I don't have any silkies as of yet, so this is an interesting question! Thanks for asking, I'll keep following the replies!!
I have 10 full size chickens and 2 bantams, ones that are supposed to roost...but only a few of them do so...the rest pile on top of each other in a corner on the floor of their "house". As for the bantams, I am glad they sleep under the big girls, cause winter's coming, and they are japanese bantys, and not quite as "winter hardy" as my full size varieties. I have only one girl I am going to worry about as it gets colder...she sleeps away from the others, at the highest point in there, and is a leghorn, so she's much lighter and thinner than all of the other birds...hope she can keep herself warm, as i don't have electric out there. Keeping their water from freezing has not been easy!! Had to buy more waterers, and had to train everyone else at home to take out fresh water every few hours!! So far, it seems to be working...if only I could keep the ducks from splashing all the chickens' water out of the waterers!!(In "non-freezing" weather, the ducks have a pool to swim in and splash in, so they leave the waterers alone!!) As it got colder here, the ducks even pile into the chicken pile in the "hen-house".
I hope to get a few silkies in the spring...IF i can get my turkey pen/house and an additional chicken coop/pen built before spring!! Sure wish I could buy "sexed" silkies though!! I really don't want a bunch of roosters!!! I have one and he's fine, but if I had more, they would surely bother the neighbors!! (as if the ducks are not noisy enough!! But I do love them a bunch!!)