I have a 1950's ranch in Upper Michigan. In one of the corner bedrooms, there is always at least of foot square area of large water drops hanging down from the ceiling. It doesn't appear that it is inside the drywall, just on the outside. I think it may be that the corner is not insulated enough. I was wondering if i could drill a small hole into the ceiling (into the attic) and spray some foam insulation. Unfortunately, money is very tight right now. Anyone had experience with this? Thanks...