| Abstract: | Requirements for inverted roofs with separating layer – notes on the application of EN ISO 6946. This paper explains the application of the EN ISO 6946 standard for different regions in Europe in terms of heat losses through inverted roofs. For determining the heat transfer coefficient of inverted roofs, the October 2003 version of this standard takes into account additional heat loss due to precipitation. This enables additional roof heat losses originating from the flow of warmed precipitation below the thermal insulation to be calculated. The heat loss depends on the quantity of precipitation and on the proportion of water that drains directly between the roof sealing layer and the thermal insulation. The paper explains the application of the standard for different regions in Europe. Supplementary climatic data and boundary conditions for different regions are provided. In addition, the requirements for the separating layer in inverted roofs with separating layer are described. Using the technique described, heat losses due to precipitation can be reduced to such an extent that they are negligible for the purpose of the calculation. |
