I live in an elevated rancher built in 1978. I just removed carpeting
and linoleum from my breakfast room, kitchen, dining room, and living
room, all of which are open to each other. I had 3/4" red oak planking
installed over the existing plywood subfloor.
Winter season has come, and it has been unseasonalbly cold, and I really
notice it in the rooms mentioned above. I don't know if it's because the
wood transfers hot/cold more than what was on the floors, or because of
the really cold weather. I'm in the S.F. Bay area, where winters are
normally mild (40 - 50), and my furnace usually heats the house fine, but
now it takes an hour or so to heat the house (20 year old gas heater,
forced air, below in the garage). When I wake in the morning, the house
is 56 - 60, and overnight temps were mid-30's to low 40's.
I'm considering insulating the crawlspace under the house, under the new
wood flooring. I have good access to all areas under the new wood
flooring, and to all exterior walls. I can walk under the entire area.
The floor joists are 2 x 10 (1 3/4 x 9), and the wall studs are 2 x 4 (1
3/4 x 3 1/2). I've been reading a lot about insulating crawlspaces, and
some say just need to insulate between all the joists, and others say
best to insultate just betwee the studs. Of course, doing just the studs
would be much easier, since it's doesn't have to be 'hung', and less
expensive, since the insulation wouldn't have to be as thick.