This does not mean that the traditional prescriptive rules shouild be ignored or that they should be violated without cause. Accordingly, we must look to job specific moisture analysis methods and models for the solution to reduce or eliminate moisture problems in building envelopes.
“The above suggests that the prescriptive rules alone will not assure that building envelopes are free of moisture problems. Trechsel (Hrsg.), ASTM, West Conshohocken, PA, 2001 The comparisons between experiments and simulations have shown that WUFI ® can accurately simulate not only laboratory tests, but also the complex processes in real parts that are exposed to actual weather conditions.ĪSTM International: Moisture Analysis and Condensation Control in Building Envelopes Numerous studies have used the outdoor test area of the Fraunhofer Institute for Building Physics ( to provide well-documented measurements of the hygrothermal behavior of open-air components). For this reason, the validation examples presented below will frequently make use of unpublished experimental results. Unfortunately, open literature has very few experimental studies that meet the above-described conditions for validation. Validation can only be performed when the initial and boundary conditions are well known, the construction of the component is well documented, and all relevant material parameters are available. Partly, there also exist standards, which describe comparing validation cases. This is done by comparing simulation results with analytical results from simple cases or experimental investigations. Before they can be widely used, simulation methods must be validated.