Using Cantilevers

Q: I am building an addition on the back of my home with a walk out deck. What are the considerations when working with cantilever joists?

A: You have to be concerned about floor system vibration due to floor joist movement and deformation. Having cantilever joists can create a lot of vibration, not only in the cantilever portion of the room but throughout the addition and depending on how the addition I tied into the rest of the joist system, you could create vibration throughout the entire home.

There are different good practice construction methods if using solid lumber versus I-Joists.

Additional information on cantilever construction

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