I have a reflective, heavy-duty tarp on order. I use this type of tarp on my tree hauling trailer, and usually get a year to a year and a half out of it. I may go with polycarb roofing panels, but they'll jack my cost up to about $1200, total. I used polycarb on a screen house I built, and fifteen years later, in full Austin sun, it's still in fine shape. It's a matter of popping for $600, now, or $100 each time I replace the tarp over the next six to nine years. i'll meditate on this while I erect the pipe structure. Hopefully the fittings will be here soon.
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