Also, how would the calculation be different if the lower portion of the stair were covered by the floor level above? In other words, if the entire stair wasn't open to the upper floor?
In Illustrations 11 and 12 it appears that some of the area of the stair within the unit is counted twice - it's full length is included in the area calculation for the upper level, and the lower part of it's length is included in the area calc for the lower level. Is this correct? It seems like the area should be included in one or the other, but not both.
Under "Measurement Concepts" for Stairs Within Living Units, it says that the area is projected up to the upper floor level, and considered part of the area at that upper level. So in the illustration wouldn't the portion of the stair in the lower level be excluded, and counted only at the upper level?
Can you please clarify? Thank you.