Questions about the roofing material (e.g., What is the snow load of the roofing material you recommend? Should I use clear, solar gray, or another shade? Where can I learn more?):
The roofing panels indicated in the plan are called SunTuf
and are made by Palram Industries. The plan follows the manufacturer's installation guidelines, which you can download here. (This is a general download page, so scroll down for the SunTuf
installation guides. There should be a consumer version and a more detailed "pro-sumer" version.) The panels as attached in this design are rated to support 20-30 lbs. per square foot. As for colors, SunTuf
panels come in different shades. Avoid Clear unless you are locating the coop in full shade. Solar Gray has been great -- it cuts all but 30% of the sunlight. It may look dark in the store, but outside you really see how much light comes through. White works nicely too, diffusing the light even more.
We have not noticed dirt/leaves/fungus accumulating on the gray or white roofs and have not had to wash them. If you have lots of leaf litter or little sunlight, maybe you'll see more of that.