How to Hand Off a Problem You Found in Another Trade's System

Why this matters

Every trade eventually finds something wrong that is not theirs: a leaking drain in the crawlspace, a scorched vent pipe, a loose solar conduit, a cracked gas connector. What happens next decides three things: whether the problem gets fixed before it gets worse, whether the customer understands it well enough to act, and whether your shop gets blamed for it later. A good handoff takes ten minutes and leaves a record. A bad one is a passing comment the customer forgets by dinner, and six months later "your tech was down there and never said anything" is the only version anyone remembers.

The steps below run in order, and one case runs through all of them: an HVAC tech in a crawlspace who finds a leaking sewer drain. For the phone call itself, see related: Describing a Problem in Another Trade's Own Words. For deciding whether the system is yours at all, see related: The Five Questions to Ask About a System That Is Not Yours.

The case. An HVAC tech is in a crawlspace replacing a section of flex duct under a bathroom. About 3 ft from the duct, the cast-iron drain line under the bathroom has a joint that is dripping. The soil under it is wet and dark over an area about 2 ft across, the batt insulation in the floor above is sagging and wet, and there is a sewage smell. The homeowner is upstairs.

Step 1: Stop the work that is near it

Do: stop whatever you were doing within reach of the problem, and back away from it far enough to think. Check whether anything you are doing could make it worse: running water, vibration, a cord lying in the wet, your own body in the hazard.

Why first: you found it because you were working near it, which means your work may be part of what happens to it next. A tech who keeps going "just to finish the duct" can end up kneeling in sewage, dragging a work light cord through standing water, or bumping a joint that was holding by habit.

What breaks if you skip it: you turn a found problem into a problem you are part of.

In the case: the tech stops cutting the duct, moves the work light so its cord is out of the wet soil, and moves back toward the access hatch. Sewage-wet soil is a contact and ingestion hazard: the tech is already in nitrile gloves and coveralls, and does not kneel in the wet area or touch the face before washing. The smell is noticeable but not strong; if it were strong enough to sting the eyes or catch the throat, the tech would leave the crawlspace entirely before anything else, because sewer gas builds up in a closed crawl.

Step 2: Make safe only within your own scope

Do: take only the actions that are yours, or that any homeowner could take, to keep the problem from getting worse. Never repair, adjust, patch, tape, re-tighten or "temporarily" fix the other trade's system.

Within scope, generally: stopping your own work; keeping people and pets away; asking the customer not to use a fixture, appliance or circuit; turning off your own equipment; and the emergency actions every trade owes (leaving and calling 911 or the utility for gas, CO, fire or energized water).

Outside scope: wrapping a leaking joint, tightening a gas fitting, resetting the other trade's breaker or controller, moving their equipment out of your way, opening their sealed covers.

Why the line sits there: a repair by the wrong trade hides the problem from the right one, takes on liability for a system you are not licensed or insured for, and is almost never as durable as it looks. A wrapped drain joint stops dripping for a month while the soil under it stays wet.

In the case: the tech's scope here is the homeowner's use of the bathroom. Every flush and shower sends sewage through that joint. The tech does nothing to the pipe.

Step 3: Photograph it, wide and close

Do: take at least three photos from where you safely are: one wide shot that shows where the problem is relative to something fixed (the access hatch, a pier, the furnace), one medium shot of the component, and one close shot of the defect itself. Add a tape measure or a hand in the close shot for scale. Do not move anything to get a better photo.

Why: the owning trade will decide how urgent it is, what to bring and how long to book from your photos. The wide shot is the one people skip and the one the next tech needs, because "under the bathroom" covers a lot of crawlspace.

What breaks if you skip it: the customer's description to the plumber is "the HVAC guy said there's a leak somewhere", and the plumber books an hour to find it instead of half an hour to fix it.

In the case: a wide shot from the hatch with the leak in frame, a medium shot of the joint with the wet soil, a close shot of the drip with a tape held next to the joint showing it sits 32 in from the nearest pier.

Step 4: Tell the customer, in plain words, before you leave the house

Do: tell the customer face to face (or by phone if they are away) what you found, what it means for them right now, what you need them to do or not do, and who to call. Use the words they will use when they call. Skip your opinion of who caused it.

Why: the customer is the one who calls the other trade, decides how fast, and pays for it. A note in a crawlspace or a line on an invoice is not the customer being told.

What breaks if you skip it: the problem waits until it becomes obvious, and when it does, the first question is whether anyone knew.

