Leak detection in Denham: why can moving a rug change a thermal floor image?

Preserve the room layout before moving anything

Photograph rugs, furniture, sunlight and heating controls in their normal positions. Mark the suspected floor area against fixed walls. If a covering must be moved for professional inspection, record the time and original footprint so its thermal effect remains part of the interpretation.

Do not lift flooring, roll back fixed carpet or place heaters on the area. Underfloor pipes, cables and adhesives may be present. A safe room plan can show the relationship without disturbing concealed services.

Let the floor reach a known operating state

Note when heating started, which zone called and the floor construction if known. A thermal image taken immediately after uncovering compares different recent histories, not simply wet and dry material. Ask the investigator how long the surface needs to stabilise.

Record sunlight through windows, open doors and powered equipment. These can create edges and reflections. Thermal imaging shows surface temperature; moisture, pipe location and leakage require other evidence.

Look for agreement with system evidence

Compare the image with comparable cold pressure readings, zone behaviour and any moisture observations. A known pipe route that warms normally may explain a line without indicating loss. Conversely, a pressure trend needs a defined heating-circuit boundary before it is linked to the floor.

Professional moisture or pressure checks should use reference points and written conditions. Ask which alternative—insulation, covering, pipe heat or retained moisture—each finding makes more or less likely. Avoid selecting the brightest colour as an access point by itself.

Restore conditions for the closing check

If a defect is confirmed and repaired, photograph the exposed route before closure. Repeat the relevant system test, then let the finish recover under professional advice. A repaired pipe beneath damp screed does not make the surface immediately ready for reinstatement.

Return coverings only when safe and appropriate, noting that they will alter temperature again. Keep post-repair pressure and moisture evidence separate from the thermal appearance. Gas-boiler work remains with a Gas Safe registered engineer.

Record the camera date, palette and temperature range where the professional provides them, because colours cannot be compared reliably across differently configured images. The useful conclusion is the interpreted pattern alongside pressure and moisture evidence, not whether a later picture looks visually warmer or cooler.