This paper evaluates the impact of various water-resistive barriers with a large range of vapor permeability on the hygrothermal performance of different wall assemblies. The information enables designers to select products with the most suitable vapor permeability for particular geographical locations and construction conditions. Variations in boundary conditions include climatic conditions (seven climatic locations), cladding type (three-coat stucco, manufactured stone, cement board, brick), and type of WRB (low versus high vapor permeability) deployed. The results for the performance of the wall systems are presented in form of a mold index.
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