The roughness of Duct Lining. 
Namespace: Autodesk.Revit.DB.Mechanical
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since:  2012 
Syntax
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Exceptions
| Exception | Condition | 
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| Autodesk.Revit.ExceptionsArgumentOutOfRangeException | When setting this property: The roughness value should be at least equal to or larger than 0. | 
| Autodesk.Revit.ExceptionsDisabledDisciplineException | When setting this property: None of the following disciplines is enabled: Mechanical Electrical Piping. |