The current grading element has different elevations on bottom faces with existing element, however the cut/fill volume calculation will ignore the bottom faces differences.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.1.0.0 (26.1.0.34)
Syntax
C#
public static FailureDefinitionId GradeRegionElementsIngoreBottom { get; }