Copper mesh would be so expensive that it would be impractical - copper prices are extremely high right now, we even avoid copper wiring whenever possible. The solution is usually thicker cloth. The thing that is funny about the squirrels chewing through hardware mesh is that it is very regionally dependent - some areas they will just give up, but in some areas they are so intent to get back to that wiring that they’ll hurt themselves trying to chew through 18 gauge steel hardware mesh. Maybe something to do with the time of year they are barred from entry, or competition for resources among squirrels?
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