Firestopping metallic pipe: steel, copper and cast iron through walls and floors
The residence has steel, copper and cast-iron services crossing rated assemblies. One red-marked detail has reached the foreman, and the crew assumes it covers every metal pipe. The coordinator needs to check the actual conditions before that assumption spreads through the floors.
Treat the pipe material as a matching condition, not a minor description. Record the pipe, opening and assembly, then compare the complete proposed system with what is present. Do not extrapolate from a system for steel to copper because both are metal. The released detail must identify the actual permitted configuration and its required materials.
Check the bare pipe before assigning the system
- Identify the service accurately. Record the material, outside dimensions, pipe or tube description and whether a covering is present. Use the service documents and qualified trade confirmation when identification is uncertain. An insulated pipe belongs in the insulated-condition review, rather than being recorded as bare metal beneath an unspecified covering.
- Describe the receiving assembly. Link the wall or floor reference, construction and thickness to the opening number. Measure the opening and actual gap through an approved accessible method. Show an eccentric pipe or irregular edge clearly. A nominal hole diameter alone does not describe the gap around every part of the pipe.
- Compare the entire proposed system. Read permitted penetrants, supports, optional components, packing, fill and application sides together. RectorSeal’s public C-AJ-1087 drawing, for example, names steel in its penetrant item; it does not thereby list copper. It is an illustration of reading limits, not approval for this project.
- Resolve the differences before release. Mark a material, assembly or dimension that does not match. Send the complete condition record through the technical selection and review route. Do not enlarge a hole, substitute packing or add sealant depth as an improvised way to bring it within a different system.
- Keep the selected condition traceable. Put the accepted reference and revision beside the opening record and the crew’s current instruction. Plan the required checks at the stages still visible. Record any later service or opening change as a fresh comparison instead of copying the original accepted status.
Common mistakes
- Calling every metallic service the same pipe type.
- Ignoring insulation because the underlying pipe is steel.
- Using extra sealant as an unreviewed correction for an unmatched condition.
Checklist
Complete the metallic-pipe comparison
- Material and actual dimensions identified.
- Assembly and opening located.
- Gap and any covering recorded.
- Complete proposed system compared.
- Unmatched condition and review owner visible.
Check your understanding
The drawing names steel. Can the crew use it for copper because the proposed fill material is already on site?
