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Message: [QUOTE="sutomcat, post: 3316087, member: 27"] It appears to me as though the spirals that are oriented vertically are consistently thicker than the spirals oriented diagonally. I think the vertical ones primary purpose is bearing weight while the diagonal ones are more for stability. I agree with [USER=5058]NJCuse97[/USER] that the center portion of the new roof, the part made of PTFE, will not be translucent enough to see blue sky though it. There was an article in the PS about this a long time ago. Pete Sala said the original plan was to have the center part of the roof clear, to give the building an open feeling. But he and JW saw some models and realized allowing too much sun in would wreak havoc with TV.. [/QUOTE]