Represents wall nominal thickness of rectangle. 
   Namespace:   Autodesk.Revit.DB.Structure.StructuralSections  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2018 
Syntax
Remarks
 Nominal is measured real value of profile, should be thicker than designed. In EN standard it is marked as "d". //Need to be verified!!!!!!! In ACI standard it is marked as "d". //Need to be verified!!!!!!!