On a single-family remodel during rough-in, a raceway penetration is made through a rated wall; how should it be closed?
- ABy leaving an air gap
- A matching firestop system
- CWith ordinary painter's caulk
- DWith loose insulation
Why B is correct
Rated assemblies depend on tested penetration details; generic filler does not demonstrate equivalent fire resistance. The best answer is therefore “With an approved firestop system installed for the specific assembly and penetration.” The other choices either address a different system, rely on an unsafe shortcut, or make a conclusion not supported by the stated facts.