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Galvanized is available on a much wider variety of mesh types. Yes, galvanized wire will still eventually rust, especially if you've been cavalier about letting the coating get scratched, but heck the vinyl-y coating can peel off and rust too. Honestly I have never in my life seen
coated hardwarecloth, anyway!
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Remember there are 2 different ways predators can get chickens. One is by actually coming into the pen. Obviously, pen size doesn't much affect that. However the other way is for predators to REACH THROUGH the mesh and grab hand- or mouthfuls of a conveniently located chicken (or if chicken has its head sticking out through fence...). With a really large pen like you have, as long as you're smart about locating roosts and feeders, your chickens aren't likely to spend much time within grabbing distance of the fence. So you can probably afford to worry less about reach-through attacks than someone with a small run.
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Why not just use regular ol' fence staples. You know, the kind you hammer in (recommend needlenose pliers to hold staple while starting it with hammer, unless your swearing vocabulary needs expansion), they're galvanized, come in different sizes but I'd use the standard ones that are, what, maybe 1" long? Faster, cheaper.
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Well, if you
did make your pen smaller, your time setting "extra" posts would NOT have been wasted. I have never known anyone with any kind of livestock whatsoever who didn't eventually, usually sooner not later, decide they need to fence in 'just a little more area'
But secondly... you cannot realistically make your chickens 100% safe. Everyone has different levels of safety they're comfortable with but
everyone is going to get a nasty surprise of
some sort
sometime.
Large-gauge 2x3" wire sounds to me like a pretty good basis for a large pen. Pin mesh to the ground vs digging like people have described (make sure it's attached TO the fence), and if you worry about weasels or grab-through attacks then run a 2' or 3' height of half-inch hardware cloth behind the larger wire. I am not sure there is much point in running your hardware cloth higher, though, because all it ends up doing is make the weasels climb a leetle bit further to get in, and honestly I think if you DO get some sort of mountaineering weasel he's unlikely to care whether it's 3' or 6'.
You will probably end up fine-tuning your pen roof arrangements too, once chickens are in. Some people have had problems keeping hawks out with heavy garden netting, let alone the fishing line you're talking about. Maybe plant bushes inside the run so chickens have somewhere to take cover? And if you should find yourself having daytime raccoons going 'over the fence', you might have to think about installing electric or engineering some other kind of coon barrier or scare.
But you can't predict or protect against EVERYthing. You just do your reasonable best according to your personal convictions, and keep an eagle eye out so that hopefully you can make necessary modifications before actually losing any chickens.
Good luck,
Pat