Which statement about structural fire loading and Type III construction is true?

Which statement about structural fire loading and Type III construction is true?

• A. 1 and 2 are true; 3 is false
• B. All are true
• C. 1 is true; 2 and 3 are false
• D. 1 is false, 2 and 3 are true

Answer: (A)

In Type III construction, interior framing is typically wood, while exterior walls are noncombustible. That combination leads to a substantial structural fire loading inside the building because the interior members and contents can contribute a lot of fuel to the fire. The noncombustible exterior walls do offer some resistance and can slow flame spread from outside, but they don’t eliminate the danger inside; once the interior fire grows, it can compromise the structure despite the exterior walls. So, the statements that interior wood framing contributes to higher structural fire loading and that exterior noncombustible walls influence fire behavior without guaranteeing interior safety are correct; the statement that downplays interior fire loading or overstates protection by exterior walls is incorrect. That aligns with choosing the option that marks the first two as true and the third as false.

In Type III construction, interior framing is typically wood, while exterior walls are noncombustible. That combination leads to a substantial structural fire loading inside the building because the interior members and contents can contribute a lot of fuel to the fire. The noncombustible exterior walls do offer some resistance and can slow flame spread from outside, but they don’t eliminate the danger inside; once the interior fire grows, it can compromise the structure despite the exterior walls.

So, the statements that interior wood framing contributes to higher structural fire loading and that exterior noncombustible walls influence fire behavior without guaranteeing interior safety are correct; the statement that downplays interior fire loading or overstates protection by exterior walls is incorrect. That aligns with choosing the option that marks the first two as true and the third as false.