FST Building Codes 5 — Questions and Answers
Question 1: Under the IBC, what is the minimum fire-resistance rating required for a corridor serving an occupant load greater than 30 in a Group B occupancy?
- No rating required
- 30-minute rating
- 1-hour rating (Correct answer)
- 2-hour rating
Correct answer: 1-hour rating
IBC Table 1020.1 requires a 1-hour fire-resistance rating for corridors in Group B occupancies when serving an occupant load greater than 30.
Question 2: A fire safety technician encounters a building with an 'accessory occupancy.' Under the IBC, what condition must be met for an area to qualify as an accessory occupancy?
- It must be separated by a 2-hour fire barrier from the main occupancy
- It must not exceed 10% of the story's floor area and remain below MAQ thresholds (Correct answer)
- It must have its own dedicated means of egress independent of the main occupancy
- It must be located only on the ground floor of the building
Correct answer: It must not exceed 10% of the story's floor area and remain below MAQ thresholds
Under IBC Section 508.2, an accessory occupancy must not exceed 10% of the floor area of the story and must not exceed the hazardous material MAQs for the main occupancy.
Question 3: According to NFPA 101, which of the following is NOT a component of an exit?
- Enclosed exit stairway
- Horizontal exit
- Exit passageway
- Exit access corridor (Correct answer)
Correct answer: Exit access corridor
An exit access corridor is part of the exit access — the path to the exit — not the exit itself, which includes stairs, passageways, and horizontal exits.
Question 4: Under the IBC, what is required when a fire-rated wall assembly is penetrated by a cable tray or conduit?
- The penetration must be sealed with a fire-rated through-penetration protection system (Correct answer)
- The penetration is exempt if the conduit is metal
- A minimum 6-inch clearance must be maintained around the penetration
- Only sprinkler piping penetrations require protection
Correct answer: The penetration must be sealed with a fire-rated through-penetration protection system
IBC Section 714 requires that penetrations through fire-rated assemblies be protected with listed through-penetration firestop systems to maintain the assembly's rating.
Question 5: What is the IBC definition of 'fire area' and why is it significant for fire protection system requirements?
- The area within a building enclosed by exterior walls only, used to calculate roof venting
- The aggregate floor area enclosed by fire walls, fire barriers, exterior walls, or horizontal assemblies, used to determine sprinkler requirements (Correct answer)
- The area immediately surrounding a fire-rated door assembly
- The floor area of a single story used exclusively for occupant load calculations
Correct answer: The aggregate floor area enclosed by fire walls, fire barriers, exterior walls, or horizontal assemblies, used to determine sprinkler requirements
A fire area is defined in IBC Section 901.7 as the aggregate floor area enclosed by fire walls, fire barriers, exterior walls, and horizontal assemblies — it is used to trigger automatic sprinkler and other fire protection requirements.
Question 6: Under NFPA 101, what is the required illumination level at the floor level along the path of egress under emergency lighting conditions?
- 0.1 foot-candle
- 1 foot-candle (Correct answer)
- 5 foot-candles
- 10 foot-candles
Correct answer: 1 foot-candle
NFPA 101 Section 7.9 requires that emergency lighting provide a minimum of 1 foot-candle (10.8 lux) measured at the floor level along the egress path.
Question 7: A building constructed before current code adoption is being renovated. Which concept allows the building to comply with less stringent requirements than current code demands?
- Variance
- Special inspection
- Grandfather clause / existing building provisions (Correct answer)
- Performance-based design
Correct answer: Grandfather clause / existing building provisions
Existing building provisions (often called grandfather clauses) in NFPA 101 Chapter 43 and IBC Chapter 34 allow older buildings to meet alternative requirements rather than full current-code compliance during renovation.
FST Building Codes 5
Under the IBC, what is the minimum fire-resistance rating required for a corridor serving an occupant load greater than 30 in a Group B occupancy?