Originally Posted by nealtw
t. Adding insulation between floor and ceiling would for noise and not really needed.
In this case it is needed for more than noise. The liveable attic room does not cover the whole lower story (not even close). It is in the center of the house with with quite a bit of non useable attic space around it, so the insulation is needed for the ceiling on the lower level. I'm just not sure how concern I should be with the attic room floor.