I've been using a broom handle that's about an inch in diameter. It's 15 inches high, 8 inches from the wall, and four feet long. The problem is that my chickens are 12 weeks old and don't roost on it. Someone told me its because they don't like the rounded platform, so i was wondering what I should use. And if you say something like a 2x4, please specify which side is up.