Yes, the IBC stands for Internaional Building Code. It is very similiar to the UBC, especially in this area.
e: I understand what you are saying, but please believe me...type of construction governs the entire structure, not just portions of it.
The way TOC works is it mandates the size and height of the building, based on occupancy type. For example, take a skyscraper. These must be built to the most restrictive TOC there is, which is 1A. That is because egressing out of a 100 story building is a difficult thing...that means nothing that can burn can be in the building. The fact floors 1-48 are business, then floor 49 is residential, then floors 50-100 are business again doesn't change the fact that I have a scyscraper.
