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A good point. I think my comments on attaching the hardware cloth with wooden strips are valid for attaching hardware cloth to vent openings, coops, the posts on open runs, or closed runs. A top rail on an open run could present a temptation.
well..if your not going to cover the top..why build a run at all?..if they can roost on the top rail,they will be out of the run in an instant,I assumed it was a covered run..even that cheap fruit tree netting stuff will keep chickens in.
I'm planning on an uncovered run...minimum 2500 sq ft (50x50) constructed of 2x4 welded wire. This will not require a top rail to keep from sagging...it may bow out some due to uneven terrain but it will hold it's top edge without a rail. I will be having large fowl chickens in the run and don't anticipate fly-outs to be a regular happening. With no rail there there can't be roosting on it, can it? If the chicken doesn't see something that it perceives is sufficient for him to land on then it won't fly up to it....a sparrow, yes, a chicken, very seldom. Besides, I don't think a chicken can hold onto a 14 gauge wire can it?? (I'm really curious about that question...can they perch on a thin wire??).
My reason for a run is to keep foxes, dogs, roaming critters from getting to the chickens while I'm away. Hawks and avian predators will be a wildcard and I will build covers in the run for the chickens to get under if need be. I may opt for the avian netting over the entire thing later on, but I doubt it. I've toyed with the idea of a smaller, more secure covered run (covered with 2x4 welded wire or better) that I could be used if we get a "problem hawk" in the area and would also thwart coons,etc. (but not snakes
), but it will come later after the larger run is constructed. The uncovered run will also keep the chickens from wandering off where they don't belong.
That's a few reasons to build an uncovered run. Uncovered runs have been used down here in the south for the last century or so...not sure of elsewhere.
???
Best wishes,
Ed