Thermal conductivity in relation to moisture

Hello everybody,

I am new to Dynamo and would like to ask for help for a University project. The main idea is to create a digital twin of an old heritage building in Venice to monitor the influences of the flooding. Therefore I would like to show the relation between moisture in masonry and the thermal conductivity. It would be nice to have a slider which would represent the changing moisture and take influence on the thermal conductivity.
Though I am just able to list the thermal conductivity of the materials at the moment and don´t know where to go now. Is it even possible to create a relation since the thermal conductivity is a given value in Revit?
I would really appreciate some help.
This is what I have so far: