That depends on what pests/predators you deal with, and if a fully predator proof run is needed (i.e. chickens don't get locked up in the coop at night). Weasels and rats can climb, for example. I only have hardware cloth up the bottom few feet of my fence to prevent raccoon reach ins, but rats do occasionally get in.I would do the 1/2" HC horizontal apron, but not go up the walls 6ft with it; you only need ~2ft height on the walls of HC to protect from predators like a raccoon reaching through and grabbing a chicken.