The standing seam roof panel system is used extensively in residential, commercial and institution type building structures in the USA. The roof system is typically designed for both gravity loading (construction and other live load) and uplift (from wind). Under gravity load, the outstand- ing leg of the connected panels may be subject to distortional buckling- lateral displacement of the unsupported compression flange with rotation about the web-tension flange juncture. In this paper, experimental results from tests on four full-scale panel systems are presented and an analytical procedure is recommended for estimating the distortional buckling capacity of the standing seam roof system.
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