Ev-en-tually (taken too long already) this ceiling will be drywalled. Very next project will blow-in as much rockwool possible, figuratively speaking. Pitch height gives plenyty of room, over 11', at 4:12 eaves too shallow to crawl in and lay blankets. Using 10 hollow core doors that will be 'attic' access panels, they'll get blanket material.
No conceivable reason for anyone up there again.
Would like to utilize some of that, but we get some real cold periods. Not Arctic Circle grade, but...