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            Structural standing-seam roofs and their components are a clear favorite over other types of roof applications available today. It certainly has major advantages over the through-fastened roof that was once the industry standard. The raised seams of the side-by-side standing seam panels are field formed by a seaming machine and provide for a better roofing system than those that are lapped together and screwed down. Sealing is normally applied at the factory and placed in the seam corrugation. To allow for contraction and expansion, panels are attached to purlins with concealed clips that allow some roof movement.
            There are many designs of clips that can be used in standing-seam roof applications that provide different locations for tab movement. Clips are in a variety of shapes and sizes but they all do the same thing. Attachment is done when the rigid base of the clip is joined with the purlin and the moveable tab is rolled into the seam. All clips are generally pre-set to allow for movement up and down the pitch of the roof. The amount of this movement is determined by slot length and tab size. The articulating clip is accepted as one of the best clips to utilize. Stainless steel clips, in lieu of galvanized clips, are a preferred quality. Pre-punching of all roof panels and purlins from one manufacturer is also a time-saving and cost effective service to insist on.
            There are two main groups of seam configurations for standing-seam roofs. One is trapezoidal and the other is vertical. The trapezoidal seam is more
Widely used because it provides ready concealment for the clip and for its thermal contraction and expansion properties. The widths of the roof panels and corrugation spacing will change depending on the manufacturer. Most plants take into account wind vibration and noise reduction along with proper rigidity factors.
            The corrugated sheets of a standing-seam roof are seamed and have clips attached to allow the separate sheets to become one unit that, as a steel roof membrane, can move with temperature fluctuations. The most roof width that can be designed for is close to two hundred feet. Expansion joints can be employed if additional width is required.
            The length of roof panels in this configuration also changes dependent on manufacturer. Optimum length for the roof panels is less than forty feet because of practical handling issues for shipping and installation. Wider roofs will require panel splicing. End splices can be augmented by clamping plates and pre-punching as opposed to the typical panel to panel stagger. This insures no direct support-to-panel connections that would restrict necessary movement. A lot of problems with steel roofs are with penetrations and end laps so end lap installation must be rigorously supervised.
            Over three quarters of through-the- roof fasteners that are typically used in other roof applications are not needed with a standing-seam roof. Where it is needed is in the through-fastening of the panels at the eave strut, to allow for designed expansion.