Generic Ceiling Air Gap or Material Type Opaque (no mass)?

I have a doubt: what is the correct way to configure an air gap between the concrete slab and the gypsum ceiling in the ceiling, such as Generic Ceiling Air Gap or creating an opaque material (no mass)?

Hi @isabellapsbarros, there are people on this forum who are qualified to answer this question but since your question is about the best practices for modeling in EnergyPlus it feels like this question is a better fit for a forum like UnmetHours.

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Finally, I did it the same way my coworkers did in OpenStudio: I created an opaque material (no mass) and only modified the RValue [m²K/W] field, according to the parameters of NBR 15220.

Thank you very much for your help!