IFC Firestop Systems and Materials 2

Question 1

Which UL system designation prefix specifically identifies firestop systems tested for use in concrete floor assemblies?

Accepted Answer

C-AJ series

Answer

The C-AJ series in the UL Fire Resistance Directory covers firestop systems designed for concrete floor assemblies.

Question 2

What is the primary purpose of an intumescent firestop collar installed around a plastic pipe penetration?

Accepted Answer

To expand under heat and crush the melting pipe shut, blocking fire passage

Answer

Intumescent collars swell dramatically when heated, compressing the collapsing plastic pipe and sealing the opening against fire and smoke.

Question 3

According to ASTM E814, what does the 'T' rating of a firestop system measure?

Accepted Answer

Time before combustible materials on the unexposed side reach 325°F above ambient

Answer

The T (temperature) rating is the time until the unexposed surface temperature rises 325°F above the starting ambient temperature at the penetration.

Question 4

A firestop mortar is most appropriately used to seal which type of penetration?

Accepted Answer

Large bundled cable trays or multiple conduit groupings

Answer

Firestop mortars are ideally suited for large, irregular openings such as those containing cable trays or multiple grouped conduits because the material can be poured or packed to fill complex voids.

Question 5

What condition makes a firestop system listing inapplicable for a specific field installation?

Accepted Answer

The pipe material is the same but the wall thickness exceeds the listed range

Answer

All installation parameters—including wall thickness of the penetrating item—must fall within the listing's tested range; exceeding any limit voids the listing.

(IFC) International Firestop Council Premier Certificate Practice Test

(IFC) International Firestop Council Premier Certificate Practice Test

IFC Firestop Systems and Materials 2