If a building you need to model is going to have lights and HVAC, then those systems need a plenum space above the ceiling (and possibly below the floor as well). In such cases, how can you find the distance between, say, the ceiling and the slab above? As it turns out, Revit® doesn’t have Real Height parameters for Rooms and Spaces. Instead, it calculates them depending on the actual stretch but not the bounded Height. BIM Tree Manager can help find the distance you’re looking for.
QUESTION: How do you find the distance between a compound ceiling and a slab?
ANSWER: I’d suggest using special spaces to define the volume between a ceiling and slab. Here’s how to do it.