Hey, chickhan - this place has TONS of info on it, and lots of helpful people. I agree with the others - a fall from one foot in height should not have done this, at that age mine were flapping UP 2+ feet.
If the roost has anything to do with this, I'd guess the roost may have fallen ON the chicken to cause this much damage. Or someone accidentally shut the bird in your coop door and didn't tell you. Or someone kicked it. This is NOT from falling one foot. If the roost fell before and MIGHT have done this, you need to make sure it doesn't fall again - has it been secured?
If you want to post some pictures in the "What Breed or Gender Am I" section, we might be able to help you identify your birds. Then you can learn more about the breeds and what to expect (final size, egg-laying, friendliness, etc.)
Sorry for your loss.
Post ANY questions you have (What should I feed? Do I have enough room? is this a good setup?) under appropriate forum boards and you will usually get lots of good, helpful answers.
Attaching pics can really help, particularly in the What Breed or Gender area. I can't remember exactly how to do it, but I know there is a post on the boards (I think it's in the What Breed or Gender board) that tells you how.