The strength of the plastic is actually the problem. It's strong enough to pull down the structure when it collapses.
The pics below are how I know that. These pics are from three years ago. I put everything back together with the old materials. I'm a little lumpy now, but the collapse cost me about thirty bucks. Now I know to take the plastic off in the winter. This was a freak storm, ten inches of mostly ice pellets. My Clearspan building survived it; my top rail high tunnel did not.
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