Different results of steam diffusion. Which one is correct?

If I calculate the exterior wall of a post-and-beam construction with WUFI resp. the program Energieeinsparverordnung Wärme-Dampf from Rowa-Soft, I get very different results. With WUFI, the total water content in the component decreases significantly (which is therefore okay), with the program from Rowa-Soft the vapor diffusion is not fulfilled. Which result is more likely? )Bau ist 33 Jahre alt und hat nirgends Dampfbremsen).

Hello Truk,

unfortunately, I am not familiar with the two programs you used for the calculations.

The programs for the Energy Saving Ordinance all seem to be not quite mature yet. But it is also an extremely complex area.

In the October 08 issue (Issue 10) of the Deutsches IngenieurBlatt, the test results of 6 programs for the Energy Saving Ordinance (all professional software) were presented. All programs were tested on the same building with the same inputs, yet 6 different results were obtained.
This means that none of the results necessarily has to be a correct result. Software for calculation according to the Energy Saving Ordinance is therefore currently not yet reliable.
This might not necessarily help you, but perhaps explains the different results.

Best regards from the Osnabrück region