I'm trying to figure out how to comment on this. I've gone from 15 chicks in a Wal-Mart pool brooder in the house, to an 8x8 solid wood walled coop with an 15x20 chicken wired coop (which only the brooder protected against those bastard coons), to 90 hens/turkeys in a 24x24 wood and hardware clothed coop and open run. I've had no predator issues in the coop.
So, on a small scale, if you really want to keep raccoons away from your chicks/pullets. Make a pen sealed with hardware cloth - 1/4 x1/4 inch fencing. Chicken wire is ONLY good enough to keep chickens in. All the predators can just rip it right off and rip apart your chicks/hens. If you're on your back porch, find some way to seal them in with good wire fencing. Even horse fencing, temporarily, will be better than using chicken wire, for anything.