Double skin façade_bsdf materials

Hi I have a question about modelling a double skin façade with a cavity in Rhino, for daylight simulations. Should I use a bsdf material for the whole component? What would be the best way to simulate what will happen in the cavity between the outer layer of glazing and the inner one? Thanks Julie

Seems this question is languishing. I would suggest adding further detail about your configuration and what resources you have available. Do you have a BSDF for the combined system, or were you planning to generate one? Are you doing annual simulations or point-in-time calculations (or both)? What is your end goal?