Share Email Facebook Twitter LinkedIn PipePressureDropData.Roughness Property The roughness of the pipe. Units: (ft). Namespace: Autodesk.Revit.DB.PlumbingAssembly: RevitAPI (in RevitAPI.dll) Version: 26.4.0.0 (26.4.0.0) Syntax C# public double Roughness { get; }Property ValueDouble See AlsoReferencePipePressureDropData ClassAutodesk.Revit.DB.Plumbing Namespace