What color is that lighter color in the photo? Silver or white? The end of that rafter (where half of the ridge board fell out) looks to be the lighter color also.
As soon as you said "thick paint" I knew it was none of the reasons I thought of, but it did bring up another "thick paint" (white, though, not green) condition I've seen before - supposedly some type of treatment for "mold" ... it was sprayed on *THICK* ... and on everything, including the NM cables, PVC drains, CPVC supply piping - and there are a lot of non-compatibility issues with those items and things they come in contact with, much less are "thickly coated" with.
I'm thinking less and less 'fire' or even 'grow house' (there is no reason to paint everything green for a grow house, that's just a waste of money), and thinking ...
I have no friggin' idea.
