I have created a mass with multiple material layers in Revit then I imported the mass to VASARI, and it worked out. But the question is : Is VASARI going to use REVIT skin or default mass skin which is the surfce of the mass ?
Vasari will use "conceptual constructions" assigned to the energy model which is formed from the Mass. Multi-layer walls in Revit will have no effect on the conceptual energy model. That said, Revit now does have capabilities to do energy analysis based on layered walls. See energy analysis in Revit.