In the case: "While I was under the bathroom I found the sewer drain from that bathroom leaking at a joint. The ground under it is wet and the insulation above is soaked. Until a plumber looks at it, please don't use that bathroom: no flushing, no shower, no sink. I'll leave you photos and a note with what to tell them. You'll want a plumber, not us." The homeowner repeats it back: don't use the hall bathroom, call a plumber. That repeat-back is the check that the message landed.

Step 5: Write the handoff note

Do: leave a short written note for the customer to keep and to read to, or forward to, the owning trade. It carries the five facts from the call (what, where, since when, what changed, what you did) plus what you asked the customer to do and your contact details for questions.

Why: memory degrades by the evening; the note does not. The owning trade reads it on arrival and starts where you left off.

What breaks if you skip it: the plumber arrives, hears a paraphrase, and spends the first half hour rediscovering what you already knew.

In the case:

HANDOFF NOTE - FOUND DURING HVAC WORK
Date/time: Tue, 10:40
Found by:  HVAC tech, service ticket on file
System:    Sewer drain (plumbing), not ours

WHAT:   Cast-iron drain joint dripping, sewage smell
WHERE:  Crawlspace under hall bathroom, 32 in from
        nearest pier, about 3 ft from the supply duct
SINCE:  Unknown. Soil wet across about 2 ft, floor
        insulation above sagging and wet
CHANGE: None known (ask homeowner)
DID:    Nothing to the pipe. Stopped our duct work at
        that spot. Photos taken (3), sent to homeowner
ASKED:  Homeowner not to use hall bathroom until a
        plumber has looked at it
CALL:   A licensed plumber. Wet insulation and soil
        cleanup after the repair
QUESTIONS: call our office, ticket number on invoice

Step 6: Say who to call, and stop there

Do: name the trade, not a person or a company, unless the customer asks or the system carries another company's service sticker (then name that company too). If you genuinely do not know which trade owns it, say so and say how to find out; see related: How to Tell Which Trade Owns a Pipe, Wire or Duct You Found.

Why: "call a licensed plumber" is information. "Call my cousin" is a referral the customer may feel pushed into, and you own its outcome.

What breaks if you skip it: customers call the trade they already know, which is yours, and you get the call back asking you to fix a drain.

In the case: "a licensed plumber" on the note, with the added line that the soil and insulation cleanup comes after the repair, so the customer does not hire a cleaner first and pay twice.

Step 7: Record it on your own ticket

Do: on your shop's ticket for the job, record what you found, the photos, what you told the customer and when, that they repeated it back, what you asked them to do, and that you left the note. Note what you did to finish your own work around it.

Why: this is the record that answers "did anybody tell us?" six months from now, from the customer, their insurer or the owning trade. It is also how your own office knows to ask about it at the next visit.

What breaks if you skip it: the only record of the handoff is the customer's memory and the tech's, and one of them changes jobs.

In the case: the ticket gets the three photos attached, a note reading "Found drain leak under hall bath, plumbing. Told homeowner 10:45, repeated back. Asked not to use hall bath. Handoff note left. Duct section finished from the hatch side, clear of the wet area." The tech also flags the job for a follow-up question at the next maintenance visit: did the plumber come?

How the case would change

• The problem is a hazard right now (a gas smell, a CO alarm, water on an energized panel). Step 2 becomes the emergency action and the 911 or utility call, and steps 3 to 7 happen afterward, from outside. Photos are never worth staying for.
• The customer is not home. Step 4 happens by phone before you leave, not by a note on the door. If you cannot reach them and the problem is getting worse while you watch, call your own office and let them keep trying.
• The problem is in your own trade after all (the "drain" turns out to be your condensate line). It stops being a handoff and becomes your repair or a quote. The record is the same.
• The customer says "just fix it while you're here". Decline anything outside your license and scope, say why in one sentence ("it's a plumbing repair and we're not plumbers"), and finish the handoff anyway.

How to know the handoff worked

The customer can say back, without the note, what you found, what not to use, and which trade to call. The note is in their hands. The photos are in their phone and on your ticket. Your ticket says when you told them. If any of those four is missing, the handoff is not finished.

References

• See related: Describing a Problem in Another Trade's Own Words
• See related: The Five Questions to Ask About a System That Is Not Yours
• See related: How to Tell Which Trade Owns a Pipe, Wire or Duct You Found
• See related: Sump Pumps and Sewage Ejectors for Trades in the Basement