Today I learned that a blocked diaphragm is a flat structural system in which all panel joints are attached to framing or blocking. For example, a section of floor in which blocking is nailed between all joists and all subflooring edges are nailed to those blocking units, creates a blocked diaphragm. A blocked diaphragm can carry much more load than an unblocked diaphragm, and is often used as part of a system to resist lateral loads such as wind or earthquakes.
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