Everybody has covered this really well but you still seem a little confused so I thought I'd try to recap...
Yes, use the 2x4 welded wire - predators cannot get through it. However, raccoons and even cats can reach in and grab a chicken and pull it back through or the chicken will reach through the wire with it's head and get taken. SO, wrap the bottom two feet or so with 1" (not larger holes) chicken wire and bury that at least a foot (15 inches is better) into the ground.
Any place you can use hardware cloth totally stops all predators, but it is very expensive. (If you can make your whole run out of hardware cloth you don't need 2x4 wire.)
Good luck ... you will be glad you put the money in up front when you don't lose any chickens.
Yes, use the 2x4 welded wire - predators cannot get through it. However, raccoons and even cats can reach in and grab a chicken and pull it back through or the chicken will reach through the wire with it's head and get taken. SO, wrap the bottom two feet or so with 1" (not larger holes) chicken wire and bury that at least a foot (15 inches is better) into the ground.
Any place you can use hardware cloth totally stops all predators, but it is very expensive. (If you can make your whole run out of hardware cloth you don't need 2x4 wire.)
Good luck ... you will be glad you put the money in up front when you don't lose any chickens.