i have read that letting them roost on the 4" side of the board is preferable, for foot stability & health. Also, in cold winters, all of their foot will be covered with feathers on a roost this wide preventing frost bite.So you are saying use the wider part of the 2 x 4 for them to roost on ?
I read somewhere a while back to use the the 2 inch side ...I will try changing the roost to see which one they like ..