I thought CallFromEPConstructionLibrary uses EnergyPlus datasets, which our students are familiar with. But apparently I was mistaken and you are using another library. Can you please briefly inform me,
what material library Honeybee uses,
and if it is possible to access EnergyPlus materials dataset (e.g., ASHRAE_2005_HOF_Materials) from Honeybee.
HB uses the datasets from OpenStudio (Check directory c:\ladybug\OpenStudio, or the default that is set on your machine). But there is also a file, userCustomEPLibrary.idf, in the same location. You can edit this file and include all the datasets that you want.
Very useful file!!