Our Da Lite screen models are meant to be hosted in what's known in Revit as a Compound Ceiling family.  Unlike the Generic Ceiling object, a Compound Ceiling family
allows the architect to adjust the structure (adding/removing layers, assigning materials to each of those layers and so on).  Based on this functionality, Revit can create
ceiling schedules and material takeoffs when an architect starts the process of producing their CDs.  In contrast, Generic Ceilings in Revit actually do not have any structure,
they are basically just a face that can have materials associated it.  So creating schedule and material take offs are very limited as they will not contain a thickness element,
and therefore all the corresponding volume calculations will not be available.

Lastly, another limitation due to the lack of "structure" in Generic Ceilings is the behavior with the "void" object in Revit.  Voids will cut geometry easily, but as
the Generic Ceiling is represented only by a face - it cannot cut this object although it doesn't have this problem with Compound Ceilings.  Many Da Lite models feature voids
to accurately portray the geometry of our products.  For this reason as well, we encourage the use of Compound Ceilings as opposed to Generic ones.

In summary, we encourage architects to only utilize Compound Ceiling system families to produce their buildings and our Da Lite Revit models are modeled to work in conjunction
with these families.