We are using louvered vents in our cupola, the roof of it does extend out over so hopefully the rain won't get it. This is a lot of trial and error for us!Chicken jails or "henitentiaries" are a must. Ours is indoors for housing problem hens until we can re-home them or for watching a sick or injured chicken. How fancy to have a cupola. Is it open to the air outside? How do you keep out windy rain in those things?