Building Construction & Fire Behavior Flashcards

A fire inspector observes that a building's fire-rated corridor wall does not extend to the deck above, stopping instead at the suspended ceiling. What is the primary code concern?

Answer: Fire and smoke can bypass the rated wall through the ceiling plenum, defeating the compartmentalization

When fire-rated partitions do not extend to the structural deck, fire and smoke can travel freely through the ceiling plenum and defeat the intended compartmentalization.

Which type of roof construction presents the most significant collapse hazard to firefighters during a structural fire because of its flat geometry and single-layer construction?

Answer: Bowstring truss roof

Bowstring truss roofs span large areas with minimal structural redundancy; fire damage to any truss member can cause sudden, catastrophic collapse of large roof sections without warning.

What does 'fire resistance rating' measure for a building assembly?

Answer: The duration in hours that the assembly resists fire exposure under standardized test conditions

Fire resistance rating is the time period, expressed in hours, that an assembly (wall, floor, column, etc.) resists fire exposure as measured by the ASTM E119 or equivalent standardized test.

In fire dynamics, the 'ceiling jet' refers to:

Answer: The horizontal flow of hot gases beneath the ceiling driven by a fire plume

A ceiling jet is the radially spreading, thin layer of hot combustion gases that flows outward beneath the ceiling after the fire plume strikes the ceiling surface.

Which NFPA standard specifically addresses the fire protection requirements related to different construction types and occupancy classifications?

Answer: NFPA 220 (Types of Building Construction)

NFPA 220 defines the five types of building construction (Types I through V) based on the combustibility and fire resistance of structural and non-structural elements.

What is the main fire hazard introduced by a large open atrium in a multi-story building?

Answer: An atrium acts as a vertical chimney, accelerating smoke and hot gas spread to upper floors

An atrium creates a chimney effect — hot smoke and gases rise rapidly through the vertical opening, potentially filling upper floors with smoke and hazardous conditions far from the fire origin.

During an inspection of a newly constructed building, you find that exterior insulation and finish system (EIFS) cladding has been installed. What fire concern should you evaluate?

Answer: Combustible foam insulation in EIFS can contribute to exterior fire spread, especially to upper floors

EIFS systems often contain combustible expanded polystyrene insulation that can burn and contribute to rapid exterior flame spread, potentially bypassing interior fire-resistance measures.