FST Building Codes 2 — Questions and Answers
Question 1: Under the IBC, what is the minimum fire-resistance rating required for exterior walls of a Type I-A construction building when the fire separation distance is less than 5 feet?
- 1 hour
- 2 hours
- 3 hours (Correct answer)
- 4 hours
Correct answer: 3 hours
IBC Table 705.5 requires a 3-hour fire-resistance rating for exterior walls with a fire separation distance of less than 5 feet in Type I-A construction.
Question 2: Which IBC occupancy classification applies to a building used for the display and sale of combustible goods open to the public?
- Assembly (Group A)
- Business (Group B)
- Mercantile (Group M) (Correct answer)
- Storage (Group S)
Correct answer: Mercantile (Group M)
Group M (Mercantile) covers buildings used for the display and sale of merchandise open to the public, such as retail stores.
Question 3: According to NFPA 101, what is the maximum allowable dead-end corridor length in a new business occupancy?
- 20 feet
- 50 feet (Correct answer)
- 100 feet
- 150 feet
Correct answer: 50 feet
NFPA 101 limits dead-end corridors in new business occupancies to 50 feet to ensure occupants are not trapped.
Question 4: A building has a sprinkler system installed throughout in accordance with NFPA 13. Under IBC provisions, which benefit does this typically provide?
- Elimination of all fire-resistance rating requirements
- Allowance for increased building area and height (Correct answer)
- Removal of the need for exit signs
- Exemption from occupancy load calculations
Correct answer: Allowance for increased building area and height
IBC Section 504 and 506 allow increases in allowable building height and area when an NFPA 13 sprinkler system is installed throughout.
Question 5: What term describes the vertical opening in a building that connects two or more stories and must be enclosed with fire-rated construction under the IBC?
- Atrium
- Shaft enclosure (Correct answer)
- Interstitial space
- Plenum
Correct answer: Shaft enclosure
A shaft enclosure is a fire-rated enclosure surrounding vertical openings such as stairways, elevators, and mechanical chases connecting two or more stories.
Question 6: Under the IBC, an occupant load of 500 or more in a Group A occupancy requires how many means of egress?
- 2
- 3
- 4 (Correct answer)
- 6
Correct answer: 4
IBC Table 1006.3.4 requires a minimum of 4 means of egress when the occupant load reaches 500 or more in Group A occupancies.
Question 7: Which building code provision governs the required fire-resistance rating for horizontal assemblies (floors/ceilings) separating occupancies?
- Occupancy separation requirements (Correct answer)
- Exterior wall provisions
- Corridor protection standards
- Roof assembly regulations
Correct answer: Occupancy separation requirements
IBC Section 508 establishes occupancy separation requirements, including the fire-resistance ratings for horizontal assemblies separating mixed occupancies.
FST Building Codes 2
Under the IBC, what is the minimum fire-resistance rating required for exterior walls of a Type I-A construction building when the fire separation distance is less than 5 feet?