BU 20-02 provides notice to design professionals, building manufacturers, and DSA staff on the maximum spacing requirements for cold-formed steel (CFS) joists or rafters for diaphragms sheathed with wood structural panels for projects submitted under the 2016 or 2019 California Building Code (CBC). DSA is requiring compliance with American Iron and Steel Institute (AISI) S400 and AISI S240 that limit the maximum CFS joist or rafter spacing to 24 inches on center, as stated in this bulletin.

Please direct any questions to Ryan Turner, District Structural Engineer, Code and Standards Unit, at ryan.turner@dgs.ca.gov. For project specific questions, please contact the applicable regional office directly as described in the bulletin.

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