The basement "ceiling" is simply the underside of the main flooring - exposed 2x10's about 7 ft ten inches above the concrete floor. I have a fire place down there that houses a fire-box insert/stove wich I used to generate a portion of the heat used in the colder months. THere is also an oil-fired furnace at least 40 years old with metal ductwork hanging beneath and (where running parallel with) between the joists.
I've been thinking of installing insulation between the joists. My first thought was to simply buy the 15" wide six-inch thick rolls and staple the paper to the underside of the joists much like I've done on the verticle walls we've insulated over the years. This would leave a brown paper** "ceiling," six inches of fiberglass, four inches of air space and, finally the sub-flooring.
Then I recalled that the paper/moisture barrier was to face the heated side of the structure (when doing 3.5" rolls in the walls) - our wall studs are two by fours - not six inches!
Do any of you know 1. If insulation here Under the flooring) is a good idea, and 2. if stapling batts or roll insulation as described is "the" or "a" right way to go about it?
** The next step would be to install drywall or similar paintable material to achieve a white ceiling down there.
Thanks for the (anticipated) helpful feedback.