Creating Stacked Walls
A stacked wall, simply put, is a wall created by stacking two premade walls together. You can't have a stacked wall without at least two basic walls that you can join together. The good thing about stacked walls is that you can stack as many as you like. I recommend that you use some restraint, though—these walls can start to use up memory if you get too carried away.
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Although it's true that a stacked wall is basically the only good way to create a wall system with an offset face, stacked walls are notoriously bad in terms of hosting items and joining to other walls. In addition, one of the biggest drawbacks of a stacked wall is the fact that it doesn't appear in a wall schedule—only ...