping that attaches inside the opening and how one would make the window water and air tight if nailing fins were NOT used.  Also, the InLine rep recommended setting the casement windows into the ICF opening a bit (they have 2 sizes of aluminum exterior extensions for this purpose...1 inch plus and around 3 inches....don't have the numbers in front of me).  Any feed back on that technique?  Thanks.  Cathy

What is the finish exterior material?

John

Hardy siding....concrete fiber.  We're using wood bucks for the openings.