I use heavy gauage welded wire for the exterior of my runs but I've used common chicken wire/netting to separate the runs. I've noticed recently how it rusts quickly. Yesterday I had to replace a 25' section because it had rusted so badly after only 2 years that my chickens had pushed it open and out of the staples and got through. Anyone else seeing this? or did I just get a low quality wire? Anyway, not using it anymore.