When they manufacture greenhouse plastics, it's done in rolls that are, I'd guess 10-12' or so wide. Then to make wider widths, they heat-seam it together. My 20' plastic has two seams going down it longways, one on each side. That's the weak part of the plastic. It comes apart at the seams first, long before wearing any other place. I could probably just run 2x4s down those seams to hold them together and get another few years out of my plastic.
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