A ceiling stain that came and went with the heating
The property
A detached house on one of the newer commuter estates, with heating pipes under the chipboard floor upstairs and plasterboard ceilings below.
The problem
A lounge ceiling stain grew whenever the heating ran and dried when it was off, and the boiler needed a weekly top-up.
How we found it
Shutting off the upstairs circuit stopped the pressure dropping. Once the heating had run, the thermal camera showed warmth fanning out from a joint above the stain, and tracer gas rose there.
The outcome
We cut out one panel of upstairs flooring at the mark and remade the joint while we were there. The repair was priced apart from the detection.