Can I insulate between my floor and basement?
I've been to several sites and most claim you should not insulate the floor joists that are exposed in the basement, but rather insulate the walls, etc.
My basement is dirt and cement with only 6' head room in most places. There's a 5'x6' recessed cement structure with 2' cement walls (3" high on the dirt side) in the middle with a furnace on blocks and a hole with a sup-pump and around that is what looks to be a dirt floor. The walls are thick cement that have had a layer or 2 added in the past. Between 2 furnaces, 2 water heaters and 2 oil tanks plus all the hot air ducts and plumbing AND the new addition of a huge water treatment system for the well, I have no plans of using the space for anything beyond what it is. I can hardly stand down there! And the walls are mostly inaccessible for any insulation plus wall covering to enclose it. Without a boiler, there is hardly any extra heat generated by the hot air furnaces or anything else that might float upstairs.
I need to cut the cold! It's spring and lovely to know I won't need air conditioning this summer as it keeps about 10-20 degrees colder in the house then outside...but what about when it's -6 out there!! As I type this, my hands are frozen while it's a sunny 65 degrees outside!
What are the drawbacks to insulating the first floor joists down in the basement? Which way would any moisture barrier go? Can I just use some of the Styrofoam boards that might let me skip having to seal it in? With all the ducts, I can't drop a ceiling or I will end up with a crawl space!
BYW this is the 1875 federal with foundation problems!
Any info or ideas are appreciated!