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So -- chicken wire, hardware cloth, hog wire -- ack! That's a lot of metal. (looks around for CR)
Chicken wire -- is braided, the openings are hex shaped, it is easily pulled apart by animals that have paws or hands. It will not withstand much weight. It is normally used to confine your chickens, or deny them access. Buried, it can be a deterrent to animals that might dig under a fence or wall. This is the least expensive of the wires. I only use it to contain/deny.
Hardware cloth - is welded and has square openings. Most folks use 1/2" openings as 1" will allow for a raccoon to reach in and eat your bird one handful at a time. Too many folks on the Predators forum have reported this happening for it to be 100% conjecture. It is the most expensive of the 'wires'. I use this for windows/doors and other openings that will be exposed at night. If I am constructing a predator secure run, I will use this wire on the first 24" (ground up) to guard against the above mentioned reach-through diet. The rest of the run I'd use either chicken wire or hog wire.
Hog wire - welded, pretty thick wire (CR can tell us the gauge) usually 2"x4" openings. This stuff is pretty sturdy. I use it and short PVC lengths to quickly put up a temporary run. It is often buried as a digging deterrent, and works better than chicken wire at this task.
I buy my wire online at csnstores.com, shipping is often free and the prices are very good. (I also buy 100' rolls)
All that said --- when I build coops I don't use OSB as the flooring. I use plywood. I feel that OSB is more susceptible to moisture absorption than plywood, and it's moisture that you want to avoid. I suggest 3/4" plywood as your flooring. If that's more than you want to spend, then stay with plywood, as thick as you can. I use OSB as the rest of the sheeting on the coops I build. Plywood or OSB, be sure to give it a good coat or two of paint. I like latex because it is easy to clean up and is non-toxic when dry. Consider vinyl flooring, call the stores and ask if they have scraps. It is water proof, and easy to clean. Most have a mild texture so they are not too slippery for young chicks.
Lots of folks (me included) give their wire different names. I know people who have no clue what I mean when I say "hog wire" and their idea of chicken wire is what I call hardware cloth, and my chicken wire is their stucco wire.
Dave
PS - I don't put wire under my floors -- but I also keep my coops at least 2' off the ground. You should too
Great info Dave, thanks so much! I wish I could have a raised coop, but I have to make do with the shed we have already, and it's too heavy to raise up 2 feet, and I want to be able to walk in it too. I will go look at csnstores.com. Thank you for your time and wisdom!
Someone asked if we have a mice or rat problem. We have a lot of field mice in our field and by the barn. Hubby found a nest of babies the other day in some long grass by the compost pile. That is close to where the shed is (that will soon be the coop). So I am sure they will be attracted by the chicken feed.
For those of you with hot wires, do you have small kids? My grandsons are all three and under, and I don't want them to get zapped! A hotwire around the top of the pen might be okay, but I'd like to try without it first and only use it as a last resort. I want the coop to be kid-friendly since the kids are one of the main reasons I am doing it!