Answer: It seems as if it is a plausible solution, but you will need to figure out how much weight you would be adding and then have a qualified structural engineer determine whether the ceiling joists could handle it.
You are talking about a lot of weight coming down if it doesn't.
You also should ask an insulation contractor if adding properly installed foam insulation board (under the formerly uninsulated dining room overhang in my house, for example) will truly enhance energy efficiency.
Sometimes, layering insulation does little and might inhibit proper air circulation.
Get expert opinion before you act.
Q: My question concerns formaldehyde in kitchen cabinets and wall-to-wall carpeting.
We're planning a kitchen remodel and will need new carpet soon as well, so I've been looking at lots of magazines and articles online that have indicated concerns related to the presence of formaldehyde in plywood used to construct cabinets, in other building materials, and synthetic carpet.
How seriously do your sources regard this as a problem? Does it mitigate relatively quickly through "off-gassing" of the vapors? I am concerned for our family's health, and don't want to compromise any future sale of our home or waste money on materials that may be banned, but I get the feeling formaldehyde-free materials are more expensive and I am on a budget.
I've lived through bans of previously widely accepted materials, such as lead-based paint, aluminum wiring, asbestos, as well as greater understanding of problems we previously didn't know existed, such as radon, so I know that just because something is used everywhere doesn't mean it's safe.