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Hi Delbert, A standing seam has two parts, male and female. Generaly made in two sizes, 1" and 1-1/2". Some older SS were 2" on roofing. The male lip is 7/8" broke at 90º on the flat sheet. Then a female upside down U clip slips over the male 90º and the clip tail is nailed/screwed to the joist. The female SS is a 1" upside U bent to 90º that slips over the male 90º and the holding clip completing the SS. Then a button punch is run along the SS to install a dimple so the seam can not come apart easy. Every other button is on the opposite side, typically about 12" apart. The dimple is a sandwich of three thickness of metal, two of the female U and one of the male. As you can see, water would have to climb the 7/8" 90º in order to leak to the inside of the building plus the standing seam adds great strength to the joint. Adding the SS to a ribbed sheeting thus makes for a very strong roof that will not blow off in the wind. On a copper roof, the SS adds character to the roof line. The only problem with metal roofs is they must be installed in the winter for cold climates, allowing for metal shrinkage, and during the summer heat for hot climates, allowing for metal expansion. The above is a example of a simple standing seam. Over the years there's been various modifications to the simple standing seam design. One not really more effective than the other other than increasing strength with longer seam legs or clips that are machine made, both with the end goal of faster installation. T_Bone
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