Cooptown Lady
Chirping
I put dark gray poly panels on the roof of the 8 x 8 run. The entire roof is covered in panels which is great for shade (AZ heat) and predator protection (hawks).You have many plans ahead of you. I am still trying to visualize all that you described.
If I was in the backyard with you next to me, I would be able to offer much more, since a back and forth conversation is priceless, in conveying a message.
Let me offer some advice about what I do know. The Polycarbonate panels are good and I have them on the back of my garage as a overhead weather shield. Mine are a blue clear color, and it seem not available. Clear and smoke color are. Had mine up for over 20 years, and served me well. I have my panels supported every 2 feet, since I do encounter a significant snow load.
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There are also same size panels available in Fiberglass. which is stronger. Not available as commonly as the polycarbonate, but If you search,,,,,,,,, sure you can find some.
In my area, Menards carries them. I did not check other stores, but Home Depot does not have them listed .
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The panels are comparably priced.
This is my input to your many questions.
WISHING YOU BEST,,,,,,,,,,,,,,,,,,,,,,
At first I thought a gray almost black roof might absorb heat and add heat to the run. Just the opposite! I read that the poly panels block UV which causes heat.
I love these panels! The run is so shady. BTW, if the roof is high enough (mine is only 5 ft.) the chickens get plenty of sun from the sides.