In cases where glass is over 50% of the wall area, how is the occupant area measured?

When glass constitutes over 50% of the wall area, measuring the occupant area is particularly influenced by the presence of glass as a significant element in the space. The correct choice, which states that the measurement is taken from the inside glass surface to the inside face of the corridor, is appropriate because this approach accurately reflects the usable area that occupants can access and utilize.

This measurement method ensures that the area recognized for occupancy calculations includes the space effectively enclosed by the glass features of the space while excluding the structural elements that demarcate the corridor or transition spaces. By measuring from the inner surface of the glass, one captures the actual volume and floor space where occupants engage with their environment, especially in scenarios where views and natural light are critical components of the design.

Measuring from the outer face of the windows inward, as posited in another option, would not adequately represent the usable area for the occupants and could lead to discrepancies in square footage calculations vital for design compliance and occupancy permits. Similarly, measuring from the glass to all walls is too vague and could result in inconsistency, not providing a standardized approach for all applications.