I am making a cake that is 4 tiers. The bottom 2 tiers will be foam. How do I construct this? Do I need to force dowell rods for stability? It seems like the foam should keep the other cake from sinking, but I have never made a cake like this before. I need help from the masters...thats why I am soliciting you! Thanks!!!

(PS: Bottom 2 tiers are square, top 2 tiers are circle)

That's the greatest thing about dummy tiers....no doweling. I did this one with two tiers of styrofoam. You will only need to support the top tier.

i would recommend that you glue the bottom foam dummy to the board with hot glue or someother type of glue, and then put atleast two popsicle sticks into the third and bottom tier, to keep them stable and prevent them from sliding...