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I understand the term Deflection, but what is L/360?

April 26, 2017deflection term understand

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I understand the term Deflection, but what is L/360?

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A. It’s the maximum amount of deflection allowed in your floor. L/360 = unsupported span of joists in inches/360 For example: a floor joist which spans 10 feet with an L/360 limit is designed to deflect no more than 120″/360 = 1/3 inches under live loads. If you have a floor with joists over an unsupported span of 12′ … the floor should not deflect (bend downward) more than 5/16″.