Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
EnergyPlus has a Material:RoofVegetation object that you should look into. I believe that it captures the effective PC properties from wet to dry soil. You'll have to write a measure to use this in OpenStudio. I don't know much about modeling green roofs, but that object looks fairly convincing and easy to use.
