IR cam + blower door + winter time is tons of fun! As it's been getting colder here I've been doing this several times a week.
For the record, my house is a conditioned 2,200 Sq. Ft. with a heat load of just under 19,000 btu/hr at -5. I haven't done much work on the top side of the place yet but there is just enough cellulose on top of balsam wool bags in the attic to cover the joists and some balsam wool bags in the walls. I have done some air sealing in the attic. Ha! Last week I found a wet wall chase that went plain from the attic to the basement. When I was closing it up some cellulose fell down the chute and ended up all over some of my children's stuffed animals down there.
Oh, and there is no record of anything like 12" of cellulose ever settling to 7". The manufacturer we use out here, National Fiber, lists the installed and settled depth and the settled depth is just above the densest recorded density. See:
http://nationalfiber.com/docs/CelPakSpecSheet1209.pdf