Why standing seam vs. through-fastened panels?
Performance and aesthetics. Single panels in excess of 30’ require the ability to be able to expand and contract, independently of the structure. Temperature fluctuations during the various seasons of the year create thermal movement of the panels and flashings (trim). Standing seam panels are designed to move over concealed clips, allowing non-destructive thermal movement. Since AEP Span markets our panels throughout the entire United States including Alaska and Hawaii, we have to be able to meet the requirements of all geographical conditions. Forces placed upon the screws that penetrate long length through-fastened panels can cause the screw’s compression washer to lose its seal and create a leak. The forces of expansion and contraction can create an elongated hole at the screw location, and jeopardize these metal panels’ weathertightness and attachment. With the increased usage of metal panels on high-slope roofs, rather than just for low-pitched Metal Building roofs, Owners and Ar
