Glazier diagram

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Glaser diagram without condensation

The Glaser diagram is used to assess the loss of condensation in components. It serves as an alternative to the calculation using the Glaser method . To create the Glaser diagram, the component is inserted into a Cartesian axis system .

The temperature curve in the component to be examined is calculated for defined climatic conditions. The water vapor saturation pressure and water vapor partial pressure are determined for the temperatures at the surfaces and separating layers and the course of the water vapor pressure curves over the air layer thickness equivalent to water vapor diffusion is shown graphically. The curves can be used to determine whether and in which area of ​​the component condensation occurs.

It should be noted that the temperature curve within a homogeneous layer is linear, but not the saturated steam pressure. In order to correctly calculate the partial pressure curve for condensation zones, the tangents must therefore be placed on the saturated steam curve. An approximation is permissible within the accuracy of the base values. Condensation heat and evaporation cooling are not taken into account in the current standardization. The same applies to the transport of moisture through sorption. However, some methods take into account the frequency distribution of the outside temperature over the humidification period.

The calculation method and its application are comprehensively explained in the Energy Saving Ordinance.

Norms and standards

  • DIN 4108-3: 2014-11: “Thermal insulation and energy savings in buildings - Part 3: Climate-related moisture protection; Requirements, calculation methods and instructions for planning and execution "
  • ÖNORM B 8110 - Part 2: Water vapor diffusion and condensation protection
  • ENEV 2014 - Energy Saving Ordinance of 2014


  • Peter Lutz: Textbook of Building Physics . Vieweg + Teubner Verlag, Wiesbaden 2002, ISBN 3-519-45014-3 , pp. 393 f .
  • Plant mechanics for sanitary, heating and air conditioning tables Westermann Verlag ISBN 978-3-14-225039-7