Well it's been awhile but here's an expensive update:
We had a very well know (locally) barn/bat expert do a very thorough checkup on our barn and it's not good. Built in 2006, most of it is in very good shape but the previous owners added 'regular' insulation to the inside roof which gave a huge help to bats to live and breed. It appears that much of the roof has to be removed and replaced. The bat urine is degrading the wood. We're going back with metal studs.
Almost all the inside needs to be removed, spray washed and de-batted. This blew our barn update budget out the universe but the boss has horses coming in 2 months and it's gotta be done.
Check out the video of the roof ridge. They say there's 3 different species so we're going to get bat boxes put up so that when done, they have another place to live. We'll spray foam insulation so they have fewer places to live and of course, tighten up all the doors, windows, etc. so they can't get in.
I'm not happy about any of this!