Duck run roof
A hawk may be able to tear through chicken wire and defiantly don't use plastic bird netting. I used 1/4 inch hardware cloth on my 16x16 run and think it worked good. Another cheaper option is aviary netting http://www.mypetchicken.com/catalog/Runs-Fencing-and-Netting/Aviary-Netting-1-25-x-25-p1107.aspx
Are you covering your run to keep your ducks in or predators out?The problem with chicken wire is that its woven and can be pulled apart (by predators). That's why you should use welded wire or hardware cloth around a run. The aviary netting in the link is advertised to have an 85 lb. breaking point and is supposed to keep hawks out. I imagine the rope is too thick for hawks to tear through, but if your worried about it you should try using hardware cloth. The 1/2 inch one is cheaper then 1/4 inch and will still be small enough to keep birds out with. Since you have such a large area and most rolls of wire are usually only 4 feet tall you can zip tie the pieces together. If this is only to keep the ducks in then chicken wire or netting would be fine because they don't have claws to tear through it.
Edited by chickluvinfreak - 4/10/16 at 6:10pm
Hope this helps...