The salt that appears with dampness is the reason why many non-invasive dampness detection methods are ineffective. This requires resorting to invasive methods, which naturally limits the possibilities of performing building diagnostics. The results from these methods are often not available at the time of testing, as they require specialist laboratory tests. Combining the conductometric detection method with the chilled mirror psychrometer would allow for obtaining qualitative data on the state of dampness. These results would be available at the testing site during the inspection of the building. This would provide valuable data for diagnostics, as well as allow for better optimization of other tests in the form of more optimal selection of samples for testing using other research methods. The obtained mutual correlation of both methods at different levels of dampness is a justification for further research.