I think that people use a lot of different things for perches. I have read quite a few posts on this topic. Quite a few people have said to use 2X4's with the wide 4 inch part being used for perching. This is because the chickens can fit their feet on it and cover their entire feet with their bodies. This would be important during cold weather to protect their feet. It can be very cold here in the winter, so we did just that. Here is a picture of the roosts that my husband build.