The highlighted wall(s) cannot be joined to the highlighted roof because the roof does not entirely cover the wall(s).

public static FailureDefinitionId WallNotCoveredByRoof { get; }

Public Shared ReadOnly Property WallNotCoveredByRoof As FailureDefinitionId
	Get

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