Floor Limit L 360

And since it is small i will leave the source for where it is found here 1.

Floor limit l 360. Please read everything on the attached photo below. They are expressed as a fraction. A floor joist appropriately selected to span 10 feet with an l 360 limit will deflect no more than 120 360 1 3 inches under maximum design loads. If that same joist had gypsum ceiling l 240 the allowable deflection is 0 6.

For example the allowable deflection of a 12ft span floor joist with plaster l 360 is 0 4 12ft divided by 360. The l stands for length. When building codes set a deflection limit such as l 360 they do so assuming that framing won t be subject to loads in excess of a certain amount. They are expressed as a fraction.

Clear span in inches l over a given number. For example while joist manufacturers regularly meet the standard l 360 criteria for code construction with 24 o c. On center systems these floors often have deflection between the joists exceeding l 360. So if you have a beam 20ft long the allowable deflection limit is 20ftx12in ft 240 1.

Clear span in inches l over a given number. A floor joist appropriately selected to span 10 feet with an l 360 limit will deflect no more than 120 360 1 3 inches under maximum design loads. Note it gives the allowable deflection based on a fractional span quantity so a larger denominator will yield less deflection. See the table below.