A coop is what you normally call a chickens house. Its their kingdom! A hens castle. So you have to make sure to keep their house maintained at a four star accreditation for this will help the chickens grow healthy and happy. Therefore, to keep it the way it should be, there are specific requirements to cope up with to build a coop that will satisfy both you and your chickens. You, the poultry owner, of all people should understand this.
Regarding its design, the coop must be secured from any kind of predator. Every single angle in the pen sides, below and above, must be structured to withstand the wrath and longing of predators who are always on the lookout for a free meal. When selecting a wire mesh, be sure it is the right one. Predators are more than one. They scour within the area of your coop unnoticed just waiting for the time when they can attack. You have to make sure that the coop is impenetrable because some predators like raccoons just reach out for their prey, easily.
In connection with requirement number one, this is a continuation. Aside from predators, you have to secure the coop from those nasty rats....