Which material is most effective for rodent-proofing openings in the exterior of a building?

Rodent-proofing openings in the exterior of a building is crucial for preventing pests from entering and establishing nests. Copper mesh is an effective material for this purpose due to its unique properties.

Rodents, such as mice and rats, are excellent chewers and can gnaw through many materials. However, copper mesh is difficult for them to chew through because of its sturdy, resilient texture. When used to fill gaps or openings, copper mesh not only creates a barrier that rodents cannot easily penetrate, but it also has the added benefit of being resistant to rust and degradation, which ensures long-term effectiveness.

Additionally, copper mesh can expand and conform to irregular shapes and sizes of openings, providing a more comprehensive seal against entry points. This adaptability enhances its utility compared to other materials that may not effectively cover gaps, allowing for potential access for rodents.

In contrast, foam insulation, plywood, and fiberglass insulation may provide a temporary solution but are often not sufficient barriers against rodents due to their relative softness or vulnerability to gnawing. Thus, copper mesh stands out as the most reliable choice for rodent-proofing exterior openings.