Don't ever let temperatures get too hot in the greenhouse or the pvc pipes will wilt like a soft spaghetti noodle then re-harden into whatever shape it wilted into when the temp drops. I used 1/2" and 1 1/2" grey (electricians) pvc for a structure to cover my boat (hasn't seen water in a couple of years). I covered that with a green tarp and the pipes (including the 1 1/2") wilted. The only thing holding up the tarp now are the wood supports I put in to carry the snow load. You can also form the pipes into any shape you like by heating them till they get soft and then bending them. When they cool they will hold the new shape. I use a paint stripping heat gun to heat the area I want to bend.
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