I'm still new to cake stacking. All of the stacked caked that I've made so far are tiered cakes. If i'm stacking several cakes that are all single layer but different sizes do I still need to use dowel rods for support?

I do but I use 1/2 the amount I would for a double layer.
So if it's a 6", 8" and 10" I dowel the 10" with 4 instead of 8 and the 8 with 3 dowels instead of 6.
I don't know if that's the right way but it has always worked for me.

If I understand you correclty, you're going to stack, for example, a 6" layer on top of a a 10" layer on top of a 14" layer?? Is each layer 2 inches tall, so the entire cake is, say, 6 inches tall??

If it's very dense cake or has a lot of filling, I'd support the 6" layer (put it on it's own board and a few dowels in the 10" under it), but other than that, no, I wouldn't see the need for any other supports.

Rae

Yes you understood me correctly. I want to stack a 14, 10 and 6 but just single layers with a thin layer of frosting between. Thanks for the advice ladies!

If the cake won't be traveling far, I don't even bother to dowel 3 tier singles. No disasters yet and I live in the Appalachian Mountain region with lots of curvy roads. Here's one I did almost the same sizes as you are doing and it survived with no issues.

http://cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1523163

That cake is amazing!

Thanks TYA... your 1st basket weave & castle cake are both really impressive.