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

https://telegra.ph/Why-You-Should-Never-Vacuum-Rodent-Droppings-in-Your-Attic-10-09

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.