CFI Building Construction Classifications 3 — Questions and Answers
Question 1: Which of the following is a key fire risk associated with Type V-B (wood frame, unprotected) construction?
- Rapid fire spread through void spaces and early structural collapse (Correct answer)
- Spalling of concrete under heat exposure
- Brittleness of steel connections at high temperatures
- Delamination of masonry veneer
Correct answer: Rapid fire spread through void spaces and early structural collapse
Type V-B wood frame buildings have concealed combustible void spaces that allow rapid fire travel and provide little time before structural failure.
Question 2: Fire-resistive construction (Type I) is MOST likely to be found in which occupancy?
- High-rise office building (Correct answer)
- Single-family residence
- Rural storage barn
- Small retail strip mall
Correct answer: High-rise office building
High-rise buildings require Type I fire-resistive construction to maintain structural integrity long enough for evacuation and firefighting operations.
Question 3: The 'protected' designation (sub-type A) in IBC construction types means that:
- Structural elements have required fire-resistance ratings applied (Correct answer)
- The building is fully sprinklered
- The exterior walls are masonry
- The building has a fire alarm system
Correct answer: Structural elements have required fire-resistance ratings applied
In IBC terminology, 'protected' (A designation) means structural members are encased or coated to achieve required fire-resistance ratings.
Question 4: Which statement about Type IV-HT (heavy timber) construction and fire performance is MOST accurate?
- Large timber members char slowly, maintaining structural integrity longer than light wood frame (Correct answer)
- Massive timber ignites faster than light frame due to greater fuel load
- Heavy timber collapses faster than unprotected steel
- Large timbers produce no char layer and burn completely through quickly
Correct answer: Large timber members char slowly, maintaining structural integrity longer than light wood frame
Large timber members develop a protective char layer that insulates the core, allowing them to retain structural strength longer than light wood framing.
Question 5: An inspector finds a building with noncombustible exterior walls and combustible interior framing. According to IBC, this is classified as:
- Type III (Correct answer)
- Type II
- Type IV
- Type I
Correct answer: Type III
Type III (ordinary) construction is defined by noncombustible or limited-combustible exterior walls with combustible interior structural members.
Question 6: Unprotected steel structural members are MOST hazardous in a fire because they:
- Lose significant strength at temperatures reached in ordinary building fires (Correct answer)
- Conduct electricity and increase electrocution risk
- Are heavier and cause faster floor collapses when cold
- React chemically with water from suppression systems
Correct answer: Lose significant strength at temperatures reached in ordinary building fires
Unprotected steel loses approximately 50% of its yield strength at around 1,100°F, temperatures commonly reached in building fires, leading to connection failure and collapse.
Question 7: When comparing Type I-B and Type II-B construction, the primary difference is:
- Type I-B has higher required fire-resistance ratings on all structural elements (Correct answer)
- Type II-B uses combustible interior materials while Type I-B does not
- Type I-B permits wood framing; Type II-B does not
- They are identical in all fire-resistance requirements
Correct answer: Type I-B has higher required fire-resistance ratings on all structural elements
Both Type I-B and II-B use noncombustible materials, but Type I-B carries significantly higher fire-resistance ratings per IBC Table 601.
CFI Building Construction Classifications 3
Which of the following is a key fire risk associated with Type V-B (wood frame, unprotected) construction?