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Roof Diaphragm Analysis

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How do you analyze a roof diaphragm for an extremely “cut-up” roof system typical for large custom wood-frame residences? Do you ignore the different roof pitches and ridge heights and basically treat it as a flat diaphragm (e.g. floor diaphragm) for the purposes of distributing load to the shear walls? Or does the roof pitch contribute to the diaphragm analysis?

 

Taylor Motley, EIT