My first greenhouse had roll-up sides. I agree they are very important. I never did get the bar to not sag, though. I don't know what I was doing wrong. I went without the bar and rolling part for the high tunnel. I just hold the plastic up with rope or bungee cords when I want them up. Sand bags hold them down when they are down. It helps to weave batten cord through the space so the wind can't push the plastic out from the sand bags.
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