We live in Greendale, WI in a 1960 trilevel that was slapped up during a huge building spurt. The home was built with minimal insulation and now has the large heating bills that go with it. The living room has a sloped ceiling, 12 feet on the west end, down to 8.5 on the east end. There is nothing but drywall and roofing in this space. We just had the roof redone and there was no space at all under the shingles to lay any kind of a barrier. We also have 24" on center framing on this part of the house. Would it be worth considering putting on foam insulation inside the living room ceiling and then putting in a second false ceiling below it to keep the heat in the house? Who would best be able to judge if the structure could take this extra weight?