I've assembled a 20' by 20' meat chicken run from dog kennel panels 6' tall. I need to cover the run with something to keep out predators. I need some suggestions. On my 6' by 20' hen house pen I just wrapped chicken wire up the sides and over the top (width way, not length way). But being a full 20 feet to span on the meat bird run I think I would have too much sag and too many seams to wire together. I would prefer to have a one piece, seamless top. I was thinking about using flight pen material. How would this hold up to snow load and also, would it keep out racoons? Anyone have any experience with flight pen material on their runs? Any other ideas? Thanks!