IFC Codes, Standards, and Regulations 3 — Questions and Answers
Question 1: What does the 'L-rating' in a firestop listing indicate?
- Load-bearing capacity of the firestop material
- Air leakage through the firestop assembly at ambient and elevated temperatures (Correct answer)
- Length of the firestop product tested
- Luminescence level under emergency lighting conditions
Correct answer: Air leakage through the firestop assembly at ambient and elevated temperatures
The L-rating measures the amount of air that leaks through a firestop assembly at both ambient (40°F/75°F) and elevated (400°F) temperatures, expressed in CFM per square foot.
Question 2: Under NFPA 13, how must firestop systems be coordinated with automatic fire sprinkler installations?
- Firestop materials must be installed before sprinkler pipes
- Firestop systems must not compromise the sprinkler pipe's ability to move or expand (Correct answer)
- Sprinkler pipes are exempt from all firestopping requirements
- Firestop collars must be placed within 6 inches of every sprinkler head
Correct answer: Firestop systems must not compromise the sprinkler pipe's ability to move or expand
NFPA 13 requires that firestop systems allow for the thermal expansion and movement of sprinkler piping so the system remains functional.
Question 3: Which IBC chapter primarily governs fire and smoke protection features including firestopping through-penetrations?
- Chapter 5 – General Building Heights and Areas
- Chapter 7 – Fire and Smoke Protection Features (Correct answer)
- Chapter 9 – Fire Protection Systems
- Chapter 12 – Interior Environment
Correct answer: Chapter 7 – Fire and Smoke Protection Features
IBC Chapter 7 covers fire-resistance-rated construction, including requirements for through-penetration firestop systems and fire-resistant joint systems.
Question 4: A firestop system installed in a horizontal fire-rated assembly must have an F-rating and, if required, a T-rating. When is a T-rating NOT required in a floor assembly?
- When the penetrant is metallic
- When the floor is less than 6 inches thick
- When the space below the floor is not a separate occupancy and not a public corridor (Correct answer)
- T-ratings are always required in floor assemblies
Correct answer: When the space below the floor is not a separate occupancy and not a public corridor
IBC exempts the T-rating requirement when the penetration is not through a floor that separates occupancies or is adjacent to a public corridor, reducing the risk of injury from radiated heat.
Question 5: ASTM E2307 is specifically used to evaluate:
- Linear joint systems in curtain wall assemblies (Correct answer)
- Firestop systems for combustible penetrants
- Intumescent wrap strips for plastic pipe
- Smoke damper performance in HVAC ducts
Correct answer: Linear joint systems in curtain wall assemblies
ASTM E2307 tests the fire-resistive performance of perimeter fire containment systems, particularly linear joints at the intersection of exterior curtain walls and floor slabs.
Question 6: Per the IBC, 'listed and labeled' firestop systems means they have been:
- Approved in writing by the building owner
- Evaluated by an approved testing laboratory and marked accordingly (Correct answer)
- Submitted to the local fire marshal for review
- Reviewed by a licensed structural engineer
Correct answer: Evaluated by an approved testing laboratory and marked accordingly
Listed and labeled products have been tested and certified by an approved third-party testing laboratory such as UL or Intertek, and bear a label indicating compliance.
Question 7: Which standard addresses the testing of smoke containment systems (smoke barriers) including firestop requirements at penetrations?
- ASTM E119
- UL 2079
- NFPA 105 (Correct answer)
- IBC Section 706
Correct answer: NFPA 105
NFPA 105 (Standard for Smoke Door Assemblies and Other Opening Protectives) covers smoke barrier requirements including penetration sealing for smoke containment.
IFC Codes, Standards, and Regulations 3
What does the 'L-rating' in a firestop listing indicate?