Question-and-Answer Resource for the Building Energy Modeling Community
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This answer is probably too late, however I have just encountered and solved a similart issue.
Are you using the advanced moisture modelling algorithmns in the HeatBalanceAlgorithm Object?
I had the same problem, because my materials were not absorbing and then releasing water. It is called buffering. The easiest way is to use the EMPD Effective Moisture Penetration Depth model. EP8.6 as just had these significantly improved, and NREL and Oak Ridge have been very active in this area the last two years.
