Firefighter Building Construction 1 — Questions and Answers
Question 1: What are the five types of building construction classified by NFPA 220?
- Wood frame, masonry, steel, concrete, and composite
- Type I, Type II, Type III, Type IV, and Type V (Correct answer)
- Residential, commercial, industrial, institutional, and mixed-use
- Ordinary, heavy timber, fire-resistive, non-combustible, and combustible
Correct answer: Type I, Type II, Type III, Type IV, and Type V
NFPA 220 classifies buildings as Type I through Type V based on the fire resistance ratings required of their structural elements.
Question 2: Which type of building construction is considered the most fire-resistive?
- Type II (Non-combustible)
- Type III (Ordinary)
- Type I (Fire-resistive) (Correct answer)
- Type IV (Heavy Timber)
Correct answer: Type I (Fire-resistive)
Type I (Fire-resistive) construction requires all structural components to meet the highest fire-resistance ratings, typically using protected steel or reinforced concrete.
Question 3: What is 'balloon frame' construction?
- A framing method where wall studs run continuously from the foundation to the roof without interruption (Correct answer)
- A steel frame building with inflatable insulation panels between the studs
- A modular construction technique using prefabricated wall panels
- A method where each floor has its own separate wall framing that acts as a fire stop
Correct answer: A framing method where wall studs run continuously from the foundation to the roof without interruption
In balloon frame construction, studs extend from the foundation to the roof without interruption, allowing fire to spread rapidly through wall cavities to upper floors and the attic.
Question 4: Which type of building construction uses heavy timber structural members with minimum dimensions specified by code?
- Type I (Fire-resistive)
- Type II (Non-combustible)
- Type III (Ordinary)
- Type IV (Heavy Timber) (Correct answer)
Correct answer: Type IV (Heavy Timber)
Type IV (Heavy Timber) construction requires large wood members (minimum 8x8 inches for columns) that char slowly rather than failing quickly, historically used in mills and factories.
Question 5: What is the primary hazard of lightweight truss construction during a fire?
- Trusses conduct electricity more readily than standard dimensional lumber
- Lightweight trusses can fail rapidly because the small metal connector plates lose strength quickly under heat (Correct answer)
- Lightweight trusses produce more toxic smoke than heavy timber construction
- They are more difficult to ventilate than platform frame structures
Correct answer: Lightweight trusses can fail rapidly because the small metal connector plates lose strength quickly under heat
Lightweight trusses rely on small metal gusset plates that lose structural strength rapidly when heated, causing early and sudden failure before firefighters may realize the danger.
Question 6: In Type III (ordinary) construction, what are the exterior walls typically made of?
- Steel and glass curtain wall systems
- Non-combustible or limited-combustible materials only, with no masonry requirement
- Non-combustible masonry materials such as brick, stone, or concrete block (Correct answer)
- Heavy timber with fire-resistive coatings applied to all exposed surfaces
Correct answer: Non-combustible masonry materials such as brick, stone, or concrete block
Type III construction (sometimes called 'brick and joist') requires non-combustible exterior walls, typically masonry, while interior structural elements such as floors and roofs may be combustible wood.
Question 7: What term describes a concealed space within a building structure where fire can spread unseen?
- Plenum
- Void space (Correct answer)
- Chase
- Interstitial space
Correct answer: Void space
Void spaces are hidden, hollow areas within floor, wall, or ceiling assemblies where fire can travel undetected, making it difficult for firefighters to locate and suppress the fire.
Firefighter Building Construction 1
What are the five types of building construction classified by NFPA 220?