U.S. Fish and Wildlife Service, Resource Publication 143. Northern Prairie Wildlife Research Center Home Page. Research Needs Bat Management Legislation Acknowledgments References Appendix A . Identification of bats most often encountered by humans in houses Appendix B . A summary of State bat legislation.
Bats enter under eaves, at badly fitting ridge, and under shingles, slates, tiles.
Constantine's batproofing valve-like device. Constantine's valve-like batproofing device placed in various installations. Ventilators should be properly screened. A properly insulated roof will keep bats out. Gaps under corrugated and galvanized roofing may be sealed with a self-expanding urethane foam, fiberglass, and resin.