If that same joist had gypsum ceiling l 240 the allowable deflection is 0 6.
Floor limit l 360.
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.
See the table below.
They are expressed as a fraction.
Clear span in inches l over a given number.
Please read everything on the attached photo below.
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.
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.
They are expressed as a fraction.
Recent research has shown tile to fail under some conditions when the floor is more rigid than l 360.
Maximum deflection limits are set by building codes.
And since it is small i will leave the source for where it is found here 1.
On center systems these floors often have deflection between the joists exceeding l 360.
The l stands for length.
Note it gives the allowable deflection based on a fractional span quantity so a larger denominator will yield less deflection.