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metal siding, like the metal barn siding. You can find that used pretty cheap. But your gonna need that wire somewhere to keep light in. Also, my coop has 3 foot tall metal siding around the edge and then the rest of it is just 2inchx4inch, and that keeps in my jumbo cotournix.My Dad is helping me build a new aviary! We have up to 20' by 15' of space and I plan on using every inch! The flooring will be 1' grey concrete tiles, so it drains and is excape proof. I hope on double doors and a small heated area to keep smaller birds happy and dry. But I have one big problem.... The siding. its too expensive to put 1/2" hardware cloth over the whole thing. What can I do???