we have a drop soffit on the interior of our house wall that runs along an exterior wall where the roof line comes down. there is not exterior soffit in this area of the house. we are in the middle of a residing project and have discovered a water leak near the same area. the exterior is now exposed and we can see some damage to the under side of the roof sheathing. we have always had ice dam issues in this portion of the roof. Live in wisconsin and the area faces north. Can see in from the outside, that there is batt insulation in the drop. the kind that is fully encased in plastic. assuming that code and building practices have changed since the house was built in the late 70's....what is the proper way to insulate the drop soffit and give it an appropriate barrier to our warm house air from escaping into the attic and onto the roof sheathing directly above. the space is not accessible from the attic, as the roof line comes in too low there. Help is appreciated, we don't want the mold and rot to start (if it hasn't already ) thanks!