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Has anyone built a greenhouse by using standard roof trusses covered with plastic film. I have access to a number of 24' 7/12 pitch steel trusses that I'd like to put up and then use plastic film as a covering. My concern is that the plastic will bow enough near the eaves that snow will hang and form puddles. We get somewhere between 100' and 200"+ inches of snow in a year. This year nothing but a dusting yet.
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