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Re: Site classification - IBC

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It seems that you could look at two ways:

The first is to use site class C assuming or whatever values you can use based on the upper 20' of section, not the 100' that is in the code and have a shallow foundation not bearing on the rock.

The other way is to use site class "A" and design the structure using the upper 20 feet as Jason W. Kilgore suggested and bearing on the rock.


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