Walls are not showing consistently.

[ndeioma9HYMZ]

Why do these walls show so differently?  Sometimes we see both walls and sometimes they join and become one.  We prefer to see both pieces. It is 2 walls. One existing and a new one that is being attached to the face of the existing.  All help appreciated.

[barthbradley]

Do Walls have a different Base Constraints or is it one Wall Type with Layer Base/Top Extension? 

...can you post the file?  That would make this quick and easy. 

[ndeioma9HYMZ]

It is 2 walls with the same base constraint and slightly different heights. New finish height doesn't go all the way to the deck.  A 20ft wall and a 19ft interior finish wall.

[barthbradley]

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@ndeioma9HYMZ wrote:

It is 2 walls with the same base constraint and slightly different heights. New finish height doesn't go all the way to the deck.  A 20ft wall and a 19ft interior finish wall.

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That's pretty much what I suspected.  Betcha all's good if they are the same; huh?  

[ndeioma9HYMZ]

All of the interior finish walls are different heights, due to avoiding the structure above.  None of the interior walls are the same height as the adjacent walls.  

[ToanDN]

Disjoin and Join geometry again. 

FYI: height/base offset/top offset difference is not an issue unless your cut plane is at the height difference (cut one wall and not the other).  See example below.

[ndeioma9HYMZ]

Tried that.  But it ended up looking exactly the same afterwards. Was worth a shot.