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I have never heard nor experienced a squirrel chewing through 1/2" hardware cloth, nor a rat. Are we talking about the same thing, 19 gauge welded wire? Have you actually seen this happen?
This would be a new one for me. But that's not so unusual...
EDIT: After looking at your hoophouse in your blog (again, it's nice!), you mention that it is covered with chicken wire, which is not hardware cloth. Is that the stuff you are referring to as not being predator proof? If so, I agree.
My chicken fence consists of welded wire with 2"x4" holes 4 feet high, the bottom few inches buried, and poultry netting with 1.5 inch holes tied to it along the ground. The top is mostly open with a tarp at one corner for shade and rain. I don't have any problems with squirrels or birds mingling with the chickens. The roosters would tear them apart(and have, on occasion).