Yes. I always wonder this too.  There is coop space, roost space and run space.  
My coop is 24 square feet.  My 2 roosts run 68 inches long right in the middle of this 24 square feet of coop space. Is this okay?
I have five standards and two banties.   24 divided by 6 is 4 square feet.  I used six, since the banties count as one Standard. 4 square feet. 
Yet, two 68 inches long roosts are right down the middle.  Each roosts gives them 11.3 inches of space.  Maybe I should take the other roost out and give them more floor space. I would think that they would all want to roost together at night. I was also told that they don't hang out in the coop during the day.
Part of my run is below the coop, which would be 24 square feet, It is 3/4 protected from wind and predators. The rest is open for them to access the outdoors, with an additional 24 square feet run space. This would give me 8 square feet per bird.  The coop moves on wheels, so therefore does that help with them not having 10 square feet?  Also I plan on letting them free range as often as I can. 
The roost and floor space is what is confusing.  Any pros out there to comment?
Thanks