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I had solid wood floor boards (covered in straw or pine shavings). Coop was raised off the ground several inches. Ran the hardware cloth for maybe a couple/few inches along the edge of the coop floor and then up the walls maybe 6 inches or so so they couldn't chew their way in where floor met wall. Also put it anywhere overhead where it seemed there could be a possible breach. Never again saw a rat. Of course, each set up is different and one would need to evaluate where the weak spots are. Would never want to see anyone's feathered friends get hurt