The roof on my run is corrugated metal sloped at about 35 degrees. I didn't need to shovel the roof this past winter, however we didn't get the heavy 2 - 3 foot snowfalls. I do have a roof rake and an electric snow blower for the path to the chicken coop. My big snow blower that I use in the...
I agree with @jthornton. Also, consider that your chickens will likely spend more time inside the coop on the coldest winter days and they will need extra space to minimize grumpy, claustrophobic hens. Another thing. What is under the run to prevent digging predators and rodents? You might...