I have the silliest chicks ever!!!! Their ages are 10-17 weeks old. All 8 of them can not sleep on a 2x4 with wide side up! They try and pile together(in their seperate groups) and fall off because 4 inches is not wide enough! The roost is not high off the ground(about 2.5feet), so my frizzle Cochin can get up and down no problem. Since it wasn't working out, they all insisted in sleeping in the nest boxes. I had dh cut another 6x2 piece of wood and I put the flat side down. Now my chicks have a 10 inch roosting space! It worked! To my surprise, they are pooping at the back end where there is about a 3-4 inch gap from the roost to the wall. I thought roosting was a natural instinct for chickens. Not mine, they'd rather snuggle up together.