I bought a 22x50 ft roll of greenhouse 6 mil plastic for about 200 plus shipping, from Gothic Arches Greenhouses for my big greenhouse. It works great. The problem with the drop cloth plastic out here is that we get about a month out of it before it starts to break down.
I also made a small hoop house and covered it with the greenhouse plastic and then at night I cover it with a tarp from HD for added protection when it gets down below freezing. Thank goodness that only happens a few nights of the winter here.
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