I elected to cover my run in 2"x4" welded wire. Yes, the initial cost is much more than the netting, but it's not going to rot in a few years, and have to be replaced either. I attached it to the frame of the run with aluminum electric fence wire, as zip ties also tend to rot. Also, if you have trees in the run and a branch falls off, it may take down all the netting. Keep in mind too, that the Cooper's Hawk will go after a bird on the ground or in shrubs, that's what they are built to do. I have a pair here that will make a daily swoop over the property looking for a chicken buffet, so I don't release the chickens until after "hawk hour". My cats hang out with the chickens, and even though most of them are smaller than the chooks, they seem to be a deterrant for the hawks. Good luck!