Okay---I did what has posed a prol;lem for me for years, on one side of my backyarsd cottage. See---the guy who built that part many years ago was in a gbig hurry and took many short cuts, so did not close in the eves, beteewbn the roof rafters. As a consequence, you had squirrles and other critters---including blacksnakes---crawing around up there, after I installed a ceiling and some insulation up there, some 20 or 30 years ago. Plus, in addition to nesting, thery were chewing on the warrrin'. Well, I fixed the chewed-on warrin; and finally this week, I closed in the eaves, to prevent access by critters. Also, painted the eaves and caulked and used expanding foam to close up openings. Due to the irregular shapes of the openings that had to be closed up, it was time-consuming and the end result is more about form-over-function Buit, yeah. problem solved.