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Tongue & Groove Diaphragm Retrofit

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UBC does not allow diaphragms of T&G for new construction.  Some areas publish diaphragm values for diagonal T&G (such as City of San Diego) rather than perpinducular to supports. 
What IDS has done in similar situations is count on the plywood only as the wood diaphragm, and T&G acts as solid blocking.  Blocking acts to reduce possible buckling of the plywood diaphragm.
With Joy and Hope,
Bob Freeman, Architect
Structural Designer