Abstract
The present paper describes the framework of a practical design method based on frequency of relative humidity within wooden wall assemblies. In this practical design method, moisture resistance ratio across the outer surface of a thermal insulation material is employed as a principle design parameter for the wall assemblies. One of the features of this method is that the design parameter can be calculated without hygrothermal simulations. Instead, two equations regarding the excess frequency of relative humidity are determined by statistical analysis of simulation results of a one-dimensional HAM model developed by authors. As a first step of the research, laboratory experiments using full scale specimens were implemented to validate experimentally the HAM model for this study. Furthermore impact of variability of moisture permeability related to relative humidity was examined for the practical design method.
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