Signs of a Raccoon on the Roof In their search for food and denning sites, raccoons climb trees, exterior siding, and drainage pipes to gain access to rooftops. In doing so, the pests often leave smudge marks on downspouts and claw marks on the trunks of trees that help alert property owners to their presence. Additionally, finding droppings about three to five inches long on roofs can indicate infestation. Finally, individuals may spot adult raccoons or hear sounds like purrs, snarls, growls, chittering, and scratching. Damage When infestations of raccoons on roofs are present, they cause a fair amount of destruction. Females destroy fascia boards and shingles to find places to den. Rooftops provide easy access to attics, and raccoons may rip through vents and insulation to get inside. Furthermore, the presence of raccoons on roofs can be hazardous to human health. The pests commonly carry rabies, and their droppings contain raccoon roundworm, which can be deadly. Removal Since relocation and trapping laws vary from state to state, individuals dealing with raccoons on the roof are better off calling in professional help. Wildlife removal specialists not only have the tools and knowledge to remove the pests humanely, their services keep untrained property owners from getting injured. Professionals also sanitize areas affected by infestation to stop the spread of disease.