A plumber finds that a sanitary pipe sleeve through a rated wall was omitted before the wall was closed. The crew proposes core drilling and leaving the annular space open. What should the superintendent require?
Correct Answer
D) Coordinate an approved penetration and firestopping detail before the pipe is installed
Penetrations through rated assemblies need approved openings and firestopping systems; leaving the annular space open can compromise the rating. Other choices ignore the rated assembly or use unapproved stuffing.
Why This Is the Correct Answer
Penetrations through rated assemblies need approved openings and firestopping systems; leaving the annular space open can compromise the rating. Other choices ignore the rated assembly or use unapproved stuffing.
Why the Other Options Are Wrong
Option A: Core drill and leave the gap because the pipe is noncombustible
Choice A (Core drill and leave the gap because the pipe is noncombustible) is rejected because the option shifts to a different trade task; the tested Sleeve coordination function or field correction is Coordinate an approved penetration and firestopping detail before the pipe is installed.
Option B: The superintendent should cut the pipe smaller to avoid firestopping
In mechanical and plumbing, Cut the pipe smaller to avoid firestopping is the wrong selection for Sleeve coordination: it describes work from another assembly, while the Sleeve coordination item is asking for Coordinate an approved penetration and firestopping detail before the pipe is installed.
Option C: Base the sleeve coordination response on pack the gap with scrap insulation
The trap in C is Pack the gap with scrap insulation only. That selection is wrong because the option delays or omits the controlling step.
Memory Technique
Tag the scene with sleeve coordination: wrong actor or wrong timing means the fix is not Coordinate an approved penetration and firestopping detail before the pipe is installed.
Reference Hint
Open Principles and Practices of Commercial Construction, 11th Ed., 2024; use the index entry or section for "MEP penetrations through rated assemblies" to confirm that Penetrations through rated assemblies need approved openings and firestopping systems; leaving the annular space open can compromise the rating.
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