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RE: building codes

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>Who is responsible for the UBC & IBC?


UBC (the Uniform Building Code) was written by the International Conference of Building Officials (ICBO).


IBC (the International Building Code) is written by the successor organization International Code Council (ICC). ICC was formed when ICBO joined together with the Southern Building Code Congress International (SBCCI, which used to write the Southern Building Code (SBC)) and the Building Officials and Code Administrators International (BOCA which used to write the BOCA Code).



>Quick question: what is the difference between UBC & IBC?


There’s no quick answer about the differences between UBC and IBC. The material standards are similar, but evolved over the time between 1997 UBC and 2000 or 2003 IBC. There are many differences -- some obvious, some subtle.



>Where do the AISC, ACI codes and NEHRP & ASCE 7 come into play?


AISC, ACI, and ASCE 7 are some of the reference documents that form the basis for the IBC. They are incorporated in the IBC by reference.



>Is there some kind of a hierarchy among all this?

Starting at the top and working down, a local jurisdiction adopts a model code into law. The model code adopts the reference standards like AISC, ACI, ASCE 7, etc. A reference standard like AISC adopts the more specific reference standards, like AWS, RCSC, ASTM, etc.



Hope this helps.