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Modern structural standing seam roofs and their characteristics are a clear favorite over other types of roofs available today. It has major advantages over the through-fastened pre-engineered roof that used to be the industry standard. Sealing is seated in the seam furrow and is normally applied at the factory. A seaming device field forms the high seams of the parallel standing-seam panels and makes a superior roofing application counter to those that are fitted together and screwed down. To adjust for expansion and contraction, some roof movement is allowed with panels that are adhered to purlins with concealed clips.