Custom Mass Opaque Material with R Value

Hi Mostapha, Chris and group members,

If I want to custom a mass opaque material, is it possible to set up with R value?

The help of Honeybee_EnergyPlus Nomass Opaque Material writes,  "However, this component is very useful if you only have an R-value for a material (or a construction) and you know that the mass is relatively small. _ If you want to create a material that accounts for mass, you should use the "Honeybee_EnergyPlus Window Material" component".

Is it possible, or my misunderstand?

Thank you in advance.