Originally Posted by ntertayneme
I think Wilton makes what they call "hidden pillars".. I'm not sure if they have to fit in a cake plate or not .. you may be able to use those .. not sure though .. please post pics of it when you've finish.. can't say I've ever seen a wedding cake in a rectangler shape.. I know it will be beautiful
Yes, I agree that would be an easy way of doing it and that would absolutely be my first choice! These pillars act also as dowels. Hidden pillars are about 6 inches high, they are sort of like hollow tubes but very strong. They are trimmable. They are at there most stable when there is not a lot of them exposed, when they are mostly in the cake with a small space in between them and the next boarded tier above. This is the most popular current design. What you do is make sure your bottom cake that they are sitting in is really well boarded or supported, you would likely use a super strong plastic cake base plate or 1/2 inch to 3/4 inch plywood for your base. Now some folks also board the cake that will sit on the base and others put the cake directly on the covered base. So you take these hidden pillars, usually use 4-6 of them and you push them into the bottom cake until they reach the cake board or cake base. You want to have a good sturdy dense cake when you are doing anything like this. Then your masonite boarded next tier would just sit on the top of these pillars.
If you are going to have a board directly on the bottom cake, then pillars then another board on top of the pillars, you would have to glue the pillars to the in between of the two boards. For this size of cake you should use at least 6. You would also have to dowel the bottom cake to handle this as otherwise the boards and cakes will be sitting on the bottom cake unsupported and sink into the cake and icing and ruin your bottom layer.
Now I know there are likely folks that will tell you to use spiked pillars. These are pillars that are more narrow at the bottom so that they can be stuck into your bottom cake until they reach the board or base this cake sits on. Personally I would steer clear of these like the plague. To use these you need a very deep cake that will give extra support and I wouldn't even attempt it for this application as your cakes are large and will be heavy.
You could still use two separator plates with pillars in between for your smaller top round tier or you could glue pillars in between two masonite boards or whatever.
Hhmn, did that make sense to you/
Hugs Squirrelly Cakes