The roughness of the section.
Namespace: Autodesk.Revit.DB.Mechanical
Assembly: RevitAPI (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0)
Since: 2013
Syntax
Remarks
In one section, all section members have same roughness. Default unit is Decimal feet. For Duct, unit type is UT_HVAC_Roughness. For Pipe, unit type is UT_Piping_Roughness