how wide should the width of the roosts be? I have seen people post widths from 2" to 4". Right now I am using a 2x4 with the 2" side up. My pullets are 5 weeks old and are already roosting on it at night. So as they grow older would the 2 inches be too small for them to comfortably sleep on? Also my nest box ledge is about 5-6" higher than the roost but for now it is covered, but when I uncover the nest box do you guys think the chickens would rather roost on the ledge of the nest box? Thanks!