It is more difficult than people thought to install supplementary insulation in houses built during the 60's and 70's. Det ar svarare an man tror att tillaggsisolera 60-och 70-talls villora.

Reports on measurements carried out by energy consultants at a national test centre using thermography to determine any improvements in insulation and airtightness through the injection of mineral wool in Dormer houses. Measurements show results which are much better than expected. States costs and payback period of approx 6 years.