<3ChickenS<3 :
I've read a lot of posts saying chicken wire isnt strong enough or they lose their chickens due to predators getting through. i have fox, raccoons, coyotes, snakes and I'm sure a lot more... Not much for daytime predators other than my own dogs and the neighbours 15y/o dog. Will chicken wire be strong enough as long as my girls go into their coop at night with their automatic door?
A whole lot of BYCers lose their chickens to their own dog. Or the neighbor's 15 yr old dog. Or some other stray dog that wanders by and either your own dogs don't mind it being there and want to join in the fun it starts, or it wanders by when your own dogs are not out.
So if you use just chickenwire, you need to recognize that your flock is not particularly protected from any of this.
Everyone has their own feelings about whether that is ok. If it's ok with you, use chickenwire; if you'd really kick yourself if/when something bad happened that stronger fencing could've prevented, then use stronger fencing. 2x4" welded wire is a reasonable compromise between safety and budget; add something smaller-meshed on the bottom 2-3' to prevent reach-through and you have pretty good security as long as the chickens are unfailingly locked up before dusk every day of their lives.
The wire will be dug down, but what is the minimum depth it should go?
An apron is really WAY easier to do than burying the bottom of the fencewire, and works pretty much as well (provided it's done right, of course).
If you truly want the cardiovascular workout of burying the fence wire, it takes 18" depth to protect against most predators (a few 'professional' foxes or dogs may still go under it in some soils, but you are unlikely to have that situation).
If you do an apron, I would suggest 2' as a minimum and wider is better. Make sure it is REALLY securely attached to the base of the run fence, and bend the outer edge down a little so it's not obvious, and either peg the whole thing down real well til the grass grows up thru it, or cover it with mulch or gravel or stones or concrete rubble or a flowerbed or whatever floats your boat.
Good luck, have fun,
Pat