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I also tested this, putting up a few different boards, one as wide as a 2x8 flat side up to see what would happen. My more dominant ones preferred the branches, but that was what they were used to . The less domnant ones, juveniles trying to get away from the dominant bullies, would sometimes use the boards. I kept them all about the same height so that was not a big issue. I put the boards on top of the branch so the board was slightly higher, but not real noticeable. The one surprise I got was that I set the 2x8 on end so the end was about a foot higher than the rest of the roost. I thought the dominahnt one or two would try to move up there. They did not.
I don't read too much in that mine preferred the branches. That's what they were raised with so I think they are just used to them. What I read into it is that it really doesn't matter whether it is a branch or a board.
For the record, the lowest mine have seen is (-)4 F outside the coop. I really don't know what it was inside the coop, but I suspect pretty close to that since I have a lot of ventilation and not many chickens in the coop for its size. No frostbitten feet.