Hi,
How many 2" layers can I layer upon each other before the bottom layer will no longer hold? I usually layer 2 - 2" cakes for my regular cakes, but this time I need one side of my cake to have 3 - 2" layers (6+ inches tall). Do I have to have any extra support to ensure that the bottom 2" layer wont crumble? Maybe treat the top layer as a seperate cake with its own board and dowels under to support it? Thoughts, insight please. Thanks a bunch!
You usually want to have support for every 4" of cake, so I would place a cake board under the top layer and also dowel for support. I would just make the board just a little shorter than the actual cake so it doesn't show through the cake design. Good luck! 
The Cake Bible (Rose Levy Beranbaum) suggests using plastic drinking straws instead of dowels. I have done this for wedding cakes and it works very well, and now I use it for everything over three layers. The hollow straw also doesn't compact the surrounding cake, and spaced every 2 -3 inches, holds a cake board very well. It's a lot simpler, easier, and cheaper than using dowels, so you might want to consider trying it.
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