For my cages, I didn't use the melamine shelves that was of cheaper quality like at Lowes used for just shelving. The melamine I used was 3/4" thick. I've seen shelving that was thinner, but I decided it was't that great for caging. The 3/4" stuff that comes in different sizes in the lumber section at Home Depot is better than regular shelving. It is very heavy, and I have had very good luck with it. 3/4" finished plywood is the nicest option, but it is more expensive and alot more work to make it waterproof. Derek

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