Illustrative scenario — not a completed customer job
High-rise apartment: unit branch or shared stack?
- Location
- Songdo, Yeonsu-gu (illustrative only)
- Problem
- If one sink is slow, the restriction may be inside the unit; if several fixtures or units react together, the shared stack or building line becomes more likely.
- Diagnosis
- A technician would compare affected fixtures, ask whether neighbours have the same symptom, and inspect the accessible branch before deciding whether building management should take over.
- Possible work
- Possible action could be cleaning the unit branch, documenting construction debris, or stopping private work and referring a shared-line issue to management.
- Work time estimate
- Confirmed after on-site inspection; this is separate from the 40–60 minute arrival estimate.
- What the assessment helps clarify
- The purpose is to avoid paying for unit work before a shared or builder-responsibility issue is ruled out.
