I live in a log home with a cathedral ceiling that has tongue and groove wood ceiling with a small space then sheets of white styrofoam then the roof. Well, for several years I have heard chewing and scratching sounds coming from the ceiling plus pulverized white stuff falls from the ceiling when it's really windy.
I had a pest control company come and sprayed lots of stuff, left and I still have critters above the ceiling. Help! I have visions of the ceiling falling down in about ten years if we can't figure this out and GET RID OF THEM.