I'd like to add some insulation to my attic. I just had the house sided and re-roofed, so I now have a vented soffit and ridge vent. I know I will need to put in some rafter shutes, baffles or whatever you want to call them in between the rafters. I presently have about 7 inches of blown in insulation on my attic floor which is under the reccomended amount for S.Eastern Pa. So my question is this , Can I use unfaced batts on top of the blown in insulation running them perpendicular to the joists, or do I need to use more of the blown in insulation? Thanks.