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| For a 6" slab they will work fine. They need to be in tje bottom 1/3 of the slab for good reinforcement. I have poured hundreds of thousands of square feet with 8 and 6 gauge panels, the same as hog panels, just bigger. If they are really rusty thpugh, get rid of them. If just surface rust they will be fine.
Mesh is for reimforcement, not structural bridging strength. Make sure you have a good base and good panels and they will work well.
There is no.such thing as too much reinforcement unless it takes up roo. For concrete. You'd be amazed some of the structural stuff I have poured and the rear used.
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