Re: Fiberglass vs cellulose
I prefer fiberglass properly installed with bats between the joists and another layer running across the joists. Cellulose, while it does do a great job filling voids, settles over time. You can blow in 6" of cellulose and in just a few years it settles and you end up with about ½" plus it's a nightmare if you ever get a roof leak. By far the best choice would be closed cell foam. It has a greater R value per inch, fills all voids, seals along joists, and is almost structural.