Here is what I plan on doing with my garage ceiling and am looking for any advice anyone can give me. There is a bedroom above the garage, and the garage ceiling is 14" engineered joists. I have drilled a couple of test holes in the garage ceiling to see what is up there, and there is a good amount of batt insulation above the drwyall with the paper facing up. I am going to drill a hole at each end and the middle of each joist space and blow in cellulose to each cavity both directions. By sticking my hand up there and moving the batt to the side, I can put the hose in to blow it above the paper and fill the rest of the cavity. There are 2 exteriror walls on the garage, and I plan on making sure insulation gets packed in very well on those two areas which is probably where the cold air is coming in from anyway and traveling down the joists above the insulation. It should move along easily since the paper side is up, and fill the remaining space above the batt insulation. Simply put the circles back in place from drilling them with a hole saw and patch them up. This should add additional protection from cold air in the garage, and should also solve the problem of cold air moving down the joists areas. I know others who have done this with great success. Any thoughts or suggestions?