Can you use blown cellulose overtop of fiberglass insulation?
I have a room over my garage that is unfinished (just a finished floor, no walls, you can see thru from one end of house to other). I just use if for storage as it has a stairwell entrance from inside the garage. It gets unbelieveably hot or cold, depending on the season. It currently has fiberglass insulation between the joists, Im wondering if I can increase the insulation or if that is of no use since the stairwell is open.