This report has been prepared for the client named on the cover and may not be relied upon by any other party without the written agreement of Report Kit 360. The issue table above records every revision; the latest row is the current issue.

The school asked for a qualitative thermographic survey of the infant block to locate missing or displaced insulation, thermal bridges and air leakage paths before a planned refurbishment of the external walls and windows. The survey was carried out externally and internally before sunrise on 19 February 2026 with the heating at steady state and a temperature difference of 16 °C.

Conditions were within the limits of BS EN 13187 for a qualitative external survey: overcast sky, no rain for 24 hours, wind 2.5 m/s and no solar loading. The west elevation was imaged last as the sky began to lighten; the images were checked for reflected sky and none was found.

Thermograms were captured from the positions shown on the location key, with the camera set to the emissivity and reflected apparent temperature recorded on each sheet. Images were reviewed by comparing areas of similar construction under the same conditions; apparent anomalies caused by reflections, concealed pipes, cables or heat emitters have been identified and excluded where recognised.

Infrared thermography shows apparent surface temperature patterns at the moment of capture. It does not measure U-values directly, cannot see inside the construction, and depends on the temperature difference, wind, moisture and emissivity at the time. Quantitative values carry a stated uncertainty.

The boiler room and kitchen were excluded at the school's request. The internal face of the hall ceiling was not imaged because of the stage set. The emissivity of the painted render and the plastered internal surfaces was taken as 0.93; the aluminium window frames have a low and uncertain emissivity and apparent temperatures on them are not reported.

External view of the north wall at the ground-floor slab edge. A continuous warm band 150 mm to 200 mm high runs along the junction of the wall and the slab, with the warmest readings below the classroom 3 window. This is a thermal bridge at the uninsulated slab edge of the 1968 construction; the pattern is continuous, follows the slab line and does not correlate with any service run. The 2004 extension to the right shows no such band because its slab edge is insulated.

Include insulation of the slab edge (or an insulated plinth) in the external wall refurbishment of the 1968 block. No action is needed for the 2004 extension.

None observed.

Seven anomalies were recorded: a continuous slab-edge thermal bridge to the 1968 block (moderate), displaced roof insulation above classrooms 2 and 3 seen as cold ceiling patches internally (moderate), air leakage at the window heads of classrooms 1 to 4 (minor), and a thermal bridge at the eaves on the north elevation (minor). No unsafe conditions were found. Priority: reinstate the roof insulation now (low cost), include the slab-edge insulation and window-head sealing in the refurbishment, and repeat the survey after the works under comparable conditions.

The findings describe the condition observed on the inspection date. Buildings and assets change with time, weather and use; if a decision is to be made more than three months after the inspection date we recommend that the relevant areas are re-inspected.