My run isn't a hoop coop thing, but the shade cloth that I have covering over the top of it down where I keep the misters at during the summer is still up there 6 years later. I'm glad that I didn't put a tarp up. The shade cloth does tone down the suns rays, but also let's air flow though it.The shredded tarps may have saved the frame of the coop (gave their lives so to speak). If you do metal or anything stronger than tarp, the frame might not be able to take the force of the wind. Twisted frame, or blow-over of the structure. I forget--is this a flat top, or does it have a peak? This is where I love the hoop coop idea, the roundness means you can use shade cloth and keep it bone dry inside, and the shade cloth still allows air circulation that helps to avoid the shredding that tarps suffer.