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American Wood Council

Is roof diaphragm blocking required at the top plate to transfer shear from the diaphragm boundary?

See WFCM section for depth to thickness ratios requiring blocking. Shear transfer through rafter/ceiling joist to top plate connections is assumed to happen without blocking if depth-to-thickness ratios are in accordance with WFCM This is for diaphragm capacities in accordance with WFCM chapter 3 requirements.

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