This little bugger is in my finished garage ceiling. It has a vaulted roof to the space above the ceiling sheet rock is about 6 inches and insulated. There are two small holes just along the ridge beam rafter, where the sheetrock and wood bean join.
Out of these two 1/8 inch holes comes small amounts of debris. Maybe about a teaspoon of dark "dust" over a week.
Is it it a trash door for a spider? For a mouse?
