Installation Practices and Procedures Flashcards
7 cards from real IFC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Installation Practices and Procedures flashcards as text
What is the purpose of a firestop engineering judgment (EJ)?
Answer: To address a unique condition not covered by an existing published listing
An engineering judgment extends firestop expertise to conditions not covered by published listings, using tested data as the basis for the engineered solution.
When two different penetrating items share a single opening (a 'combination penetration'), the installer should:
Answer: Find a listing that specifically addresses that combination of penetrants
Combination penetrations require a listing that specifically covers the combination because the interaction of multiple penetrants affects fire performance.
A firestop sealant manufacturer's data sheet states a 48-hour cure time. At what point is the penetration considered fully protected?
Answer: Only after the full manufacturer-specified cure time has elapsed
Full fire-resistance performance is achieved only after the manufacturer-specified cure time; testing was conducted on fully cured material.
Which condition requires the installer to stop work and seek engineering guidance before continuing firestop installation?
Answer: A substrate material not listed in the system design (e.g., ICF wall instead of CMU)
A substrate not covered by the listing changes the assembly conditions and requires engineering guidance or an alternate listing before installation proceeds.
For a top-of-wall joint (head-of-wall) firestop assembly, what critical installation check ensures system performance?
Answer: Verifying that the compression of the firestop material matches the listed percentage
Head-of-wall firestop systems depend on correct compression of the mineral wool or other material; over- or under-compression changes the tested performance.
In a UL-listed firestop system, the term 'L-rating' refers to:
Answer: The air leakage through the firestop system at ambient and elevated temperatures
The L-rating quantifies air leakage through a firestop system in cubic feet per minute per square foot, measured at both ambient and elevated temperatures.
When applying firestop sealant to a gap between two sections of drywall at a control joint, the installer should NOT:
Answer: Bridge the joint with sealant in a way that prevents the required movement
Bridging the joint rigidly prevents the designed movement, which can tear the sealant during normal building movement and destroy the firestop integrity.