All I know is that any other improvement to insulation, (better doors,
better windows, walls stuffed, attic R level raised) have shown a
marked and noticeable difference both in utilities and comfort. The
floor joist job was a 1 on a scale of 1-10 with 1 sucking and 10 as
fantastic, if I had it to do over, I'd just have thrown the same amount
of insulation into the attic.