Commerical Wood deck framing

[AWMarina1]

I am repairing 3 small wood framed landings on a restaurant property and have encountered an odd request from the building official. These landings are about 7 feet wide, 5 feet deep, and overhang the existing foundation by 23 inches. They are 16 inches above grade. We planned to sister new 2x10s onto the existing and simply reframe the overhang with new materials. The BO stated that we need to have a foundation under the outer edge to achieve 100 psf. He indicated we could do this with concrete or helical piles.

This seems like overkill. There are a significant amount of underground utilities and I'm looking for the safest, simplest solution to satisfy the code/BO.

Any suggestions would be appreciated.

 

[Eng16080]

If the new joists and their connection to the existing joists are adequate to cantilever 23" and the existing foundation is also adequate to support the resulting load, then I see no logical reason why a support would be needed at the end.

And at this point, if you were to add the additional support at the overhang, it's likely that very little load would even end up there since the new foundation elements would likely settle a bit, while the existing foundation won't.

Unless I'm missing something here, the BO's request makes little sense. I would certainly ask the BO what their reasoning is.

 

[XR250]

If the new joists and their connection to the existing joists are adequate to cantilever 23" and the existing foundation is also adequate to support the resulting load, then I see no logical reason why a support would be needed at the end.

I believe the issue is that the OP is not a structural engineer and cannot prove that the proposed framing is adequate.
The code probably does not address cantilevers with 100 PSF. I would find a local structural engineer to sign off on this.
Should be easy to make work. I mean the moment is only 200 foot pounds and I can't imagine that deflection is an issue.

 

[LittleInch]

That's not sistering though for the overhang.

Decks have a poor reputation for failure, especially at edges where people tend to stand, lean on them etc.

Are they all resting on that little bit of 2x2?
Did the old deck foundations sink a bit?

Is the double beam end nailed into the cantilever. Pretty sure that's not a great technique and I assume there is some bending on that with a guard rail?

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