Underfloor heating added to an older house
The property
An interwar semi with a newer kitchen extension. Radiators heat the old rooms; the extension has underfloor heating in its screed, fed from a cupboard manifold.
The problem
The boiler pressure kept sinking, needing a top-up every few days. No radiator dripped, and the tiled extension floor looked and felt normal.
How we found it
With the manifold shut the gauge held, so the radiators were sound. Opened loop by loop, only one let it fall; warmed, it showed a hot spot on thermal imaging, and tracer gas agreed.
The outcome
The marked tile was photographed with the readings. The owners accepted our separate repair quote, and only the tiles over the leak came up.