The best permanent rodent exclusion materials for San Diego homes include sheet metal, galvanized hardware cloth

https://juliusjegv200.zenbloomer.com/posts/why-san-diego-s-climate-makes-roof-rat-proofing-a-year-round-job

The best permanent rodent exclusion materials for San Diego homes include sheet metal, galvanized hardware cloth, copper mesh, stainless steel mesh or wool, cement, and caulk for sealing gnaw-prone gaps.