So when I moved into my high ranch home last year I did some renovations. One thing I noticed was that my attached garage was not heated and was afraid it would make the upper floor cold during the winter. Since the ceiling and walls were down I decided to insualte with roxul comfortbatt on the ceiling/rafters since they were fire resistance being that it was a garage and the boiler room was right next door. Also our three bedrooms are right above this space. However, this past winter it seems as though the boiler room kept the garage space pretty warm and maybe cold temps wouldnt have been an issue. My concern is did I create a potential moisture issue in the ceiling? The space was filled completely from the bottom of the 2nd fl subfloor to the sheetrock of the garage ceiling. I also had one side that was cantilevered out which I filled also. Does this space need air movement like the way an attic does?