Billlmichhiker - there's been a lot of discussion about over vs under. For me, it's seasonal. In the spring/summer/fall there's a chance of rain and one has to be sure, if their line is under, that it doesn't become a freeway for rain droplets to flow under the tarp.And you have some wear on the seam seal. In the winter, around here, you are not worried about the rain. But tree branches can load up with snow. It that case, a line under the tarp offers more support against falling snow.
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