Hello, the Regulation does not make such a distinction. In some buildings, we have to make a different floor system on a floor. For example, in the basement, the car park floor is plated without beams and the main building itself becomes another flooring system. In this case, I take into account the request and rules of the main building flooring system. Since the probability of having a different flooring system on each floor in the main building is very low, you will not encounter many different situations apart from the example I wrote above.