Before I ask my question, here is a quick rundown of our run and coop: 24x24 horse corral cut in half (PVC framed wall). Entire thing is ground to ceiling chicken wire over 2x4 mesh. All covered by a corrugated steel roof. We essentially converted a horse stall into a chicken run. We also inherited a Prefab chicken coop building (one of the kind you can buy online). It has a small ramp up to it with a roost inside followed by two laying boxes. This is on one side of the run. Here's the issue: our five chickens (which are free range during the afternoon) roost on top of the prefab Chicken coop (on the ridge line). They don't sleep inside. We are in San Diego so the weather most of the year is perfect for this. However, when it rains (funny thought with a drought) the wind and rain come in sideways leaving no shelter for the chickens. They just don't go inside the prefab "cute" coop. Does anyone have a suggestion for building a three sided roost? It would need a small roof over it too. Am I being ridiculously worried about my chickens getting wet, especially based on my location (ramona - San Diego county)?