It is too slick, but I have heard that you could wrap it with strips of carpet and fasten with zipties. This gives them a surface that is grippable and they'll be able to sleep well.
I would take the top shelf off, leave the shelf supports in, and use them to install a roost on. I took used landscape timbers, ripped them in half with a table saw and laid the rounded side up as a roost. Also, maybe convert the lower shelf into a few nesting boxes...
I don't see any reason to not do it. Just make sure that there are no holes in the wall that is shared by the coop and the barn. Those birds produce ALOT of dust that'll get all in the barn if you're not careful
If you plan on totally free ranging, then you might be ok for just 4 birds. But if you're not sure, then you might want to spring for something more predator proof, or at least build a predator proof run with that coop as part of it. But honestly, that coop doesn't look like a great buy. You...
You'd probably be fine to leave the access to that open all the time, if it's predator proof. Once the sun starts to go down, they'll go up in the coop and roost on their own.
That actually sounds pretty tight. Around here on BYC, all I've ever heard is 4 sq ft/chicken in the coop and 10 sq ft/chicken in the run. (These numbers are for standards) Less than that and I've heard you start to have problems with the birds pecking at each other and so forth...
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Very nice! So, with sex links you you can tell sex by color, right? Just so I know in the future, what's the differences in color between male/female BSL?
I was thinking Buff Orpingtons and Barred Rocks. BO are very cold weather tolerant due to thick layers of feathers, and BR are also, but might be slightly better layers. Both are very docile.
Ron, what a great coop and run. Good job. Not sure if you've done the roosts in the coop yet, but being a gardner you might want to look at this: https://www.backyardchickens.com/web/viewblog.php?id=2427. Look at "inside the coop". Those roosts are over hardware cloth (and they don't walk on...