A couple of years ago a raccoon ripped open an eave vent in a cathedral ceiling next to the chimney and just above a casement window and moved in. It took awhile for me to catch on. I eventually caught and relocated several raccoons and had the vent repaired. I sleep just beneath that cathedral ceiling in the loft. B4 the repair I was able to sit in the casement window and hold a digital camera in the hole and snap a few pictures. It appeared that any insulation in there had been pushed back. I'm guessing fiberglass batts. The repair was combined with re-siding several months later, and the insulation was never replaced (my bad). I can confirm this in both winter and summer by reaching up and feeling the temp differential in that one 16"? run in the ceiling. I can touch the ceiling from the loft. I'm thinking about cutting a wide hole through the ceiling sheetrock and blowing some cellulose into that run. How doable is this (inside the house), and what alternatives are there?
p.s. there is some chance that I may reroof in the near future (hail damage). This roof is 2 1/2 stories up. Would it be easier to do this repair then? Of course the roofers in this area are swamped and want to do the roof and run to the next job.