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RE: Converting ceiling joist to floor joist.

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I generally agree with your well thought out responses. However, in this instance, while I agree with your interpretation on dimensional requirements, there are now reinforcement requirements in the code (at least for higher seismic regions) that existing footing most likely does not have. Codes generally prohibit imposing new loads on an existing substandard element. In our neck of the wood we require underpinning or new footing if the existing footing does not have any reinforcement.


Ben Yousefi, SE

Santa Monica, CA


From: Nels Roselund [mailto:njineer(--nospam--at)]
Sent: Thursday, September 22, 2005 10:04 AM
To: seaint(--nospam--at)
Subject: RE: Converting ceiling joist to floor joist.


Table 18-1-C of the 1997 UBC prescribes the minimum requirements for number of floors [in addition to a roof] that may be supported on minimum size footings – unusual conditions excepted.  An existing foundation for a house built on a slab on grade supports only a roof – a floor may be added without modifying the foundation.


Nels Roselund, SE

South San Gabriel, CA


From: hadiprawira djohan [mailto:hadiprawira(--nospam--at)]
Sent: Wednesday, September 21, 2005 8:10 PM
To: seaint(--nospam--at)
Subject: Re: Converting ceiling joist to floor joist.


In my case, I have the ex. footing dug and verified the soil. If the footing is inadeaquate, i would suggest helical piles system.

I wonder if anyone else has any other ideas!



Jnapd(--nospam--at) wrote:



How do you upgrade the footings on these structures ??


Joe Venuti
Johnson & Nielsen Associates
Palm Springs, CA

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