Installation Practices and Procedures Flashcards

A firestop installer discovers that a previously firestopped cable penetration has been disturbed by another trade. The correct response is:

Answer: Document the disturbance, notify the responsible party, and restore to a listed condition

Disturbed firestop must be fully restored to a listed condition, and all parties including the AHJ should be notified as required by project procedures.

Which factor determines whether an intumescent wrap strip must encircle the full circumference of a plastic pipe?

Answer: The pipe's outside diameter relative to the listed requirement

The listed system specifies whether full or partial circumferential coverage is required based on the tested pipe outside diameter and annular space.

When installing firestop in a cold climate where temperatures are near freezing, the installer should:

Answer: Verify that both the substrate and product temperatures are within the manufacturer's application range

Most firestop sealants have a minimum application temperature; installing below this range compromises adhesion and cure, invalidating the installation.

What is the significance of the 'hourly rating' assigned to a through-penetration firestop system?

Answer: It defines how long the system must resist fire, flame, and in some cases heat transfer

The hourly rating indicates the duration the system has been tested to resist fire exposure while maintaining integrity against flame passage and, where T-rated, heat transfer.

A spray-applied firestop material is applied to the correct depth but with visible voids and holidays. The appropriate action is:

Answer: Fill voids with additional material to achieve continuous, void-free coverage

Firestop coatings must be applied in a continuous, void-free layer; voids provide pathways for flame and heat and must be filled to achieve listed performance.

A firestop system listing identifies the maximum 'fill, void, or cavity material' percentage for a cable bundle. Exceeding this fill percentage means:

Answer: The system is outside its tested parameters and is no longer listed

Exceeding the maximum fill percentage changes heat transfer and charring behavior beyond what was tested, rendering the system unlisted for that condition.

Which of the following is a required element of proper firestop documentation at project closeout?

Answer: A record of the listing used, product batch numbers, installer name, and location of each firestop installation

Complete firestop documentation includes the listing reference, product information, installer credentials, and location data needed to verify compliance and support future maintenance.