@SonoranChick i just remembered a chicken eating horrible stuff story that might make you feel better
On the buff coop up top 4 ft high I used spray foam to seal something. It was 4 ft high and the buffs can barely jump up to their 2 ft roost so I figured its fine. Few months pass by and the eggers are integrated and now you know where I'm going I forgot about it, it's dry but still there and they can jump up on top and I came in one morning and 5 were interested up there when I go what ya eating and to my horror they were snacking on the dry foam breaking off pieces!
I covered the rest up so tgey coukdnt get to it and felt worried but no one got sick