Insulation survey and thermal scan

With an insulation survey an adviser walks through the roof and attic and uses a thermal-imaging camera to show where the heat escapes — the roof slope, the attic floor, roof windows and gaps. You literally see which parts of the roof run cold on the outside and where insulating pays off most.

For a survey with thermal scan you pay € 95 to € 250, depending on the size of the home and the depth of the report. You receive an overview of the worthwhile measures in a logical order — attic floor, roof slope or flat roof — and many companies offset the survey fee against a follow-up job; ask about it.

A thermal scan works best in the heating season, when it is warm inside and cold outside — that is when the differences show sharpest on the image. If summer heat is the issue, the adviser assesses the roof for solar gain and ventilation instead.