The insulation levels and U-values are based on the TABULA building typology, the analysis of the EPC database, and the data from 'EPB in cijfers' (ref).
The U-values are translated to a corresponding set of construction layers and materials according to the approach of De Jaeger et al.: starting from an initial construction and initial U-value, the desired U-value is reached by upgrading different layers and materials (ref). As an example for the outer wall, the first upgrade concerns the inner heavy masonry layer. The required thickness of this layer to reach the desired U-value is calculated and compared to the predefined maximal thickness of this layer, determining the final thickness. If the new U-value does not yet satisfy the desired U-value, a non-ventilated air cavity with a maximal thickness of 2.5 cm is added.The thermal resistance is calculated following EN ISO 6946. If the new U-value still does not satisfy the desired U-value, mineral wool is added until the sampled U-value is reached. A similar approach can be used for the ground floor and roof.
| Name | Description |
|---|---|
| LabelA | Library of EPC label A building envelope constructions |
| LabelB | Library of EPC label B building envelope constructions |
| LabelC | Library of EPC label C building envelope constructions |