Final answer:
The minimum required height for the lowest portion of the roof deck in a smoke protected assembly seating area with a roof is 15 feet above the highest aisle or aisle accessway.
Step-by-step explanation:
The question asks about the minimal required height for the lowest portion of the roof deck in a smoke protected assembly seating area with a roof. Based on safety protocols and universal design standards in the field of architecture and engineering, the answer to your question is: 'A smoke protected assembly seating area with a roof shall have the lowest portion of the roof deck not less than 15 feet above the highest aisle or aisle accessway.' This is done to ensure that in the event of fire, smoke rises to secure an adequate smoke-free layer for people to evacuate safely and to enhance visibility.
Learn more about Smoke Protected Assembly Area