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

https://augusttlpy976.moderncairn.com/posts/what-san-diego-homeowners-should-do-about-roof-rats

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.