I am currently remodeling a 2nd Story Bedroom of my 1930's house. I have all the walls open in this room right now & am thinking of my insulation options. The house was sheathed with planks so there are a lot of large gaps (1/4" or larger) where air can easily penetrate. I understand that insulation works on the concept of dead air space. The house is sided with Aluminum with a very think layer of styrofoam insulation (no wrap). I am looking for a way to stop these drafts before I add bat insulation. Does anyone know of any products out there that address this problem. I made the mistake of ignoring this problem when I remodeled another bedroom: I was very disappointed with the cold air that was entering the room after I insulated the walls with R-13.