I want to analyze a building with significantly different material properties between the first and second floors (i.e. solid concrete vs. wood framing). Is it necessary for wall material information to be accurate in Revit before I export the gbXML file? Other than volume, what other parameters need to be set in Revit for an effective energy analysis?
It is not necessary for your wall constructions to be detailed in order to get useful energy analysis results with your Revit model. Your model can be conceptual. All that is needed for a reasonable energy result are the model itself( geometry, etc.,), buidling type, and location. The other parameters are automatically assigned, based upon reasonable defaults for new constructions by using ASHRAE baseline standards and other references. See this blog posting for more details. Default Inputs for Revit and Vasari Energy Analysis
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