How would 2 x 4 welded wire keep
out predators such as , minks, weasles or rats ?
It won't keep snakes or mice out either, but I'm not trying to. I have an 8' x 12' coop that is pretty predator proof where I lock then up at night. I think I finally got all the places a snake could get in at night but that was a challenge. A weasel probably could find a way in if it tried but so far that hasn't been a problem. During the day with the pop door open anything that can get in the run can get in the coop. That's one reason I go inside the coop every night when I lock them up, to see what is in there.
In my 12' x 32' run during the day I'm trying to keep coyotes, foxes, bobcats, dogs, raccoons, possum, and skunks out. I'm not worried about the little critters, just the bigger ones. I did put chicken wire along the bottom 18" or so, more to keep baby chicks in than to keep other critters out. I have an apron of hardware cloth or 2x4 wire (whatever was left over) to stop critters from digging in. And it is covered so nothing can climb in. I don't consider this predator proof, just predator resistant. That's why I lock them in the coop at night.
I also have an area around 3,000 square feet inside electric netting where they spend a lot of their time grazing on the grass and chasing creepy crawlies. Flying predators haven't been a problem for me, some people have huge problems with flying predators. I used to free range without a big problem but then people sometimes abandon dogs in the country. I lost 13 chickens in two different attacks so I got the electric netting. It has worked against the bigger predators I'm trying to stop.
We are all different with different goals and set-ups. We are willing to spend different amounts of money. The larger the coop and run the harder and more expensive it is to keep everything out. Hardware cloth can be torn, for the doubters you might follow this link. Heavier wire that can stop bigger predators usually comes with some pretty big holes. One effective but expensive technique is to use both, a small mesh wire over a heavier wire that can stop almost anything. The title of this thread is about bigger runs, that double-wire method could be really expensive. 2x4 welded wire offers a certain level of protection, it just depends on what you are looking for.
Torn Hardware Cloth
http://www.backyardchickens.com/t/1105056/dog-vs-hardware-cloth#post_17001519