By Clemens Richarz, Christina Schulz

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Furthermore, the revised EU directive requests that random checks be made of A broader understanding of sustainability A look into the future and the topical analysis of relevant research projects clearly presents that the planned revision of the EnEV for 2012 will not yet complete the energy efficiency assessments for construction work. It could, for example, be fairly simple to determine the resource requirements which are necessary for the production, maintenance and disposal of a building material if the corresponding standardised and therefore generally applicable values were available.

The savings achieved through reduced energy consumption can be calculated for an assumed energy price increase and an assumed life expectancy of the improvement measure by using the following formula: Kn = R Kn R r n Life expectancy of selected building components Component average life expectancy [a] Load-bearing structure concrete masonry (with plaster) timber (cladded) • soft wood • hard wood 120 120 70 100 External wall finish r n -1 r -1 = capital saved = savings during 1st year = price increase of annual savings = duration of savings in years The economic assessment always refers to the year of the investment.

39 Life expectancy of building components, which influence the power economy of a building 31 Principles index of living expenses total expenses for accommodation net rent excluding heating 110 105 100 95 90 85 tancy of the improvement measure so that the installation or component can be replaced at the end of its life cycle. Thus the payback period should never be longer than the life cycle of the improvement measure being financed. The life expectancy is therefore an important aspect when performing comparative investment analyses.

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