Black Knight, pros at rodent exclusion . Protecting your home starts with sealing every entry point — big or small. In this video, you’ll see one of our Black Knight techs performing professional exclusion work: filling structural gaps with expanding foam, reinforcing openings with heavy-duty mesh, and securing vulnerable roofline areas to stop rodents before they get inside. . Rats and mice can squeeze through holes as small as a quarter, and once they’re in, they contaminate insulation, chew w