The Terps
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When I did green house I did a wood support frame and used a hole saw on the top of the support board. The point where the pvc is at its tallest I use the hole saw so a 1/4" piece of pvc sticks up but can't be moved at all still. Makes the frame more sturdy does well when there is a support leg every 12ft and makes hanging light fans dehumidifier way easier. Also keeps the pvc from jiggling around. So my pvc was basically only a guide for the tarp and I had a decent load bearing structure.