Extrusion roof sketch must be open. The roof's thickness and material composition are defined in its type.

public static FailureDefinitionId ClosedProfileRoof { get; }

Public Shared ReadOnly Property ClosedProfileRoof As FailureDefinitionId
	Get

public:
static property FailureDefinitionId^ ClosedProfileRoof {
	FailureDefinitionId^ get ();
}