attached OSB to the sidewalls and insulation above-metal sheds get too hot in the summer
The problem with a metal shed being a coop is well, that it is metal! So I bought and attached 7/16" OSB to the side walls from the outside with deck screws and when I was all done, with my grinder, ground off all of the points on the inside.
I bought 2" insulation for the ceilings and peaks to keep the summer sun from turning it into an oven.
The big window and pop door are now framed out ready for a window.
The door on the right that I will not use daily is latched top and bottom.
