Energy and environmental consequences of an additional wall insulation of a dwelling

Strict economical considerations govern the application of energy conservation measures in buildings. From an environmental perspective, the analysis should include the pollutant effects of manufacturing materials, transport, building and demolition compared to the emissions saved from reduced heating. A Life-Cycle Assessment approach has been used to evaluate an additional external wall insulation measure for a multifamily building. The study shows that the environmental impact of the additional wall insulation has a small pollutant effect compared to the emissions saved. In addition, the profitability is almost equal for insulation thicknesses of between 100 and 170 mm, where the extra building costs for the thicker insulation balance the expected cost savings on fuel purchased in a 40-year perspective. Environmental factors should then favor the thicker insulation.