I guess it was about thirty years ago we started building on stilts. As you can imagine a house that stands seven feet off the ground, accessible only by ladder, is fairly difficult for a zombie to get into. When there were enough high houses, we started connecting them to each other with rope and plank walkways. It’s not like there’s any shortage of wood. Every week or so the sheriff and his deputies will pick off the zombies they can see through the gaps, and then climb on down and finish off the rest. Haven’t lost anyone in years.