Not needed down here, plus the chickens squat on their feet and keep their feet warm, i shaved the edges on my 2x2 to make them kind of roundm more comfertable for their feet, they can wrap their toes around easier also, the big one with the big birds are pin oak trees i cut down on my place, i put long 3" deck screws in the diagonals and just laid the roosts up their, so i can take them out if i need to
Mine use large-ish round dowels.