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Engineered structural design must comply with the applicable sections of the latest edition of the "Specification for Structural Steel Buildings" of the American Institute of Steel Construction (AISC) and the "Specification for the Design of Cold Formed Steel Structural Members" of the American Iron and Steel Institute (AISI).
AISI Design Guide for Cold-Formed Steel Purlin Roof Framing Systems: The American Iron and Steel Institute (AISI) published the 2009 edition of the Design Guide, based on AISI S100-07, the 2007 edition of the North American Specification for the Design of Cold-Formed Steel Structural Members.