L 720 Floor Deflection

So if you have a beam 20ft long the allowable deflection limit is 20ftx12in ft 240 1.

L 720 floor deflection.

I am looking for opinions and current practice for design of wood floor framing with stone veneer on top. The l stands for length. And since it is small i will leave the source for where it is found here 1. If that same joist had gypsum ceiling l 240 the allowable deflection is 0 6.

Note it gives the allowable deflection based on a fractional span quantity so a larger denominator will yield less deflection. Point load deflection requirement. The l 360 formula is useful for most ceramic porcelain and hard stone. Please read everything on the attached photo below.

If the span of the joists is 10 feet between supports then the deflection should not be more than 1 3 between the center and the end. Whether you are installing stone or ceramic tile over floors and walls there s one thing to consider. I understand this to be a total load requirement. The differences between l 360 and l 720 for deflection criteria.

Conditions like deflection and vibration can occur in metal plate connected wood. For soft stone tile such as limestone or light marble the l 720 formula applies cutting the maximum allowable deflection in half. For example the allowable deflection of a 12ft span floor joist with plaster l 360 is 0 4 12ft divided by 360. The l 360 standard means that the floor should not deflect more than the span divided by 360.

See the table below. John bridge forum also offers this helpful deflection calculator. Learn more about it here. T technical q a natural stone floors deflection by ryan j.

Given deflection in a short span actually creates a sharper curvature in the floor than the same deflection in a longer span.