New Required Egress Capacity Based on Occupant Load Image Added to the Inspection Gallery

Is there a Building Code reference to accompany this graphic?

IBC Stair Width Calculation - Upside Innovations.

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Thanks for the reference Marcel. It is far more complicated than the graphic suggests and that is why it should reference code. It would also be useful to state that the minimum stairway width is 36 inches.

Actually Bob, all the commercial buildings I built the stairways were always a minimum of 44" in width.