Telling a trade their work has to come out
An empty pail in the level 2 corridor gives it away: liquid waterproofing membrane, from a manufacturer not on the approved submittal. The retreat centre's showers are specified with a sheet membrane, flood-tested before tile. Six showers on this floor are already tiled over the liquid product, and none was tested.

Get a firm decision first, then tell the trade in person and in plain words, with the requirement and the evidence side by side; agree the next steps and confirm them in writing that day. A trade hears "it has to come out" as lost money and a verdict on its work. Softened news starts a stand-off: they argue their product is just as good, or wait for you to back down.
- Stop it spreading: no more of that work goes in until it is settled.
- Assemble the evidence: the specification, the approved submittal, photos, labels and delivery tickets. Check that nobody on your side approved the switch.
- Get the decision in writing from whoever the contract gives it to, often the consultant, and record it in a nonconformance report.
- Meet whoever can commit crews and money — the trade's owner or project manager — with the foreman, at the work.
- Say it in the first sentence, show the evidence, then listen: their reason may matter later.
- Agree the plan, not the bill — removal, protection, re-inspection, the test, dates — and confirm it in writing that day. Cost goes through the subcontract; see back charges.
At shower 203
Common mistakes
- Hinting, so the trade hopes it will pass.
- Telling only the foreman, who can't commit a crew.
- Arguing about who pays before the plan is agreed.
Action list
When work has to come out
- List every place with the same problem
- Photograph the labels beside the approved submittal
- Ask for the consultant's decision in writing today
- Book 30 minutes at the work with the trade's owner
- Write your first sentence: what comes out, and why
Check your understanding
The tile subcontractor's owner offers a ten-year warranty on his membrane if the tile can stay. Can you accept it?



