Doc Schoepp
Chirping
I have used 2x4 wire 'deer fencing' as the 'roof' over the run. The fencing sections are overlapped by about one 4in section and then secured together by zip ties. If something really wanted to get in, it probably could so it is more of a deterrent than anything. It has been successful at keeping everything out so far on a fairly cheap budget. Could switch to mid-weight wire ties but had plenty of little 3in ties around the house.