Personally I use the start point and end point from the location curve (endpoints 0 and 1) then calculate my own direction. As for side, that is outside, check the justification of the wall and the flip settings found in the parameter set. From there you can determine if its 'brick' or whatever, is on a particular side.
Dim dblDirection As Double = Math.Atan2(p2.Y - p1.Y, p2.X - p1.X)
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