do you insulate interior floors?

redss said:

I'm going to be adding a floor for a bedroom above the livingroom, and am curious, should there be fiberglass insulation between the studs?

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Not particularly. Millions of houses have been built with no insulation between the floors. I would insulate the rim joist around the exterior areas though.
Ron

I have R25 insulation between the 1st floor & 2nd floor
I didn't install it, but it does keep the downstairs much warmer then the upstairs
We do not have a seperate zone for upstairs heat - at present only 1 radiator up there
I like the bedroom colder for sleeping, wife has an electric blanket

It is not needed & most people do not install it
It also serves to deaden noise

I would agree with the other post but add this like they said its not ness. But if you have a room like I did that had two openings to the garge and a set of french doors to the outside then you might want to do it.I had a heck of a time keeping that room warm so when I redid it I did insulate above it.this has help keep the heat in that room and not just rise to the room above which was hot as hell anyway and this has helped a great deal also made it quititer which I like since it is more or less a game room

Insulation, while not necessary under the circumstances you describe, might be useful as a sound barrier. Since insulation is inexpensive and easy to install, I'd consider it.