In civil engineering there is an increasing demand for calculation methods to assess the moisture behaviour of building materials and components. Current tasks, such as preserving historical buildings are closely related to the moisture conditions in a building structure. In this context, questions regarding moisture behaviour and the related transport processes occurring under natural climatic conditions as well as the risks thus involved always occur. These questions can either be answered with the help of experiments or by numerical simulations. In view of the fact that experiments are often time-consuming and, in some cases, meteorologically both problematic and expensive, intensive work has been done over the past few years on the development of mathematical approaches and procedures to evaluate real thermal and moisture transfer processes. This paper gives a short summary of the physical fundamentals and shows that calculations performed with different validated computer programs will lead to adequate results. Finally some limitations of the models and possible future developments are shown.

• computer codes for heat-air-moisture transfer : chart on program components
• HAM: theory and modelling : chart on program components
• material properties: hygrothermal : non-isothermal moisture transfer

1. An educational hygrothermal model: WUFI-ORNL/IBP
2. Combined effect of temperature and humidity of the detoriation process of insulation materials in ETICS
3. Determination of moisture and salt content distributions by combining NMR and gamma ray measurements
4. Drying of an AAC flat roof in different climates Computational sensitivity analysis versus material property measurements
5. Moisture buffering effects of interior linings made from wood or wood based products
6. Moisture-buffering effect - experimental investigations and validation
7. Position paper on material characterization and HAM model benchmarking
8. Practical application of an uncertainty approach for hygrothermal building simulations--drying of an AAC flat roof
9. Previous Experimental Studies and Field Measurements on Moisture Buffering by Indoor Surface Materials
10. Simulation of indoor temperature and humidity conditions including hygrothermal interactions with the building envelope
11. Stochastic building envelope modeling -- the influence of material properties
12. The hygrothermal behaviour of rooms: combining thermal building simulation and hygrothermal envelope calculation
13. Two-dimensional transient heat and moisture simulations of rising damp with WUFI 2D
14. Uncertainty approaches for hygrothermal building simulations - drying of an AAC flat roof in different climates
15. Uncertainty of hygrothermal calculations