I am designing a non-insulated building where standing seam metal roofing is specified. Is a structural sheathing substrate (i.e. plywood or cdx) my only option for developing the roof as a diaphragm, or are there standing seam metal roof products rated to provide shear resistance required for diaphragm design? I am aware that the National Frame Builders Association has developed the "1996 Diaphragm Test" which serves to show the acceptable use of light gage metal roofing and siding as lateral force resistance systems for their specific configurations. However, the structure I am designing is not a post frame structure, and I do not want to extrapolate data just to make this work. An alternative option would be to know if there is a steel deck product available that functions as a roofing finish and provides equivalent water intrusion protection as standing seam metal roofing. In this case I could design the diaphragm as per Steel Deck Institute diaphragm design manual.
Any advice is appreciated.
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