Island sink pipe under a new kitchen floor
The property
An older town house extended at the back for a bigger kitchen. Its new island sink is fed by plastic pipe laid in the floor before the stone tiles.
The problem
Grout near the island stayed dark, and the meter kept creeping with every tap shut. The fitter had checked the joints he could reach.
How we found it
Closing the valve where the island pipe leaves the wall stopped the meter, so the buried length was leaking. Listening on the tiles peaked near one corner, and tracer gas rose through the grout there.
The outcome
We marked two tiles and photographed them with the readings. The fitter lifted only those two for the repair; our report went in the owners' file for the building work.