The first thing that should be done is create three text project parameters for floors, walls and ceilings. The value of these three parameters will be filled by extracting the information contained in the the material parameters of the bounding elements of rooms. The reason to do this is because the material parameters cannot be reported in schedules and the properties menu of rooms because they are not text parameters. These text project parameters will also appear in the Room Parameters window in the Room Finishes menu the next time that the Room Finishes tool is opened. If the finish material of a bounding surface is modified, the value of the text parameters will not be updated, as it is necessary to run again the Room Finishes plugin. This is because Room Finishes does not link the material parameters to the text parameters.
To create a new text project parameter for floors for example, in Revit go to Manage and then click on Project Parameters. Once inside click on Add. Then follow these steps:
Once you have done this for the floors remember to also do it for walls and ceilings if you intend to include that information in your schedules.