Choose your insulationIf you're finishing your attic, insulating it to the proper R-value can cause a dramatic loss of headroom if you limit yourself to fiberglass batts. To meet all three goals—insulating your finished attic, ventilating the roof and maximizing headroom—use a combination of dense batt insulation, rigid foam sheeting and air chutes.Most codes require a specified minimum amount of headroom, and it's tough to meet this requirement when insulating a finished attic, especially ...