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Does Open Joist issue floor system designs using a deflection criteria of L/480?

April 26, 2017criteria deflection Designs floor ISSUE joist system

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Does Open Joist issue floor system designs using a deflection criteria of L/480?

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As an open-web floor truss, Open Joist normally issues floor-system designs using the standard floor truss deflection criteria of L/360, because open-web floor joists allow the use of “strongback” bracing (see installation details). Strongback bracing ties a large portion of the floor system together to accomplish “load sharing” and to restrict deflection and bounce. Open Joist provides clear-span tables and uniform load charts based on L/480 deflection criteria. Open Joist floor systems are designed to this criteria when specified (some state building codes and fire assemblies require L/480 criteria).